12381 FBA Flash back arrestor

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

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ANTI

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ION

NEL

LE

5 JA

AR GA

RANTIE ONDER VOORWAARDEN

5

AOS DE GARANTA CONDIC

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5 A

NO

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5 JAHRE BEDINGTE GARA

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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


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

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



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



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

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



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



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

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



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



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

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



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,


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,


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,


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

Documents

12381 FBA Flash back arrestor