BS EN 16447:2014

What is BS EN 16447 - Explosion isolation flap valves about?  

BS EN 16447 describes the general requirements for flap valves used for dust explosion isolation. An explosion isolation flap valve is a protective system, which prevents a dust explosion from propagating via connecting pipes or ducts into other parts of apparatus or plant areas. An explosion isolation flap valve can only stop the propagation of a dust explosion when it propagates against the direction of the normal process flow. It does not stop explosions running in the normal process flow direction. BS EN 16447 specifies methods for evaluating the efficacy of explosion isolation flap valves. 

BS EN 16447 is applicable only to explosion isolation flap valves which are intended to avoid explosion propagation from a vessel, into other parts of the installation via connecting pipes or ducts. BS EN 16447 covers isolation of such vessels that are protected by explosion venting (including flameless venting), explosion suppression or explosion resistant design. 

Explosion isolation flap valves are not designed to prevent the transmission of fire or burning powder transported by the normal process flow. BS EN 16447 is only applicable for dust explosions. 

BS EN 16447 is not applicable for explosions of materials listed below, or for mixtures containing some of those materials: 

• Gases, vapours and hybrid mixtures 
• Chemically unstable substances 
• Explosive substances 
• Pyrotechnic substances 

Note 1: BS EN 16447 is only applicable to cases where the explosion starts in a vessel and not in pipes or ducting. 

Note 2: It is necessary to take this into account in risk assessments. 

Who is BS EN 16447 - Explosion isolation flap valves for? 

BS EN 16447 on explosion isolation flap valves is useful for: 

• The pharmaceutical industry 
• The chemical industry 

• The food industry 
• Explosion isolation flap valves manufacturers 
• Quality control personnel 

Why should you use BS EN 16447 - Explosion isolation flap valves?  

BS EN 16447 guides the manufacturers with test methods for the flap valve that reduces the risk of dust explosions with isolation. It is installed such that the normal process airflow passes in one direction through the valve and keeps it open. It closes when the airflow reverses due to a dust explosion event. The valve shall stay closed long enough to avoid flames from transmitting during an explosion event. Explosion isolation shall also be ensured during periods without process flow. Using BS EN 16447 guidelines you can test the efficiency of the explosion isolation flap valves and ensure durability and high-quality products.