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Guide for flashback arrestor
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Resettable flashback arrestors: These feature a pressure-sensitive cut-off
device and a highly visible indicator lever. They
are ideal for tough industrial environments.
Standard flashback arrestors:A compact safety device offering the standard
level of protection, non-return valve, inlet
filter, thermal cut-off device and flame-
arresting sintered element.
Premier flashback arrestors:Sleek brass design with a drop-down
shroud indicating the activation of the
pressure-sensitive cut-off valve.
Torch-mount flashback arrestors:A compact safety device for torches, with
flame arrestor of stainless steel construction,
non-return valve and filter.
5 A
NN
I DI G
ARA
NZIA CONDIZIONALE 5 ANS DE
GAR
ANTI
E CO
NDIT
ION
NEL
LE
5 JA
AR GA
RANTIE ONDER VOORWAARDEN
5
AOS DE GARANTA CONDIC
IONAL
5 A
NO
S D
E GARANT
IA
5 JAHRE BEDINGTE GARA
NTIE
Linde flashback arrestors feature:Inlet filter a large stainless steel surface made from wire mesh to prevent foreign matter A.
entering the unit.
Signal lever (resettable), drop-down shroud (on Premier flashback arrestor).B.
Non-return valve (NV) a spring-loaded valve preventing the backfeed of gas upstream C.
of the flashback arrestor.
Flame Arrestor (FA) a large sintered stainless steel element for repeatedly arresting flames.D.
Temperature-activated cut-off valve (TV) a valve that cuts off gas supply in the event of E.
sustained, multiple flashbacks or a flame being held in the device. Once activated, this cannot
be reset and the unit must be replaced.
Linde Premier FBAs also feature:
A pressure-sensitive cut-off device (PV) a valve that isolates the gas supply if a backfeed of F.
gas is detected. When this valve is activated, the signal lever B is raised or the shroud drops to
alert the user to a potentially dangerous situation. Once the cause of the backfeed has been
corrected, the flashback arrestor can be reset and the user can continue in safety.
Linde flashback arrestors are precision-manufactured, assembled and individually tested to the highest manufacturing standards. The superior quality of Linde flashback arrestors makes them essential to the Linde range.
A.
B.
F.
C.
D.
E.
A.
B.
F.
C.
D.
E.
A.
D.
C.
E.
Linde flashback arrestors.
restrecText Box
010
20
30
40
50
60
70
2
4
6
8
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2 3 4 6 8 10
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Flow diagram for air (20C/68F) Flow diagram for air (20C/68F)
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Flow diagram for air (20C/68F)
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6p=0.3
1013 mbar, OC
0
2
4
6
8
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2 3 4 6 8 10 12
100
80
60
40
20p=0.6
0 000
12
24
36
48
60
72
84
96
108
120
1.2
2.4
3.6
4.8
6.0
7.2
8.4
9.6
10.8
12
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2
p=Pv
p=Pv
p=0.3
p=0.6
p=0.3
4 6 10 20
1013mbar, OC
Flow diagram for air (20C/68F)
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r /14
.7 p
si, 0
C/
32F
p=0.6
0 0102030405060708090100110
120 130
1
2
3
4
5
6
7
8
9
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2
p=Pv
p=Pv
p=0.3
p=0.6
p=0.3
4 6 10 20
1013mbar, OC
0
10
20
30
40
50
60
70
2
4
6
8
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2 3 4 6 8 10
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Flow diagram for air (20C/68F) Flow diagram for air (20C/68F)
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Flow diagram for air (20C/68F)
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6p=0.3
1013 mbar, OC
0
2
4
6
8
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2 3 4 6 8 10 12
100
80
60
40
20p=0.6
0 000
12
24
36
48
60
72
84
96
108
120
1.2
2.4
3.6
4.8
6.0
7.2
8.4
9.6
10.8
12
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2
p=Pv
p=Pv
p=0.3
p=0.6
p=0.3
4 6 10 20
1013mbar, OC
Flow diagram for air (20C/68F)
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
p=0.6
0 0102030405060708090100110
120 130
1
2
3
4
5
6
7
8
9
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2
p=Pv
p=Pv
p=0.3
p=0.6
p=0.3
4 6 10 20
1013mbar, OC
0
10
20
30
40
50
60
70
2
4
6
8
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2 3 4 6 8 10
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Flow diagram for air (20C/68F) Flow diagram for air (20C/68F)
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Flow diagram for air (20C/68F)
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6p=0.3
1013 mbar, OC
0
2
4
6
8
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2 3 4 6 8 10 12
100
80
60
40
20p=0.6
0 000
12
24
36
48
60
72
84
96
108
120
1.2
2.4
3.6
4.8
6.0
7.2
8.4
9.6
10.8
12
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2
p=Pv
p=Pv
p=0.3
p=0.6
p=0.3
4 6 10 20
1013mbar, OC
Flow diagram for air (20C/68F)
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r /14
.7 p
si, 0
C/
32F
p=0.6
0 0102030405060708090100110
120 130
1
2
3
4
5
6
7
8
9
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2
p=Pv
p=Pv
p=0.3
p=0.6
p=0.3
4 6 10 20
1013mbar, OC
0
10
20
30
40
50
60
70
2
4
6
8
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2 3 4 6 8 10
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Flow diagram for air (20C/68F) Flow diagram for air (20C/68F)
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Flow diagram for air (20C/68F)
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6
p=0.3
p=Pv
p=0.6p=0.3
1013 mbar, OC
0
2
4
6
8
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2 3 4 6 8 10 12
100
80
60
40
20p=0.6
0 000
12
24
36
48
60
72
84
96
108
120
1.2
2.4
3.6
4.8
6.0
7.2
8.4
9.6
10.8
12
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2
p=Pv
p=Pv
p=0.3
p=0.6
p=0.3
4 6 10 20
1013mbar, OC
Flow diagram for air (20C/68F)
Inlet pressure Pv [bar] Opening pressure: 30 mbar
Stan
dard
vol
ume
flow
[N
m3 /
h](1
013
mba
r/14
.7 p
si, 0
C/
32F
p=0.6
0 0102030405060708090100110
120 130
1
2
3
4
5
6
7
8
9
10
0.05 0.1 0.2 0.3 0.6 1.0 1.5 2
p=Pv
p=Pv
p=0.3
p=0.6
p=0.3
4 6 10 20
1013mbar, OC
Standard flashback arrestors
Resettable flashback arrestor
Torch-mount flashback arrestors
Premier flashback arrestor
Flashback arrestor flow charts
Gas Conversion factorAcetylene 1.04
Methane 1.33
Propane 0.80
Oxygen 0.95
Hydrogen 3.75
Natural gas 1.25
Flashback Arrestors
Part no. Linde description Gas Connection Max. working pressure Weight (g)
725201 Standard flashback arrestor Fuel G 3/8" LH Acetylene 1.5 bar, Natural gas 5.0 bar,
Propane 5.0 bar, Hydrogen 3.0 bar
195
725205 Standard flashback arrestor Oxygen G 3/8" RH Air/Oxygen 30 bar 195
725200 Torch-mount flashback arrestor Fuel G 3/8" LH,
G 1/4" LH
Acetylene 1.5 bar, Natural gas 5.0 bar,
Propane 5.0 bar, Hydrogen 4.0 bar
107
725206 Torch-mount flashback arrestor Oxygen G 3/8" RH Air/Oxygen 20 bar 107
725202 Premier flashback arrestor Fuel G 3/8" LH Acetylene 1.5 bar, Natural gas,
Propane 5.0 bar, Hydrogen 3.0 bar
321
725207 Premier flashback arrestor Oxygen G 3/8" RH Air/Oxygen 20 bar 321
725203 Resettable flashback arrestor Fuel G 3/8" LH Acetylene 1.5 bar, Natural gas 5.0 bar,
Propane 4.0 bar, Hydrogen 5.0 bar
600
725208 Resettable flashback arrestor Oxygen G 3/8" RH Air/Oxygen 10 bar 600
A flashback is a flame travelling at supersonic speed in the opposite direction to normal gas flow in
oxy-fuel gas equipment. The backfeeding of gases that promotes flashbacks is generally caused by
one of the following:
Excessive pressure. If the flow rate exceeds the nozzle capacity, the gas at the higher pressure then flows into the lower-pressure gas line. This will occur if incorrect pressures
are used or if nozzles, cutting attachments and welding torches are incompatible
Lighting up incorrectly with both torch control valves open but one cylinder closed. In spite of better equipment, flashbacks remain a problem in oxy-fuel gas systems. There are many reasons
for this, including the growing use of welding and cutting equipment by unskilled or semi-skilled
persons who sometimes short-cut safety procedures in order to save time
A drop in pressure of either gas due to leaks in the regulator, hose or connections. This results in backfeeding into the low-pressure line
The reverse flow of gases during temporary storage or shutdown, incorrect closedown procedures or malfunctioning valves or regulators
UK0
208
1.
0 Vo
l
Linde AG Linde Gas Division, Linde Gas Headquarters, Seitnerstrasse 70, 82049 Pullach, Germany Phone +49.89.74 46-0, Fax +49.89.74 46-12 30, www.linde.com
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