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Flame Arrestor (Horizontal, in-line, detonation)

  • Flame Arrestor (Horizontal, in-line, detonation)
  • Flame Arrestor (Horizontal, in-line, detonation)
  • Flame Arrestor (Horizontal, in-line, detonation)

Model No: 321

ERGIL Storagetech™’s Model 321 In-line Detonation Flame Arrestor (also called flame arrestor or fire arrestor) is designed for installation in gas pipelines. Detonation occurs when a flame travelling through the pipeline reaches supersonic velocities, usually as a result of the pipeline configuration or pipeline surface roughness. Changes in gas density and pressure causes the flame velocity to metamorphose from subsonic to supersonic.

The flame quenching element is designed to be three or four times the area of the pipe in which it is installed, and is assembled between two flanged reducing spools. The element comprises a tightly rolled scroll or scrolls of crimped stainless steel ribbon to form passages through which the vapour passes. The area of each passage determines level of protection that the element provides. ERGIL Storagetech™’s Model 321 In-line Detonation Flame Arrestor has a maximum experimental safe gap (MESG) as per the standard, and is suitable for gas groups IIB and IIA.

The detonation flame arrestor is more robust than the deflagration flame arrestor, and contiguous scrolls have smaller MESGs to withstand higher pressures and to quench detonations. It should be installed in the pipeline where there is a significant distance between the unit and the potential source of ignition.

The unit is supplied with an earth point, copper tag and cable. Temperature sensor can be provided upon request. The element can easily be removed for cleaning or replacement.


Standard sizes : 1” to 12” DN25 to DN300
Body / Flanges 1-) Carbon steel
2-) Stainless steel AISI 316 –L or 304-L
3-) Aluminium
4-) Customer Specification
Flange drilling : API Class 150, PN16, and Special
Flame element : Stainless steel AISI 316 –L or 304-L
O-ring seal : Nitrile, Special
Screen : Stainless steel
Weather hood : Carbon steel, Stainless steel or Aluminium
Paint finish 1-) Powder Coating, Colour RAL 9006
2-) Epoxy Paint, Colour RAL 9006
3-) Customer Specification
ATEX cert : Ex II 1/2 G IIB

Design & Manufacturing Specifications

The size of the vent should be calculated in accordance with API Standard 2000 (ISO 28300) - Venting Atmospheric and Low-Pressure Storage Tanks or other international standards.

Additional Information

Data sheet, Model 321 In-line Deflagration Flame Arrestor

As an easier connection veco system is available to be offered for in-line flame arrestor users.

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