This document specifies tests and requirements for the pressure relief device (PRD), a compressed natural gas (CNG) fuel system component intended for use on the types of motor vehicles defined in ISO？3833.

This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using natural gas in accordance with ISO？15403-1.

It is not applicable to the following:

a)？liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer;

b)？fuel containers;

c)？stationary gas engines;

d)？container-mounting hardware;

e)？electronic fuel management;

f)？refuelling receptacles.