BS ISO 15500‑19:2020 Road vehicles — Compressed natural gas (CNG) fuel system components.
I Scope
This document specifies tests and requirements for fittings, compressed natural gas (CNG) fuel system components 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 series.
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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 15500-1, Road vehicles — Compressed natural gas (CNG fuel system components — Part 1: General requirements and definitions
ISO 15500-2:2016, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2:
Performance and general test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given ISO 15500-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
6.2 Hydrostatic strength
Test the fitting according to the procedure for testing hydrostatic strength specified in ISO 15500-2. The test pressure shall be four times the working pressure.
NOTE The higher hydrostatic test pressure for the fittings compared to the other components in the other parts of the ISO 15500 series is due to consistency with fuel line provisions.
6.3 Continued operation
Test the fitting in accordance with the procedure for testing continued operation given in LS 15500-2 for a total of 100 000 cycles. The fitting shall only be tested while connected with a rigid fuel line.
Following cycling testing. perform the leak test specified by ISO 15500-2. then the hydrostatic strength test in accordance with 2.
6.4 Pull off
Test the fitting, attached to its rigid fuel line and coupled to its mating part or parts, according to the following procedure and acceptance criterion. Secure the subject specimen in an appropriate test fixture, then statically apply a tensile load along the rigid fuel line axis at a maximum rate of 250 N/mm until the rigid fuel line separates from the fitting.
BS ISO 15500‑19 pdf download.