In-Line Deflagration Flame Arresters, ATEX / CE / ISO

45000E / 46000E

Gas Groups:
45000E – IIA | D
46000E – IIA, IIB3 | D, C 

Protectoseal Series 45000E and 46000E In-Line Deflagration Flame Arresters are designed to withstand low, medium and high pressure deflagrations (subsonic). These arresters are bi-directional and capable of stopping a flame approaching from either direction in a piping system and can be mounted vertically or horizontally in the pipeline. Suitable for varying distances from the unprotected side of the vent pipe, maximum distance (Lu/D=50), and within determined operating pressure, consult factory for specifics. These arresters prevent confined deflagrations from passing the arrester and entering a protected area. 



  • Bi-directional design stops a flame approaching from either direction in a piping system
  • Crimped metal arrester element minimizes pressure drops and reduces overall weight
  • Straight through flow pattern minimizes arrester element fouling and simplifies the cleaning process
  • Removable and interchangeable arrester element facilitates ease of inspection and maintenance
  • High strength, welded steel housing hydrostatically tested at 235 PSIG
  • Pressure retaining housing components are welded in accordance with ASME Pressure Vessel Code, Section IX requirements
  • Sizes45000E – DN 50 (2”) through DN 300 (12”)46000E – DN 50 (2”) through DN 100 (4”) 
  • Flanged to mate with standard flanged 150# ANSI or DIN PN16 connections 
  • Maximum Initial Pressure: 45000E – 1.1 – 1.3 bara (15.95 – 18.85 PSIA)*46000E – 1.1 – 1.6 bara (15.95-23.21 PSIA)* (*varies based size, see spec sheet for details)  
  • Maximum Initial Temperature: 60 C (140 F) 
  • Housing Configuration: Concentric 
  • Materials: Carbon SteelStainless Steel and Alloy C276 
  • Gas Groups45000E  IEC Explosion Group IIA | NEC Group D; 46000E – IEC / ISO Explosion Group IIA, IIB3 | NEC Group D, C 
  • Testing & Certifications: Approved according to the latest ATEX Directive, ISO 16852 
  • Connections: Other drilling patterns available upon request.  
  • Materials certifications for castings 
  • Connections for drains, pressure taps or temperature probes available upon request 
  • Temperature probe kits available for short time burn rating