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ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 123
ENARDO Flame ArrestorsENARDO Flame Arrestors
0 1 2 3 4 5 6 7 8 9 10 11 120
5
10
15
20
25
300 1 2 3 4 5 6 7 8 9 10 11 12
Vent Stack Arrestor
Group D Gases
25 mm (1 in.) Connections
8801/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 1-14-04SFC0950A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
Model 8800 Vent Stack Flame ArrestorPressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com124
0 5 10 15 20 250
5
10
15
20
25
300 5 10 15 20 25
Group D Gases
50 mm (2 in.) Connections
8802/DVent Stack Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 12-10-99FC0179A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Model 8800 Vent Stack Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 125
ENARDO Flame ArrestorsENARDO Flame ArrestorsModel 8800 Vent Stack Flame Arrestor
Pressure Drop Curves
0 5 10 15 20 25 30 35 40 45 500
5
10
15
20
25
300 5 10 15 20 25 30 35 40 45 50
Vent Stack Arrestor
Group D Gases
80 mm (3 in.) Connections
8803/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 10-24-00SFC0488A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com126
0 10 20 30 40 50 60 70 80 90 1000
5
10
15
20
25
300 10 20 30 40 50 60 70 80 90 100
Group D Gases
100 mm (4 in.) Connections
8804/DVent Stack Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 2-8-00FC0185A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Model 8800 Vent Stack Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 127
ENARDO Flame ArrestorsENARDO Flame ArrestorsModel 8800 Vent Stack Flame Arrestor
Pressure Drop Curves
0 50 100 150 200 2500
5
10
15
20
25
300 50 100 150 200 250
Group D Gases
150 mm (6 in.) Connections
8806/DVent Stack Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 2-4-00FC0183A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com128
0 1 2 3 4 5 6 7 8 9 10 11 120
5
10
15
20
25
300 1 2 3 4 5 6 7 8 9 10 11 12
Vent Stack Arrestor
Group D Gases
25 mm (1 in.) Connections
9901/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 7-31-01SFC0569A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Model 9900 Vent Stack Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 129
ENARDO Flame ArrestorsENARDO Flame ArrestorsModel 9900 Vent Stack Flame Arrestor
Pressure Drop Curves
0 5 10 15 20 250
5
10
15
20
25
300 5 10 15 20 25
Group D Gases
50 mm (2 in.) Connections
9902/DVent Stack Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 12-13-99FC0180A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com130
0 10 20 30 40 500
5
10
15
20
25
300 10 20 30 40 50
Group D Gases
80 mm (3 in.) Connections
9903/DVent Stack Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 2-15-00FC0186A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Model 9900 Vent Stack Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 131
ENARDO Flame ArrestorsENARDO Flame ArrestorsModel 9900 Vent Stack Flame Arrestor
Pressure Drop Curves
0 10 20 30 40 50 60 70 80 900
5
10
15
20
25
300 10 20 30 40 50 60 70 80 90
Group D Gases
100 mm (4 in.) Connections
9904/DVent Stack Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 2-7-00FC0184A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com132
0 20 40 60 80 100 120 140 160 180 200 2200
5
10
15
20
25
300 20 40 60 80 100 120 140 160 180 200 220
Vent Stack Arrestor
Group D Gases
150 mm (6 in.) Connections
9906/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 8-3-01SFC0575A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Model 9900 Vent Stack Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 133
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Free Vent Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0
402/IIA-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-9-03FC0333A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Free Vent Flame Arrestor 50 mm (2 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com134
0.0 0.5 1.0 1.5 2.0 2.5 3.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0
603/IIA-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0332A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Free Vent Flame Arrestor 80 mm (3 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Free Vent Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 135
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Free Vent Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
804/IIA-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0327A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Free Vent Flame Arrestor 100 mm (4 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com136
0 1 2 3 4 5 6 7 80
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 1 2 3 4 5 6 7 8
1206/IIA-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0328A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Free Vent Flame Arrestor 150 mm (6 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Free Vent Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 137
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Free Vent Flame Arrestor
Pressure Drop Curves
0 2 4 6 8 10 12 140
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 2 4 6 8 10 12 14
1608/IIA-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0329A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Free Vent Flame Arrestor 200 mm (8 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com138
0 5 10 15 20 250
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 5 10 15 20 25
2010/IIA-FVFA \ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0330A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Free Vent Flame Arrestor 250 mm (10 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Free Vent Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 139
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Free Vent Flame Arrestor
Pressure Drop Curves
0 5 10 15 20 250
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 5 10 15 20 25
2412/IIA-FVFA ATEX Approved EN 12874
Pre
ssur
e D
rop
(mba
r)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0331A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Free Vent Flame Arrestor 300 mm (12 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com140
0.00 0.05 0.10 0.15 0.20 0.25 0.300
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.00 0.05 0.10 0.15 0.20 0.25 0.30
EN- 402/IIB3-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0355A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Free Vent Flame Arrestor 50 mm (2 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Free Vent Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 141
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Free Vent Flame Arrestor
Pressure Drop Curves
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.70
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
EN-603/IIB3-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-6-04FC0356A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Free Vent Flame Arrestor 80 mm (3 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com142
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.30
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
EN- 804/IIB3-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0357A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Free Vent Flame Arrestor 100 mm (4 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Free Vent Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 143
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Free Vent Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
EN-1206/IIB3-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-9-04FC0358A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Free Vent Flame Arrestor 150 mm (6 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com144
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
EN-1608/IIB3-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0359A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Free Vent Flame Arrestor 200 mm (8 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Free Vent Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 145
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Free Vent Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
EN-2010/IIB3-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0360A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Free Vent Flame Arrestor 250 mm (10 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com146
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
EN-2412/IIB3-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0361A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Free Vent Flame Arrestor 300 mm (12 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Free Vent Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 147
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Series 7 Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5
EN-70402/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0326A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Series 7 Flame Arrestor 50 mm (2 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com148
0.0 0.5 1.0 1.5 2.0 2.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5
EN-70603/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0325A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Series 7 Flame Arrestor 80 mm (3 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Series 7 Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 149
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Series 7 Flame Arrestor
Pressure Drop Curves
0 1 2 30
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 1 2 3
EN-70804/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0322A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Series 7 Flame Arrestor 100 mm (4 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com150
0 1 2 3 4 5 6 70
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 1 2 3 4 5 6 7
EN-71206/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 11-21-03FC0320A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Series 7 Flame Arrestor 150 mm (6 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Series 7 Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 151
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Series 7 Flame Arrestor
Pressure Drop Curves
0 1 2 3 4 5 6 7 8 9 10 11 12 130
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 1 2 3 4 5 6 7 8 9 10 11 12 13
EN-71608/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0323A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Series 7 Flame Arrestor 200 mm (8 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com152
0 5 10 15 200
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 5 10 15 20
EN-72010/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 11-21-03FC0321A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Series 7 Flame Arrestor 250 mm (10 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Series 7 Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 153
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Series 7 Flame Arrestor
Pressure Drop Curves
0 2 4 6 8 10 12 14 16 18 20 22 240
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 2 4 6 8 10 12 14 16 18 20 22 24
EN-72412/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-2-03FC0324A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Series 7 Flame Arrestor 300 mm (12 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com154
0 10 20 30 40 50 60 70 80 90 1000
5
10
15
20
25
300 10 20 30 40 50 60 70 80 90 100
Flame Arrestor 50 mm (2 in.), 80 mm (3 in.), and100 mm (4in.) End Connections
Series 7 - 70802/D, 70803/D, 70804/D For Group "D" GasesP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
70804/D4" Size
70803/D3" Size
70802/D2" Size
rev. A 9-23-98SFC0104A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Series 7 Flame Arrestor
Standard Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 155
ENARDO Flame ArrestorsENARDO Flame ArrestorsSeries 7 Flame Arrestor
Standard Pressure Drop Curves
0 50 100 150 200 250 300 350 400 450 5000
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450 500
For Group "D" Gases
Flame Arrestor 150 mm (6 in.) and 200 mm (8 in.) End Connections
Series 7 - 71006/D, 71206/D, 71408D, 71608/D
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
71608/D8" Size
71408/D8" Size
71206/D6" Size
71006/D6" Size
rev. A 9-1-98SFC0132A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com156
0 100 200 300 400 500 600 700 8000
5
10
15
20
25
300 100 200 300 400 500 600 700 800
For Group "D" GasesFlame Arrestor 250 mm (10 in.) End Connections Series 7 - 72010/D
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 9-23-98SFC0110A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Series 7 Flame Arrestor
Standard Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 157
ENARDO Flame ArrestorsENARDO Flame ArrestorsSeries 7 Flame Arrestor
Standard Pressure Drop Curves
0 100 200 300 400 500 600 700 800 9000
5
10
15
20
25
300 100 200 300 400 500 600 700 800 900
For Group D Gases
300 mm (12 in.) Connections
Series 7 - 72412/DFlame Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 7-20-99FC0177A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com158
0.00 0.05 0.10 0.15 0.20 0.25 0.300
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.00 0.05 0.10 0.15 0.20 0.25 0.30
EN-70402/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0348A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Series 7 Flame Arrestor 50 mm (2 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Series 7 Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 159
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Series 7 Flame Arrestor
Pressure Drop Curves
0.0 0.1 0.2 0.3 0.4 0.5 0.60
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.1 0.2 0.3 0.4 0.5 0.6
EN-70603/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-6-04FC0349A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Series 7 Flame Arrestor 80 mm (3 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com160
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.20
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
EN-70804/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0350A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Series 7 Flame Arrestor 100 mm (4 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Series 7 Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 161
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Series 7 Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.0 2.5 3.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0
EN-71206/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-9-04FC0351A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Series 7 Flame Arrestor 150 mm (6 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com162
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
EN-71608/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0352A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Series 7 Flame Arrestor 200 mm (8 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Series 7 Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 163
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Series 7 Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
EN-72010/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0353A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Series 7 Flame Arrestor 250 mm (10 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com164
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
EN-72412/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0354A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Series 7 Flame Arrestor 300 mm (12 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Series 7 Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 165
ENARDO Flame ArrestorsENARDO Flame ArrestorsSeries 8 High Pressure Deflagration
Flame Arrestor Pressure Drop Curves
0 5 10 15 200
5
10
15
20
25
300 5 10 15 20
50 mm (2 in.) ConnectionsSeries 8 - 80802/D Deflagration Flame Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 10-29-98SFC0135A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com166
0 5 10 15 20 25 30 35 400
5
10
15
20
25
300 5 10 15 20 25 30 35 40
80 mm (3 in.) Connections
Series 8 - 80803/D Deflagration Flame Arrestor
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 2-9-00SFC0365A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Series 8 High Pressure Deflagration
Flame Arrestor Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 167
ENARDO Flame ArrestorsENARDO Flame ArrestorsSeries 8 High Pressure Deflagration
Flame Arrestor Pressure Drop Curves
0 20 40 60 80 100 120 140 1600
5
10
15
20
25
300 20 40 60 80 100 120 140 160
81608/D8" size
81206/D6" size
80804/D4" size
Deflagration Flame Arrestor 100 mm (4 im.), 150 mm (6 in.) and 200 mm (8 in.) End Connections
Series 8 - 80804/D, 81206/D, 81608/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 3-9-99SFC0204A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com168
0 50 100 150 200 250 300 3500
5
10
15
20
25
300 50 100 150 200 250 300 350
82412/D12" size
82010/D10" size
Deflagration Flame Arrestor
250 mm (10 in.) and 300 mm (12 in.)
End Connections
Series 8 - 82010/D, 82412/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 3-9-99SFC0205A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Series 8 High Pressure Deflagration
Flame Arrestor Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 169
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Detonation Flame Arrestor
Pressure Drop Curves
0.00 0.05 0.10 0.15 0.20 0.250
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.00 0.05 0.10 0.15 0.20 0.25
EN-DFA- 402/IIA ATEX Approved EN 12874 Group IIA Gases
Detonation Flame Arrestor 50 mm (2 in.) End ConnectionP
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-29-03FC0334A
Pre
ssur
e D
rop
(kP
a)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com170
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.90
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
EN-DFA- 603/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0335A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Detonation Flame Arrestor 80 mm (3 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Detonation Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 171
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Detonation Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5
EN-DFA- 804/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0336A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Detonation Flame Arrestor 100 mm (4 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com172
0.0 0.5 1.0 1.5 2.0 2.5 3.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0
EN-DFA-1206/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-29-03FC0337A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Detonation Flame Arrestor 150 mm (6 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Detonation Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 173
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Detonation Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
EN-1608/IIB3-FVFA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 1-16-04FC0359A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Free Vent Flame Arrestor 200 mm (8 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com174
0 1 2 3 4 5 6 7 80
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 1 2 3 4 5 6 7 8
EN-DFA-2010/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-29-03FC0339A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Detonation Flame Arrestor 250 mm (10 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Detonation Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 175
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Detonation Flame Arrestor
Pressure Drop Curves
0 1 2 3 4 5 6 7 8 9 10 11 120
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850 1 2 3 4 5 6 7 8 9 10 11 12
EN-DFA-2412/IIA ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-29-03FC0340A
Pre
ssur
e D
rop
(kP
a)
Group IIA Gases
Detonation Flame Arrestor 300 mm (12 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com176
0 5 10 15 20 25 30 35 40 450
5
10
15
20
25
300 5 10 15 20 25 30 35 40 45
DFA 803/D 3" size
DFA 602/D 2" size
Detonation Flame Arrestor 50 mm (2 in.) and 80 mm (3 in.)End Connections
DFA - 602/D, 803/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 3-9-99SFC0206A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Detonation Flame Arrestor
Standard Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 177
ENARDO Flame ArrestorsENARDO Flame ArrestorsDetonation Flame Arrestor
Standard Pressure Drop Curves
0 20 40 60 80 100 1200
5
10
15
20
25
300 20 40 60 80 100 120
DFA 1206/D 6" size
DFA 1004/D 4" size
Detonation Flame Arrestor 100 mm (4 in.) and 150 mm (6 in.)End Connections
DFA 1004/D, 1206/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 3-9-99SFC0207A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com178
0 50 100 150 200 250 3000
5
10
15
20
25
300 50 100 150 200 250 300
DFA 2010/D 10" size
DFA 1608/D 8" size
Detonation Flame Arrestor 200 mm (8 in.) and 250 mm (10 in.)End Connections
DFA - 1608/D, 2010/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 3-9-99SFC0208A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO Flame ArrestorsENARDO Flame Arrestors Detonation Flame Arrestor
Standard Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 179
ENARDO Flame ArrestorsENARDO Flame ArrestorsDetonation Flame Arrestor
Standard Pressure Drop Curves
0 50 100 150 200 250 300 350 400 450 5000
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450 500
DFA 3016/D 16" size
DFA 2412/D 12" size
Detonation Flame Arrestor 300 mm (12 in.) and 400 mm (16 in.)End Connections
DFA - 2412/D, 3016/DP
ress
ure
Dro
p (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 9-26-97SFC0209A
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com180
0.00 0.05 0.10 0.150
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.00 0.05 0.10 0.15
EN-DFA- 402/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0341A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Detonation Flame Arrestor 50 mm (2 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Detonation Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 181
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Detonation Flame Arrestor
Pressure Drop Curves
0.0 0.1 0.2 0.3 0.4 0.5 0.60
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.1 0.2 0.3 0.4 0.5 0.6
EN-DFA- 603/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0342A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Detonation Flame Arrestor 80 mm (3 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com182
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.90
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
EN-DFA- 804/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0343A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Detonation Flame Arrestor 100 mm (4 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Detonation Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 183
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Detonation Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0
EN-DFA-1206/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0344A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Detonation Flame Arrestor 150 mm (6 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com184
0.0 0.5 1.0 1.5 2.0 2.5 3.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0
EN-DFA-1608/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0345A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Detonation Flame Arrestor 200 mm (8 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Detonation Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 185
ENARDO Flame ArrestorsENARDO Flame ArrestorsEN Model Detonation Flame Arrestor
Pressure Drop Curves
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.50
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
EN-DFA-2010/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0346A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Detonation Flame Arrestor 250 mm (10 in.) End Connection
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com186
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.00
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
850.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
EN-DFA-2412/IIB3 ATEX Approved EN 12874 P
ress
ure
Dro
p (m
bar)
Air Flow (1000's Nm^3/hr)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
Rev. A 12-30-03FC0347A
Pre
ssur
e D
rop
(kP
a)
Group IIB3 Gases
Detonation Flame Arrestor 300 mm (12 in.) End Connection
ENARDO Flame ArrestorsENARDO Flame Arrestors EN Model Detonation Flame Arrestor
Pressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 187
Model 800 In-line Vent ValvePressure Drop Curves
0 1 2 3 4 5 6 7 8 90
5
10
15
20
25
300 1 2 3 4 5 6 7 8 9
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0043A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
PRESSUREModel 820-PSO In-Line Vent Valve 50 mm (2 in.) End Connections
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com188
0 1 2 3 4 5 6 7 8 9 10 110
5
10
15
20
25
300 1 2 3 4 5 6 7 8 9 10 11
8.0 oz. setting
4.0 oz. se
tting
2.0 oz. se
tting
1.0 oz. se
tting
0.5 oz. se
tting
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0040A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
50 mm (2 in.) End Connections
PRESSUREModel 820-SO
In-Line Vent Valve
Model 800 In-line Vent ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 189
Model 800 In-line Vent ValvePressure Drop Curves
0 1 2 3 4 5 6 7-30
-25
-20
-15
-10
-5
00 1 2 3 4 5 6 7
0.4 oz. setting
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0049A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
50 mm (2 in.) End Connections
VACUUMModel 820-SO In-Line Vent Valve
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com190
0 2 4 6 8 10 12 14 16 180
5
10
15
20
25
300 2 4 6 8 10 12 14 16 18
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0044A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
80 mm (3 in.) End Connections
PRESSUREModel 830-PSO In-Line Vent Valve
Model 800 In-line Vent ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 191
Model 800 In-line Vent ValvePressure Drop Curves
0 5 10 15 20 250
5
10
15
20
25
300 5 10 15 20 25
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
.5 oz. se
tting
rev. A 6-17-97FC0041A
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
80 mm (3 in.) End Connections
PRESSUREModel 830-SO In-Line Vent Valve
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com192
0 2 4 6 8 10 12 14 16-30
-25
-20
-15
-10
-5
00 2 4 6 8 10 12 14 16
0.4 oz. setting
VACUUMModel 830-SOIn-Line Vent Valve
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
80 mm (3 in.) End Connections
rev. A 6-17-97FC0050A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 800 In-line Vent ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 193
Model 800 In-line Vent ValvePressure Drop Curves
0 5 10 15 20 25 30 350
5
10
15
20
25
300 5 10 15 20 25 30 35
rev. A 6-17-97FC0045A
PRESSUREModel 840-PSOIn-Line Vent Valve
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
100 mm (4 in.) End Connections
8.0 oz. se
tting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com194
0 5 10 15 20 25 30 350
5
10
15
20
25
300 5 10 15 20 25 30 35
PRESSUREModel 840-SO
In-Line Vent Valve
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
100 mm (4 in.) End Connections
8.0
oz. s
ettin
g
4.0 oz
. sett
ing
2.0 oz. se
tting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0042A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 800 In-line Vent ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 195
Model 800 In-line Vent ValvePressure Drop Curves
0 5 10 15 20 25 30-30
-25
-20
-15
-10
-5
00 5 10 15 20 25 30
0.4 oz. setting
VACUUMModel 840-SO
In-Line Vent ValveT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
100 mm (4 in.) End Connections
rev. A 6-17-97FC0051A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com196
0 1 2 3 4 5 6 7 8 9 10 11 120
5
10
15
20
25
300 1 2 3 4 5 6 7 8 9 10 11 12
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
PRESSUREModel 920-SOStack Vent Valve
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
50 mm (2 in.) End Connections
rev. A 6-17-97FC0046A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 900 End of Line Stack Vent ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 197
Model 900 End of Line Stack Vent ValvePressure Drop Curves
0 1 2 3 4 5 6 7 8 9 10 11-30
-25
-20
-15
-10
-5
00 1 2 3 4 5 6 7 8 9 10 11
VACUUMModel 920-SOStack Vent Valve
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
50 mm (2 in.) End Connections
0.4 oz. setting
rev. A 6-17-97FC0052A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com198
0 2 4 6 8 10 12 14 16 18 200
5
10
15
20
25
300 2 4 6 8 10 12 14 16 18 20
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
PRESSUREModel 930-SOStack Vent Valve
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
80 mm (3 in.) End Connections
rev. A 6-17-97FC0047A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 900 End of Line Stack Vent ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 199
Model 900 End of Line Stack Vent ValvePressure Drop Curves
0 2 4 6 8 10 12 14 16-30
-25
-20
-15
-10
-5
00 2 4 6 8 10 12 14 16
0.4 oz. setting
VACUUMModel 930-SO
Stack Vent ValveT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
80 mm (3 in.) End Connections
rev. A 6-17-97FC0053A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com200
0 5 10 15 20 25 300
5
10
15
20
25
300 5 10 15 20 25 30
100 mm (4 in.) End Connections
2.0 oz. setting
1.0 oz. setting
8.0 oz. setting
4.0 oz. setting
0.5 oz. setting
PRESSUREModel 940-SO
Stack Vent Valve
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0048A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 900 End of Line Stack Vent ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 201
Model 900 End of Line Stack Vent ValvePressure Drop Curves
0 5 10 15 20 25 30 35-30
-25
-20
-15
-10
-5
00 5 10 15 20 25 30 35
VACUUMModel 940-SO
Stack Vent ValveT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
100 mm (4 in.) End Connections
0.4 oz. setting
rev. A 6-17-97FC0054A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com202
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0
1
2
3
4
5
6
7
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
1/2 oz
1 oz.
2 oz.
4 oz.
8 oz.
PRESSURESeries 450-2X3 PVRV Pipe AwayPressure/Vacuum Relief Valve 50 mm (2 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 12-11-02FC0300A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 203
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0.0 0.1 0.2 0.3 0.4
-7
-6
-5
-4
-3
-2
-1
0
0.0 0.1 0.2 0.3 0.4
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 450-PVRV Pressure/Vacuum Relief Valve 50 mm (2 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. A 4-20-03FC0274
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com204
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
0
1
2
3
4
5
6
7
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
1/2 oz
1 oz.
2 oz.
4 oz.
8 oz.
PRESSURESeries 450-3x4 PVRV Pipe AwayPressure/Vacuum Relief Valve 80 mm (3 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 12-11-02FC0302A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 205
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
-7
-6
-5
-4
-3
-2
-1
0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 450-PVRV Pressure/Vacuum Relief Valve 80 mm(3 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-18-03FC0278B
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com206
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
0
1
2
3
4
5
6
7
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8
1/2 oz
1 oz.
2 oz.
4 oz.
8 oz.
PRESSURESeries 450-4x6 PVRV Pipe AwayPressure/Vacuum Relief Valve 100 mm (4 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 12-11-02FC0304A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 207
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
-7
-6
-5
-4
-3
-2
-1
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 450-PVRV Pressure/Vacuum Relief Valve 100 mm (4 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-18-03FC0282B
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com208
0 1 2 3 4 5
0
1
2
3
4
5
6
7
0 1 2 3 4 5
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
PRESSURESeries 450-6x8 PVRV Pipe AwayPressure/Vacuum Relief Valve 150 mm (6 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0306A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 209
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
-7
-6
-5
-4
-3
-2
-1
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 450-PVRV Pressure/Vacuum Relief Valve 150 mm (6 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-18-03FC0286B
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com210
0 1 2 3 4 5 6 7 8 9
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7 8 9
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
PRESSURESeries 450-8x10 PVRV Pipe AwayPressure/Vacuum Relief Valve 200 mm (8 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0308A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 211
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0 1 2 3 4 5 6 7 8 9
-7
-6
-5
-4
-3
-2
-1
0
0 1 2 3 4 5 6 7 8 9
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 450-PVRV Pressure/Vacuum Relief Valve 200 mm (8 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-23-03FC0290b
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com212
0 1 2 3 4 5 6 7 8 9 10 11 12 13
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7 8 9 10 11 12 13
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
PRESSURESeries 450-10X12 PVRV Pipe AwayPressure/Vacuum Relief Valve 250 mm (10 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0310A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 213
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0 1 2 3 4 5 6 7 8 9 10 11
-7
-6
-5
-4
-3
-2
-1
0
0 1 2 3 4 5 6 7 8 9 10 11
4 oz.
2 oz.
1 oz.1/2 oz.
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. A 4-20-03FC0294
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet Connection
VACUUMSeries 450
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com214
0 5 10 15
0
1
2
3
4
5
6
7
0 5 10 15
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
PRESSURESeries 450-12x14 PVRV Pipe AwayPressure/Vacuum Relief Valve 300 mm (12 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0312A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 215
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0 1 2 3 4 5 6 7 8 9 10 11 12 13
-7
-6
-5
-4
-3
-2
-1
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
4 oz.
2 oz.
1 oz.
1/2 oz.
VACUUMSeries 450-PVRV Pressure/Vacuum Relief Valve 300 mm(12 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. A 4-20-03FC0298
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com216
0 5 10 15 20 25 300
5
10
15
20
25
300 5 10 15 20 25 30
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet ConnectionPRESSURESeries 450
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 12-11-02FC0299A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 217
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 1 2 3 4 5 6 7 8 9 10 11 12 13-30
-25
-20
-15
-10
-5
00 1 2 3 4 5 6 7 8 9 10 11 12 13
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0272
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com218
0 5 10 15 20 25 30 35 40 45 50 55 600
5
10
15
20
25
300 5 10 15 20 25 30 35 40 45 50 55 60
8.0 oz. setting
1.0 oz. setting2.0 oz. setting
4.0 oz. setting
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
0.5 oz. setting
PRESSURESeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 12-11-02FC0301A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 219
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 5 10 15 20 25-30
-25
-20
-15
-10
-5
00 5 10 15 20 25
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0276A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com220
0 10 20 30 40 50 60 70 80 90 1000
5
10
15
20
25
300 10 20 30 40 50 60 70 80 90 100
Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet Connection
1/2 oz1 oz.
2 oz.
4 oz.
8 oz.
PRESSURESeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 12-11-02FC0303A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 221
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 5 10 15 20 25 30 35 40-30
-25
-20
-15
-10
-5
00 5 10 15 20 25 30 35 40
100 mm (4 in.) Inlet ConnectionPressure/Vacuum Relief ValveVACUUMSeries 450
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Rev. A 4-20-03FC0280A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com222
0 50 100 150 2000
5
10
15
20
25
300 50 100 150 200
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
PRESSURESeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FC0305A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 223
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 10 20 30 40 50 60 70 80 90 100 110-30
-25
-20
-15
-10
-5
00 10 20 30 40 50 60 70 80 90 100 110
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0284a
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com224
0 50 100 150 200 250 3000
5
10
15
20
25
300 50 100 150 200 250 300
Pressure/Vacuum Relief Valve 200 mm (8 in.) Inlet Connection
PRESSURESeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Rev. A 4-16-03FC0307A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 225
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 50 100 150 200 250 300-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300
Pressure/Vacuum Relief Valve 200 mm (8 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0288a
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com226
0 100 200 300 400 5000
5
10
15
20
25
300 100 200 300 400 500
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. se
tting
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet Connection
PRESSURESeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FC0309A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 227
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 50 100 150 200 250 300 350 400-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300 350 400
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0292a
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com228
0 50 100 150 200 250 300 350 400 450 5000
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450 500
2.0 oz. setting
8.0 oz. setting
4.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Pressure/Vacuum Relief Valve 300 mm (12 in.) Inlet ConnectionPRESSURESeries 450
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FC0311A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 229
Model 450 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 50 100 150 200 250 300 350 400 450-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300 350 400 450
Pressure/Vacuum Relief Valve 300 mm (12 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 450T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03Fc0296a
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com230
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0
1
2
3
4
5
6
7
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
PRESSURESeries 550-PVRV Vent to AtmospherePressure/Vacuum Relief Valve 50 mm (2 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0260A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 231
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0.0 0.1 0.2 0.3 0.4
-7
-6
-5
-4
-3
-2
-1
0
0.0 0.1 0.2 0.3 0.4
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 550-PVRV Pressure/Vacuum Relief Valve 50 mm (2 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-18-03FC0273b
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com232
0.0 0.5 1.0 1.5 2.0
0
1
2
3
4
5
6
7
0.0 0.5 1.0 1.5 2.0
352 mm wc
176 mm wc
88 mm wc
44 mm wc
22 mm wc
PRESSURESeries 550-PVRV Vent to AtmospherePressure/Vacuum Relief Valve 80 mm (3 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0262A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 233
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
-7
-6
-5
-4
-3
-2
-1
0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 550-PVRV Pressure/Vacuum Relief Valve 80 mm (3 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-18-03FC0277B
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com234
0.0 0.5 1.0 1.5 2.0 2.5 3.0
0
1
2
3
4
5
6
7
0.0 0.5 1.0 1.5 2.0 2.5 3.0
PRESSURESeries 550-PVRV Vent to AtmospherePressure/Vacuum Relief Valve 100 mm (4 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0264A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 235
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
-7
-6
-5
-4
-3
-2
-1
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
VACUUMSeries 550-PVRV Pressure/Vacuum Relief Valve 100 mm (4 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-18-03FC0281B
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
4 oz.
2 oz.
1 oz.1/2 oz.22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com236
0 1 2 3 4 5 6
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6
PRESSURESeries 550-PVRV Vent to AtmospherePressure/Vacuum Relief Valve 150 mm (6 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0266A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 237
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
-7
-6
-5
-4
-3
-2
-1
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
VACUUMSeries 550-PVRV Pressure/Vacuum Relief Valve 150 mm (6 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-18-03FC0285B
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
4 oz.
2 oz.
1 oz.1/2 oz.22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com238
0 1 2 3 4 5 6 7 8 9 10 11 12
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7 8 9 10 11 12
PRESSURESeries 550-PVRV Vent to AtmospherePressure/Vacuum Relief Valve 200 mm (8 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0268A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 239
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0 1 2 3 4 5 6 7 8 9
-7
-6
-5
-4
-3
-2
-1
0
0 1 2 3 4 5 6 7 8 9
VACUUMSeries 550-PVRV Pressure/Vacuum Relief Valve 200 mm (8 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. B 6-23-03FC0289b
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
4 oz.
2 oz.
1 oz.1/2 oz.22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com240
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
PRESSURESeries 550-PVRV Vent to AtmospherePressure/Vacuum Relief Valve 250 mm (10 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0270A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 241
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0 1 2 3 4 5 6 7 8 9 10 11
-7
-6
-5
-4
-3
-2
-1
0
0 1 2 3 4 5 6 7 8 9 10 11
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 550-PVRV Pressure/Vacuum Relief Valve 250 mm (10 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. A 4-20-03FC0293
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com242
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
0
1
2
3
4
5
6
7
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
8 oz.
4 oz.
2 oz.
1 oz.
1/2 oz.
PRESSURESeries 550-PVRV Vent to AtmospherePressure/Vacuum Relief Valve 300 mm (12 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
Rev. A 4-16-03FC0258A
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
176 mm wc
88 mm wc
44 mm wc
44 mm wc22 mm wc
352 mm wc
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 243
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Metric Units
0 1 2 3 4 5 6 7 8 9 10 11 12 13
-7
-6
-5
-4
-3
-2
-1
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
4 oz.
2 oz.
1 oz.1/2 oz.
VACUUMSeries 550-PVRV Pressure/Vacuum Relief Valve 300 mm (12 in.) Connection
Tan
k P
ress
ure
(kP
a)
Air Flow (1000's Nm3/hr)
-750
-700
-650
-600
-550
-500
-450
-400
-350
-300
-250
-200
-150
-100
-50
0
Rev. A 4-20-03FC0297
Tan
k P
ress
ure
(mill
imet
ers
of w
ater
col
umn)
22 mm wc44 mm wc
88 mm wc
176 mm wc
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com244
0 5 10 15 20 25 300
5
10
15
20
25
300 5 10 15 20 25 30
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
2.0 oz. setting
8.0 oz. setting
4.0 oz. setting
1.0 oz. setting
0.5 oz. se
tting
PRESSURESeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FFC0259A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 245
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 1 2 3 4 5 6 7 8 9 10 11 12 13-30
-25
-20
-15
-10
-5
00 1 2 3 4 5 6 7 8 9 10 11 12 13
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0271
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com246
0 5 10 15 20 25 30 35 40 45 50 55 60 650
5
10
15
20
25
300 5 10 15 20 25 30 35 40 45 50 55 60 65
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet ConnectionPRESSURESeries 550
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1.0 oz. setting
2.0 oz. setting
4.0 oz. setting
8.0 oz. setting
0.5 oz. setting
Rev. A 4-16-03FC0261A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 247
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 5 10 15 20 25-30
-25
-20
-15
-10
-5
00 5 10 15 20 25
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0275A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com248
0 10 20 30 40 50 60 70 80 90 1000
5
10
15
20
25
300 10 20 30 40 50 60 70 80 90 100
Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet Connection
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
PRESSURESeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FC0263A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 249
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 5 10 15 20 25 30 35 40-30
-25
-20
-15
-10
-5
00 5 10 15 20 25 30 35 40
Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet Connection
VACUUMSeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Rev. A 4-20-03FC0279A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com250
0 20 40 60 80 100 120 140 160 180 2000
5
10
15
20
25
300 20 40 60 80 100 120 140 160 180 200
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
1.0 oz. setting
2.0 oz. setting
4.0 oz. setting
8.0 oz. setting
0.5 oz. setting
PRESSURESeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FC0265A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 251
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 10 20 30 40 50 60 70 80 90 100 110-30
-25
-20
-15
-10
-5
00 10 20 30 40 50 60 70 80 90 100 110
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0283a
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com252
0 50 100 150 200 250 300 350 400 4500
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450
Pressure/Vacuum Relief Valve 200 mm (8 in.) Inlet Connection
4.0 oz. setting
8.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
PRESSURESeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FC0267A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 253
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 50 100 150 200 250 300-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300
Pressure/Vacuum Relief Valve 200 mm (8 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0287a
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com254
0 50 100 150 200 250 300 350 400 450 500 5500
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450 500 550
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet Connection
8.0 oz. setting
2.0 oz. setting
4.0 oz. setting
1.0 oz. setting
0.5 oz. setting
PRESSURESeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FC0269A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 255
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 50 100 150 200 250 300 350 400-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300 350 400
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03FC0291a
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com256
0 50 100 150 200 250 300 350 400 450 500 550 6000
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450 500 550 600
300 mm (12 in.) Inlet Connection
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
PRESSURESeries 550Pressure/Vacuum Relief Valve
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Rev. A 4-16-03FC0257A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 257
Model 550 Pressure Vacuum Relief ValvePressure Drop Curves Imperial Units
0 50 100 150 200 250 300 350 400 450-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300 350 400 450
Pressure/Vacuum Relief Valve 300 mm )12 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 550T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
Rev. A 4-20-03Fc0295a
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com258
0 5 10 15 20 25 300
5
10
15
20
25
300 5 10 15 20 25 30
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0001A
PRESSURESeries 850, 851T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 259
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
0 5 10 15 20 25-30
-25
-20
-15
-10
-5
00 5 10 15 20 25
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
VACUUMSeries 850T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
2.0 oz. setting
4.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0005A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com260
0 10 20 30 40 50 600
5
10
15
20
25
300 10 20 30 40 50 60
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
8.0 oz. setting
4.0 oz. setting
1.0 oz. setting
0.5 oz. setting
2.0 oz. setting
PRESSURESeries 850, 851T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0002A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 261
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
0 5 10 15 20 25 30-30
-25
-20
-15
-10
-5
00 5 10 15 20 25 30
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
VACUUMSeries 850T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0006A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com262
0 10 20 30 40 50 60 70 80 90 1000
5
10
15
20
25
300 10 20 30 40 50 60 70 80 90 100
Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet Connection
PRESSURESeries 850, 851T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0003A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 263
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
0 10 20 30 40 50 60 70 80-30
-25
-20
-15
-10
-5
00 10 20 30 40 50 60 70 80
Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet Connection
VACUUMSeries 850T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0007A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com264
0 20 40 60 80 100 120 140 160 1800
5
10
15
20
25
300 20 40 60 80 100 120 140 160 180
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. se
tting
PRESSURESeries 850, 851T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0004A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 265
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
0 20 40 60 80 100 120 140-30
-25
-20
-15
-10
-5
00 20 40 60 80 100 120 140
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 850T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0008A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com266
0 50 100 150 200 250 300 350 4000
5
10
15
20
25
300 50 100 150 200 250 300 350 400
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. se
tting
200 mm (8 in.) Inlet ConnectionPressure/Vacuum Relief Valve
PRESSURESeries 850, 851T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 4-1-98FC0119A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 267
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
0 50 100 150 200 250-30
-25
-20
-15
-10
-5
00 50 100 150 200 250
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Pressure/Vacuum Relief Valve 200 mm (8 in.) Inlet Connection
VACUUMSeries 850T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 4-1-98FC0121A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com268
0 50 100 150 200 250 300 350 400 450 500 550 6000
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450 500 550 600
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet Connection
PRESSURESeries 850, 851T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. se
tting
rev. A 3-31-98FC0120A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 269
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
0 50 100 150 200 250 300-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet ConnectionVACUUMSeries 850
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 4-1-98FC0122A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com270
0 50 100 150 200 250 300 350 400 450 500 550 6000
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450 500 550 600
Pressure/Vacuum Relief Valve 300 mm (12 in.) Inlet Connection
PRESSURESeries 850, 851T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
1/2 oz.1 oz.
2 oz.
4 oz.
8 oz.
rev. C 9-6-00FC0197C
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 271
Model 850 Pressure Vacuum Relief ValvePressure Drop Curves
0 50 100 150 200 250 300-20
-15
-10
-5
00 50 100 150 200 250 300
4.0 inWC setting
5.0 oz. setting
2.0 inWC setting
1.0 inWC setting
0.5 oz. setting
Pressure/Vacuum Relief Valve 300 mm (12 in.) Inlet ConnectionVACUUMSeries 850
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 8-4-00FC0196A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com272
0 5 10 15 20 25 300
5
10
15
20
25
300 5 10 15 20 25 30
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
PRESSURESeries 950, 951T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0009A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 273
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
0 5 10 15 20 25-30
-25
-20
-15
-10
-5
00 5 10 15 20 25
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
VACUUMSeries 950, 952T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0013A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com274
0 10 20 30 40 50 600
5
10
15
20
25
300 10 20 30 40 50 60
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
rev. A 6-17-97FC0010A
PRESSURESeries 950, 951T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 275
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
0 5 10 15 20 25 30-30
-25
-20
-15
-10
-5
00 5 10 15 20 25 30
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 950, 952T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0014A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com276
0 20 40 60 80 100 1200
5
10
15
20
25
300 20 40 60 80 100 120
Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet ConnectionPRESSURESeries 950, 951
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0011A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 277
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
0 10 20 30 40 50 60 70 80-30
-25
-20
-15
-10
-5
00 10 20 30 40 50 60 70 80
Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet Connection
VACUUMSeries 950, 952T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
rev. A 6-17-97FC0015A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com278
0 40 80 120 160 200 2400
5
10
15
20
25
300 40 80 120 160 200 240
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
PRESSURESeries 950, 951T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. se
tting
rev. A 6-17-97FC0012A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 279
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
0 20 40 60 80 100 120 140-30
-25
-20
-15
-10
-5
00 20 40 60 80 100 120 140
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 950, 952T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0016A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com280
0 50 100 150 200 250 300 350 400 4500
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450
Pressure/Vacuum Relief Valve 200 mm (8 in.) Inlet Connection
PRESSURESeries 950, 951T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. se
tting
rev. A 4-1-98FC0123A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 281
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
0 50 100 150 200 250-30
-25
-20
-15
-10
-5
00 50 100 150 200 250
Pressure/Vacuum Relief Valve 200 mm (8 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 950, 952T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 4-1-98FC0125A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com282
0 100 200 300 400 500 600 7000
5
10
15
20
25
300 100 200 300 400 500 600 700
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet Connection
PRESSURESeries 950, 951T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting0.5 oz.
settin
g
rev. A 4-1-98FC0124A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 283
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
0 50 100 150 200 250 300-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300
Pressure/Vacuum Relief Valve 250 mm (10 in.) Inlet Connection
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. setting
VACUUMSeries 950, 952T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 4-1-98FC0126A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com284
0 50 100 150 200 250 300 350 400 450 500 550 600 6500
5
10
15
20
25
300 50 100 150 200 250 300 350 400 450 500 550 600 650
Pressure/Vacuum Relief Valve 300 mm (12 in.) Inlet Connection
PRESSURESeries 950, 951T
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0 oz. setting
4.0 oz. setting
2.0 oz. setting
1.0 oz. setting
0.5 oz. se
tting
Rev. A 7-2-02FC0155B
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 285
Model 950 Pressure Vacuum Relief ValvePressure Drop Curves
0 50 100 150 200 250 300-20
-15
-10
-5
00 50 100 150 200 250 300
4.0 inWC setting
5.0 oz. setting
2.0 inWC setting
1.0 inWC setting
0.5 oz. setting
Pressure/Vacuum Relief Valve 300 mm (12 in.) Inlet ConnectionVACUUMSeries 950,952
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 8-4-00FC0199A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com286
0 10 20 30 40 50 60 70 80 90 1000
5
10
15
20
25
300 10 20 30 40 50 60 70 80 90 100
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
rev. B 3-21-00FC0188B
PRESSURESeries 860T
ank
Pre
ssur
e (p
si)
Air Flow (1000's SCFH)
0
5
10
15
20
25
30
Tan
k P
ress
ure
(psi
)
1/2 psi1 psi
2 psi
4 psi
8 psi
12 psi
15 psi
Model 860 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 287
Model 860 Pressure Vacuum Relief ValvePressure Drop Curves
0 50 100 150 200 250 3000
5
10
15
20
25
300 50 100 150 200 250 300
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
Rev. B 4-3-00FC0189B
PRESSURESeries 860T
ank
Pre
ssur
e (p
si)
Air Flow (1000's SCFH)
0
5
10
15
20
25
30
Tan
k P
ress
ure
(psi
)
1/2 psi1 psi
2 psi
4 psi
8 psi
12 psi
15 psi
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com288
0 100 200 300 400 500 6000
5
10
15
20
25
300 100 200 300 400 500 600
Spring Loaded Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet Connection
PRESSURESeries 860T
ank
Pre
ssur
e (p
si)
Air Flow (1000's SCFH)
0
5
10
15
20
25
30
Rev. B 4-3-00FC0192B
Tan
k P
ress
ure
(psi
)
1/2 psi1 psi
2 psi
4 psi
8 psi
12 psi
15 psi
Model 860 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 289
Model 860 Pressure Vacuum Relief ValvePressure Drop Curves
0 100 200 300 400 500 600 700 8000
5
10
15
20
25
300 100 200 300 400 500 600 700 800
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
rev. B 4-3-00FC0194B
PRESSURESeries 860T
ank
Pre
ssur
e (p
si)
Air Flow (1000's SCFH)
0
5
10
15
20
25
30
Tan
k P
ress
ure
(psi
)
1/2 psi1 psi
4 psi
8 psi
12 psi
15 psi
2 psi
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com290
0 20 40 60 80 100 120 140 160 1800
5
10
15
20
25
300 20 40 60 80 100 120 140 160 180
Pressure/Vacuum Relief Valve 50 mm (2 in.) Inlet Connection
rev. B 3-22-00FC0191B
PRESSURESeries 960T
ank
Pre
ssur
e (p
si)
Air Flow (1000's SCFH)
0
5
10
15
20
25
30
Tan
k P
ress
ure
(psi
)
1/2 psi1 psi
2 psi
4 psi
8 psi
12 psi
15 psi
Model 960 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 291
Model 960 Pressure Vacuum Relief ValvePressure Drop Curves
0 50 100 150 200 250 300 3500
5
10
15
20
25
300 50 100 150 200 250 300 350
Pressure/Vacuum Relief Valve 80 mm (3 in.) Inlet Connection
Rev. B 3-22-00FC0190B
PRESSURESeries 960T
ank
Pre
ssur
e (p
si)
Air Flow (1000's SCFH)
0
5
10
15
20
25
30
Tan
k P
ress
ure
(psi
)
1/2 psi1 psi2 psi
4 psi
8 psi
12 psi
15 psi
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com292
0 100 200 300 400 500 6000
5
10
15
20
25
300 100 200 300 400 500 600
Pressure/Vacuum Relief Valve 100 mm (4 in.) Inlet ConnectionPRESSURESeries 960
Tan
k P
ress
ure
(psi
)
Air Flow (1000's SCFH)
0
5
10
15
20
25
30
rev. B 4-3-00FC0193b
Tan
k P
ress
ure
(psi
)
1/2 psi1 psi
2 psi
4 psi
8 psi
12 psi
15 psi
Model 960 Pressure Vacuum Relief ValvePressure Drop Curves
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 293
Model 960 Pressure Vacuum Relief ValvePressure Drop Curves
0 100 200 300 400 500 600 700 800 9000
5
10
15
20
25
300 100 200 300 400 500 600 700 800 900
Pressure/Vacuum Relief Valve 150 mm (6 in.) Inlet Connection
rev. B 4-3-00FC0195B
PRESSURESeries 960T
ank
Pre
ssur
e (p
si)
Air Flow (1000's SCFH)
0
5
10
15
20
25
30
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
1/2 psi1 psi2 psi
4 psi
8 psi
12 psi
15 psi
ENARDO PVRVENARDO PVRV
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com294
ENARDO EPRVENARDO EPRVModel 2000/2500 Emergency Pressure Relief ValvePressure Drop Curves
0 10 20 30 40 50 60 70 80 90 1000
5
10
15
20
25
300 10 20 30 40 50 60 70 80 90 100
4 oz. setting
8 oz. setting
12 oz. setting
PRESSURE100 mm (4 in.) Inlet Connections
Series 2004Emergency Pressure Relief Vent
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. b 1-16-04FC0109b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 295
ENARDO EPRVENARDO EPRV
0 50 100 150 200 250 300 350 4000
5
10
15
20
25
300 50 100 150 200 250 300 350 400
4 oz. setting
8 oz. setting
12 oz. setting
PRESSURE200 mm (8 in.) Inlet Connections
Series 2008 Emergency Pressure Relief Vent
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. b 1-16-04FC0110b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
Model 2000/2500 Emergency Pressure Relief ValvePressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com296
ENARDO EPRVENARDO EPRVModel 2000/2500 Emergency Pressure Relief ValvePressure Drop Curves
0 100 200 300 400 500 600 700 8000
5
10
15
20
25
300 100 200 300 400 500 600 700 800
4 oz. setting
8 oz. setting
12 oz. setting
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. b 1-16-04FC0111b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
PRESSURE300 mm (12 in.) Inlet Connections
Series 2012 Emergency Pressure Relief Vent
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 297
ENARDO EPRVENARDO EPRV
0 100 200 300 400 500 600 700 800 900 100011000
5
10
15
20
25
300 100 200 300 400 500 600 700 800 900 10001100
4 oz. setting
8 oz. setting
12 oz. setting
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. b 1-16-04FC0112b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
PRESSURE400 mm (16 in.) Inlet Connections
Series 2016, 2516Emergency Pressure Relief Vent
Model 2000/2500 Emergency Pressure Relief ValvePressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com298
ENARDO EPRVENARDO EPRVModel 2000/2500 Emergency Pressure Relief ValvePressure Drop Curves
0 200 400 600 800 1000 1200 1400 16000
5
10
15
20
25
300 200 400 600 800 1000 1200 1400 1600
4 oz. setting
8 oz. setting
12 oz. setting
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. b 1-16-04FC0114b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
PRESSURE500 mm (20 in.) Inlet Connections
Series 2020, 2520 Emergency Pressure Relief Vent
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 299
ENARDO EPRVENARDO EPRV
0 500 1000 1500 2000 25000
5
10
15
20
25
300 500 1000 1500 2000 2500
4 oz. setting
8 oz. setting
12 oz. setting
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. b 1-16-04FC0115b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
PRESSURE600 mm (24 in.) Inlet Connections
Series 2024, 2524 Emergency Pressure Relief Vent
Model 2000/2500 Emergency Pressure Relief ValvePressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com300
ENARDO EPRVENARDO EPRVModel 2500Emergency Pressure Relief ValvePressure Drop Curves
0 20 40 60 80 100 120 140 160-30
-25
-20
-15
-10
-5
00 20 40 60 80 100 120 140 160
2 oz.
1 oz. 0.75 oz.0.5 oz.
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. b 1-16-04FC0118b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
VACUUM400 mm (16 in.) Connections
Series 2516 Emergency Pressure Relief Vent w/Vac.
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 301
ENARDO EPRVENARDO EPRV
0 50 100 150 200 250 300-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300
2 oz.
1 oz. 0.75 oz.
0.5 oz.
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. b 1-16-04FC0163b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
VACUUM500 mm (20 in.) Connections
Series 2520Emergency Pressure Relief Vent w/Vac.
Model 2500Emergency Pressure Relief ValvePressure Drop Curves
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com302
ENARDO EPRVENARDO EPRVModel 2500Emergency Pressure Relief ValvePressure Drop Curves
0 50 100 150 200 250 300 350-30
-25
-20
-15
-10
-5
00 50 100 150 200 250 300 350
2 oz.
1 oz. 0.75 oz.
0.5 oz.
Pre
ssur
e D
rop
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. b 1-16-04FC0165b
Pre
ssur
e D
rop
(oun
ces
per
squa
re in
ch)
VACUUM600 mm (24 in.) Connections
Series 2524Emergency Pressure Relief Vent w/Vac.
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 303
Model A and A-L Thief HatchPressure Drop Curves
0 50 100 150 200 250 300 350 4000
5
10
15
20
25
300 50 100 150 200 250 300 350 400
2.0 oz. setting
4.0 oz. setting
6.0 oz. setting
PRESSUREModel A
Thief HatchT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0017A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com304
0 5 10 15 20 25 30-30
-25
-20
-15
-10
-5
00 5 10 15 20 25 30
VACUUMModel AThief Hatch
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
00.4 oz. setting
rev. A 6-17-97FC0029A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model A and A-L Thief HatchPressure Drop Curves
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 305
Model A and A-L Thief HatchPressure Drop Curves
0 100 200 300 400 500 600 7000
5
10
15
20
25
300 100 200 300 400 500 600 700
2 oz. setting
4 oz. setting
6 oz. setting
PRESSUREModel A-L
Thief HatchT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0018A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com306
0 10 20 30 40 50-30
-25
-20
-15
-10
-5
00 10 20 30 40 50
VACUUMModel A-L
Thief Hatch
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
0.4 oz. setting
rev. A 6-17-97FC0030A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model A and A-L Thief HatchPressure Drop Curves
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 307
Model A and A-L Thief HatchPressure Drop Curves
0 50 100 150 200 250 300 350 4000
5
10
15
20
25
300 50 100 150 200 250 300 350 400
2.0 oz. setting
1.0 oz. setting
PRESSUREModel 110-PO
Thief HatchT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0019A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com308
0 100 200 300 400 500 600 700 8000
5
10
15
20
25
300 100 200 300 400 500 600 700 800
1 oz. setting
2oz. setting
4 oz. setting
6 oz. setting
PRESSUREModel 200
Thief Hatch
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0020A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model A and A-L Thief HatchPressure Drop Curves
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 309
Model A and A-L Thief HatchPressure Drop Curves
0 10 20 30 40 50-30
-25
-20
-15
-10
-5
00 10 20 30 40 50
0.4 oz. setting
VACUUMModel 200
Thief HatchT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0031A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com310
0 10 20 30 40 50 60 700
5
10
15
20
25
300 10 20 30 40 50 60 70
PRESSUREModel 330
Thief Hatch
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
178.
0 oz
. set
ting
12.0
oz.
settin
g
6.0
oz. s
ettin
g
4.0 oz. se
tting
2.0 oz. se
tting
rev. A 6-17-97FC0021A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 330 and 330-L Thief HatchesPressure Drop Curves
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 311
Model 330 and 330-L Thief HatchesPressure Drop Curves
0 10 20 30 40 50 60 70 80-30
-25
-20
-15
-10
-5
00 10 20 30 40 50 60 70 80
0.4 oz. setting
VACUUMModel 330
Thief HatchT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0032A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com312
0 10 20 30 40 50 60 700
5
10
15
20
25
300 10 20 30 40 50 60 70
PRESSUREModel 330-L
Thief Hatch
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
12 oz. setting
8 oz. setting
6 oz. setting
4 oz. setting
2 oz. setting
rev. A 6-17-97FC0022A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 330 and 330-L Thief HatchesPressure Drop Curves
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 313
Model 330 and 330-L Thief HatchesPressure Drop Curves
0 10 20 30 40 50 60 70 80-30
-25
-20
-15
-10
-5
00 10 20 30 40 50 60 70 80
0.4 oz. setting
VACUUMModel 330-L
Thief HatchT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0033A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com314
0 5 10 15 20 25 30 35 40 45 500
5
10
15
20
25
300 5 10 15 20 25 30 35 40 45 50
12.0
oz.
set
ting
8.0
oz. s
ettin
g
6.0 oz. se
tting
2.0 oz. setting
4.0 oz. se
tting
PRESSUREModel 660, 660-B
Thief Hatch
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
rev. A 6-17-97FC0023A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
FC0024A
Model 660 and 660-L Thief HatchesPressure Drop Curves
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 315
Model 660 and 660-L Thief HatchesPressure Drop Curves
0 10 20 30 40 50 60 70 80-30
-25
-20
-15
-10
-5
00 10 20 30 40 50 60 70 80
0.4 oz. setting
VACUUMModel 660, 660-BThief Hatch
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0035AFC0034A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com316
0 5 10 15 20 25 30 350
5
10
15
20
25
300 5 10 15 20 25 30 35
rev. A 6-17-97FC0026AFC0025A
PRESSUREModel 660-L, 660-LBThief Hatch
Tan
k P
ress
ure
(inch
es o
f wat
er c
olum
n)
Air Flow (1000's SCFH)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
8.0
oz. s
ettin
g
6.0 oz. se
tting
4.0 oz. setting
2.0 oz. setting
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
Model 660 and 660-L Thief HatchesPressure Drop Curves
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com 317
Model 660 and 660-L Thief HatchesPressure Drop Curves
0 10 20 30 40 50 60 70-30
-25
-20
-15
-10
-5
00 10 20 30 40 50 60 70
0.4 oz. setting
VACUUMModel 660-L, 660-LB
Thief HatchT
ank
Pre
ssur
e (in
ches
of w
ater
col
umn)
Air Flow (1000's SCFH)
-17
-16
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
rev. A 6-17-97FC0037AFC0036A
Tan
k P
ress
ure
(oun
ces
per
squa
re in
ch)
ENARDO HatchesENARDO Hatches
ENARDO • 4470 S. 70th East Ave. • Tulsa, OK 74145-4607 • 1-800-336-2736 U.S. and Canada • www.enardo.com
ENARDO Flame ArrestorTechnology
ENARDO Flame ArrestorTechnology
Visit our web site at:www.enardo.com to find technicalinformation, quotation request forms oryour local representative.
Contact Us:Enardo • 4470 South 70th East Avenue • Tulsa, Oklahoma 74145-4607, USATelephone: 1-918-622-6161 • Fax: 1-918-622-0004 • Toll Free (US and Canada) 1-800-336-2736
