Skip to main content


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

  • endurance burning protection for alcohols and hydrocarbons up to explosion group IIB3
  • specially developed for inland navigation vessels and on shore systems
  • weather hood protects against environmental impact (i.e. weather, bird nests, etc.)
  • weather hood will open and signal the impact of a flame
  • fusible link is resistant against chemicals
  • modular design allows replacement of single FLAMEFILTER®
  • easy maintenance
  • protection against atmospheric deflagration and endurance burning
  • modular design results in low spare part cost

Function and Description

The PROTEGO® BE-HK-E-IIB3 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. Main application area is on suction and vent lines, for inland navigation vessels and on shore systems with the goal to prevent flame transmission caused by endurance burning or atmospheric deflagration.

The PROTEGO® BE-HK-E-IIB3 consists of a 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 fusible link (5), located in a center position, will melt and let the spring loaded weather hood move into the open position. 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 hydrocarbons for explosion group IIB3 (MESG ≥ 0,65 mm) and alcohols.

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

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

Approved according to IMO MSC/Circular 677 as well as IMO MSC.1/Circular 1324 and 1325.


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

DN80 / 3"
a218 / 8.58
b200 / 7.87
Dimensions in mm / inches Dimensions for deflagration flame arrester with heating jacket upon request

Material selection for housing

Design BCD
Housing Steel Stainless SteelHastelloy
Weather Hood Steel Stainless Steel Stainless Steel / ECTFE
Flame arrester unitAA, CC
Special materials upon request

Material combinations of flame arrester unit

Design AC
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)
≥ 0,65 mmIIB3C
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”.