Explosion relief (venting)
Explosion relief consists in taking out explosion effects (mainly pressure), through a venting system, outside the protected device. As a result, the pressure inside the device is reduced to a safe level.
Three basic types of relieving systems are available in the market, i.e. decompression panels, dampers with a self-closing mechanism and the so called flameless relieving systems. The latter – due to their special design – can be applied indoors. Others systems should be applied outdoors due to a direct outburst of the explosion wave to atmosphere.
Scope of works performed
- Calculations of a minimum decompression area,
- Delivery and assembly,
- Overhauls and service.
Decompression panels are simple yet effective protections against explosion, mainly intended for open spaces. Each installed decompression panel requires a hazardous zone perimeters to be set out; depending on the application specifics, the perimeter can range up to dozens of metres outward.
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Heavy-duty decompression panels:
- BT-ODV (U), BT, BT-VSI three-ply safety membrane
- EDP single-membrane relief panel
- EX-GO-VENT (EGV) single-membrane relief panel
- ERO single-membrane relief panel
- SK / BIRD membrane rupture indicator
The decompression panels are simple and reliable explosion protection solutions. However, a number of restrictions can make their applications limited or outright infeasible. Selection of this solution for specific applications requires careful consideration.
Flameless explosion venting system
A flameless explosion venting system is unique in design which can be applied in indoor rooms and dense installations. The system minimises the risk of fire following an explosion.
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The EVN type explosion relief valves are protective systems as defined in the ATEX Directive. The EVN 2.0 type explosion relief valves have been tested for performance with the following dust groups: starch, plastic, resin, toner, sugar, wood, MDF, cellulose (fibrous dust), coal, and peat.
The Q-ROHR-3 system provides flameless explosion venting for nearby equipment units, instruments and personnel. The solution protects processing instruments which are in hazard of explosion and installed in large buildings or outdoor, potentially with personnel nearby, as well as for explosion protection of silo vessels, cyclone separators and air filters. A major group of those installations include sterile / clean-room compliant applications.
The Q-ROHR-3 system provides flameless explosion venting for nearby equipment units, devices and personnel. The solution protects processing devices which are in hazard of explosion and installed in large buildings or outdoor, potentially with personnel nearby, as well as for explosion protection of silo vessels, cyclone separators and air filters. A major group of those installations include sterile / clean-room compliant applications.
Explosion relief dampers
Explosion relief dampers close themselves automatically once an explosion is vented to isolate the supply of air and prevent post-explosion fire. This protection is most often applied in coal dust systems.
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TT‑Uni‑K round explosion relief dampers are used for protection of tanks and silos against damage from explosion by controlled relief and venting of explosion products into the atmosphere. The damper closes itself following an explosion relief action (the damper isolates the flow of air).
The RLE-S square explosion relief dampers provide protection from explosion. The most usual applications include protection of filters, electrostatic precipitators and drying units against damage from explosion. The damper system closes itself following an explosion relief action and isolates the flow of air.