In-Line Detonation Flame Arrester


Function and Description

The type PROTEGO® DA-UB in-line detonation flame arresters are the newest generation of flame arresters. Based on fluid dynamic and explosion-dynamic calculations, as well as decades of field tests, a line was developed that offers minimum pressure loss and maximum safety. The device uses the Shock Wave Guide Tube Effect (SWGTE) to separate the flame front and shock wave. The result is an in-line detonation flame arrester without a classic shock absorber, and the use of flame-extinguishing elements is minimized.


The devices are symmetrical and offer bi-directional flame arresting for deflagrations and stable and unstable detonations. The arrester essentially consists of two housing parts with an integrated shock tube and the PROTEGO® flame arrester unit in the center. The PROTEGO® flame arrester unit is modular and consists of several FLAMEFILTER® discs and spacers firmly held in a FLAMEFILTER® casing. The number of FLAMEFILTER® discs and their gap size depends on the arrester’s intended use.


By specifying the operating conditions, such as the temperature, pressure, explosion group, and the composition of the fluid, the optimum detonation arrester can be selected from a series of approved devices. PROTEGO® DA-UB flame arresters are available for explosion groups IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm).


The standard design can be used at an operating temperature of up to +60°C / 140°F and an absolute operating pressure up to 1.1 bar / 15.9 psi. Devices with special approval for higher temperatures and pressures are available upon request.


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


Features and Advantages:

Optimized performance due to the patented Shock Wave Guide Tube Effect (SWGTE)

Low number of FLAMEFILTER® discs due to the patented shock tube (SWGTE)

Modular design enables replacement of the individual FLAMEFILTER® discs

Different designs allow scalable pressure loss over the area of the FLAMEFILTER®

Maintenance-friendly design

Advanced design for higher operating temperatures and pressures

Bi-directional operation, as well as any flow direction and installation position

Installation of temperature sensors possible

Minimal pressure loss resulting in low operating and lifecycle costs

Cost-effective spare parts


Metrans Makina is the authorized Protego distributor in Turkey. Please contact for details.

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