FN40 Decomposition Arrestor 1 1/2″ BSP RH [21.003]

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For Acetylene, Hydrogen, NG, LPG


Max. flow: twice flow of FN12 refer to PDF

Max. Working Pressure:

Acetylene – 1.5 bar

Hydrogen – 3 bar

NG – 2 bar

LPG – 1.5 bar

Flame arrestor

Temperature sensitive cut-off valve

Item #: 1122
Quantity Available: 100

100 in stock


WITT Decomposition Arrestors for reliable protection against decomposition of acetylene and flashbacks of fuel gases. Every Arrestor 100% tested.

The best Safety Devices in the world

  • a large surface area flame arrestor FA of stainless steel construction:
    – stops dangerous decomposition of acetylene independent from flow direction
    – extinguishes any dangerous flashback entering the device in any direction
  • a temperature-sensitive cut-off valve TV extinguishes sustained flashbacks long before the internal temperature of the arrestor reaches a dangerous level

Operation / Usage:

  • as a Decomposition Arrestor for acetylene in medium-pressure pipelines for protection of cylinder equipment and bundles in accordance with EN ISO 14114
  • as a safety device (FN40) to protect against flashbacks in accordance to DIN EN ISO 5175-1 – not for acetylene
  • as a Decomposition Arrestor to protect pipelines in supply systems
  • FN40 for double flow capacity
  • WITT Decomposition Arrestors / safety devices may be mounted in any position / orientation
  • the maximum ambient / working temperature is 70 °C / 158 °F


  • it is recommended that an annual body leakage test is performed
  • Decomposition Arrestors / safety devices are only to be serviced by the manufacturer

Company certified to ISO 9001 and PED 2014/68/EC Module H
CE-marked in accordance with 2014/68/EC


View PDF File


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