More Explosion Protection Equipment

“Explosion protection equipment for compliance and safety”

IEP Explosion Flap Valve

IEP Technologies Explosion Isolation Flap Valve.


Explosion Isolation Flap Valves

 The passive explosion isolation flap valve is a reliable cost-effective explosion isolation solution that acts as a check valve preventing backflow, mitigating explosion propagation risks to upstream equipment. The cylindrical design allows it to be installed on any round duct diameter size ahead of any process vessel that contains a combustible dust hazard. The valve includes a flap blade which is held open by process airflow and closes upon self-activation and locking the blade in place. Also included is the flap sensor, accumulation sensor, and interface module that communicates with the main shutdown controls.  The flap valve meets the requirements of OSHA Combustible Dust Directive, NFPA 654, NFPA 69 latest edition, and EU ATEX Directive compliance.

Explosion Vents

Explosion vents, also known as explosion panels or rupture panels, are fixed to process vessels such as dust collectors or material storage silos. Explosion vents are designed to rupture (open) from the pressure developed by the explosion. The opened vent relieves the flame front, pressure, and heat from the vessel while preventing the vessel from exploding into pieces.

Explosion vents are applied when a vessel is outside or inside, if against an outside wall. Engineers use the combustible dust characteristics (Pmax & KST), pressure reduced (Pred) of the vessel, and the volume of the dirty area to calculate the vent surface area required.  Explosion vents, if applicable, are cost-effective and usually less expensive than most other explosion control methods used with process equipment.

Explosion Vents on a silo and a dust collector.

Typical Applications for Explosion Vents on a Storage Silo and a Dust Collector.

IEP Technologies Model EVN Flameless Explosion Vent

IEP Technologies Model EVN Flameless Explosion Vent on a Vacuum Receiver.

Flameless Explosion Vents

Like explosion vents, flameless explosion vents relieve the process vessel of heat, pressure, and flame, but Flameless Explosion Vents are designed with an integral flame arrester that arrests the flames as they exit the vessel through the vent. This means only heat and pressure are released when the valve is open.   The flame arrester allows flameless vents to be installed on process vessels located indoors or in outdoor applications where explosion venting can’t be safely achieved. There are a few different styles of flameless vents. There is a flameless vent that opens upon pressure and automatically reseals. There is also the non-closing flameless vent that opens upon pressure and stays open until it’s manually reset. Typically, the non-closing flameless vent is used in conjunction with the inlet isolation flap valve. Like explosion vents, engineers use the same calculation in NFPA 68 to generate the vent area size required.

Hopper Explosion Isolation

Isolating the hopper outlet is required to prevent the escape of gas and flame from the bottom of the vessel.  This is accomplished by an approved rotary airlock or an outlet Drum Kit.  The drum kit is attached to the hopper outlet and acts as an extension of the dust collector or vessel hopper. The drum kit, which is a passive solution to combustible dust protection,  includes a spool piece that bolts to the hopper outlet, a hydraulic lift rated to 800 pounds, and a drum band clamp.  The hydraulic lift makes moving the filled drum much easier and less strenuous for the operator. These kits meet NFPA compliant 3rd party testing to 14 psi.  

losion Isolation options on a dust collector hopper.

Explosion Isolation at the vessel outlet, either with a rotary airlock or drum kit option.