prEN 16447 rev

Explosion isolation flap valves

General information

10.99 New project approved   Jul 10, 2023

CEN

CEN/TC 305 Potentially explosive atmospheres - Explosion prevention and protection

European Norm

Scope

This European Standard 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. This European Standard specifies methods for evaluating the efficacy of explosion isolation flap valves.
This European Standard is applicable only to the use of explosion isolation flap valves that are intended for avoiding explosion propagation from a vessel, into other parts of the installation via connecting pipes or ducts. The standard covers isolation of such vessels that are protected by explosion venting (including flameless venting), explosion suppression or explosion resistant design.
NOTE 1 The standard assumes that the explosion starts in a vessel and not in ducting.
Explosion isolation flap valves are not designed to prevent the transmission of fire or burning powder transported by the normal process flow.
NOTE 2 It is necessary to take this into account in risk assessments.
This European Standard is only applicable for dust explosions.
This European Standard is not applicable for explosions of materials listed below, or for mixtures containing some of those materials:
a) gases, vapours and hybrid mixtures;
b) chemically unstable substances;
c) explosive substances;
d) pyrotechnic substances.

Related legislation

Legislation related to this standard

2014/34/EU

Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)

Life cycle

PREVIOUSLY

PUBLISHED
EN 16447:2014

NOW

IN_DEVELOPMENT
prEN 16447 rev
10.99 New project approved
Jul 10, 2023