ISO 15500-21:2023

This document specifies tests and requirements for discharge lines closures, 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 the 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.