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Deflagration Flame Arrester, endurance burning proof, End-of-Line

  • endurance burning protection for alcohols and hydrocarbons with MESG ≥ 0,85mm
  • weather hood protects the PROTEGO® flame arrester unit against environmental impact, such as nesting animals and weather conditions
  • in case of fire, the weather hood opens, allowing the flame to be seen from a far distance
  • centrally aligned melting element is resistant to chemicals
  • modular design enables replacement of individual FLAMEFILTER® discs
  • trouble-free maintenance
  • provides protection against atmospheric deflagrations and endurance burning
  • cost-effective spare parts

Function and Description

The PROTEGO® BE/HK-E end-of-line deflagration flame arrester was specifically developed for vessels which are not pressurized and store ethanol or other alcohols. The combustion of alcohol requires a modified flame arrester element design to provide protection against endurance burning. In addition, the device provides protection against atmospheric deflagration. It is typically installed on in-breathing and out-breathing vent lines to prevent flame transmission into the vessel or plant caused by endurance burning or atmospheric deflagration.

The PROTEGO® BE/HK-E consists of the housing (1), a weather hood (2), and the PROTEGO® flame arrester unit (3). During normal operation, the metal weather hood is in a closed position. If a stabilized flame burns on the flame arrester element surface, the melting element (5), located in a center position, will melt, and the spring-loaded weather hood will open. The PROTEGO® flame arrester unit consists of two FLAMEFILTER® discs (4) which are installed in a FLAMEFILTER® casing. The PROTEGO® BE/HK-E end-of-line deflagration flame arrester is available for alcohols and other substances with MESG ≥ 0,85mm.

The standard design can be used for operating temperatures up to +60°C / 140°F.

Type-approved in accordance with the current ATEX Directive and EN ISO 16852, as well as other international standards.


To select the nominal size (DN), please use the flow capacity charts on the following pages

DN20 / ¾"25 / 1"32 / 1¼"40 / 1½"50 / 2"65 / 2½"80 / 3"
a163 / 6.42163 / 6.42163 / 6.42183 / 7.20183 / 7.20218 / 8.58218 / 8.58
b180 / 7.09177 / 6.97177 / 6.97190 / 7.48190 / 7.48200 / 7.87200 / 7.87
Dimensions in mm / inches Dimensions for deflagration flame arrester with heating jacket upon request

Material selection for housing

Design BC
Housing Steel Stainless Steel
Weather Hood Steel Stainless Steel
Flame arrester unitAA, B
Special materials upon request

Material combinations of flame arrester unit

Design AB
FLAMEFILTER® cage Stainless Steel Stainless Steel
FLAMEFILTER® Stainless Steel Hastelloy
SpacerStainless SteelHastelloy
Special materials upon request

Selection of explosion group

MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
≥ 0,85 mmIIB1
Special approvals upon request

Flange connection type

EN 1092-1; Form B1
ASME B16.5 CL 150 R.F.
other connections upon request

Design Types and Specifications

There are two different designs:

End-of-line deflagration flame arrester, basic design

BE/HK-E - –

End-of-line deflagration flame arrester with heating jacket


Special designs available on request

Flow Capacity Chart

The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.