ISO 15500-21:2023 PDF

Scope: 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.

ISO 15500-21:2023 Referenced Document

ISO 15500-1 Road vehicles - Compressed natural gas (CNG) fuel system components - Part 1: General requirements and definitions
ISO 15500-2 Road vehicles - Compressed natural gas (CNG) fuel system components - Part 2: Performance and general test methods

2023 ISO 15500-21:2023 Road vehicles — Compressed natural gas (CNG) fuel system components — Part 21: Discharge line closures