ISO 15500-3:2020

Road vehicles - Compressed natural gas (CNG) fuel system components - Part 3: Check valve

This document specifies tests and requirements for the check valve, 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 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.

Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 3: Valve de contrôle

General Information

• Status: Published
• Publication Date: 02-Aug-2020
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
• Drafting Committee: ISO/TC 22/SC 41/WG 3 - Fuel system components and refuelling connector for vehicles propelled by gaseous fuel
• Current Stage: 9092 - International Standard to be revised
• Start Date: 14-Feb-2023
• Completion Date: 13-Dec-2025

Relations

• Revises: ISO 15500-3:2012 - Road vehicles - Compressed natural gas (CNG) fuel system components - Part 3: Check valve
• Effective Date: 09-Jun-2018
• Revises: ISO 15500-3:2012/Amd 1:2016 - Road vehicles - Compressed natural gas (CNG) fuel system components - Part 3: Check valve - Amendment 1
• Effective Date: 09-Jun-2018

Overview

ISO 15500-3:2020 - "Road vehicles - Compressed natural gas (CNG) fuel system components - Part 3: Check valve" specifies tests and requirements for check valves used in CNG vehicle fuel systems. It applies to mono-fuel, bi-fuel and dual-fuel road vehicles (as defined in ISO 3833) using natural gas in accordance with the ISO 15403 series. The standard defines marking, construction/assembly expectations and mandatory test regimes to ensure safe, reliable CNG check valve performance.

Key topics and technical requirements

• Scope and exclusions
  • Applies to CNG check valves for road vehicles; not applicable to LNG upstream components, fuel containers, stationary engines, container-mounting hardware, electronic fuel management or refuelling receptacles.
• Marking
  • Components must be traceable with: manufacturer/agent name or trademark, model/part number, working pressure (and temperature range), and serial number or date code. Recommended additional markings include flow direction, fuel type and certification marks.
• Construction and assembly
  • Check valves shall comply with general provisions in ISO 15500-1 and test methods in ISO 15500-2; tolerances should follow ISO 15500-2.
• Mandatory tests
  • Hydrostatic strength: tested at 2.5 × working pressure (WP) per ISO 15500-2 procedure.
  • Leakage: tested at specified temperatures and pressure factors (examples include cold tests at −40 °C or −20 °C, ambient and elevated temperatures with pressure factors relative to WP).
  • Continued operation: check valves must withstand 20 000 operational cycles and 240 hours of chatter flow. The test sequence includes applying six inlet pressure pulses at either 125% service pressure or 100% WP with the outlet closed, venting the outlet between cycles, and limiting outlet-side pressure to ≤ 0.5 × WP prior to the next cycle. After durability, leakage and hydrostatic tests are repeated.
  • Additional applicable tests (as per ISO 15500-2) include corrosion, ageing, vibration, compatibility and other mechanical tests where relevant.

Applications and users

• Manufacturers of CNG check valves and fuel-system components seeking product design and conformity criteria.
• Automotive OEMs integrating CNG systems into vehicles (mono-, bi- and dual-fuel platforms).
• Test laboratories performing certification, durability and safety testing for CNG components.
• Regulators, certification bodies and suppliers ensuring compliance with CNG fuel-system safety and performance requirements.

Related standards

• ISO 15500-1 - General requirements and definitions for CNG fuel system components
• ISO 15500-2:2016 - Performance and general test methods (referenced for procedures)
• ISO 15403 series - Natural gas quality for vehicle fuel
• ISO 3833 - Road vehicle types, terms and definitions

Keywords: ISO 15500-3:2020, CNG check valve, compressed natural gas, check valve testing, hydrostatic strength, leakage test, continued operation, CNG fuel system standard.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 15500-3
Third edition
2020-08
Road vehicles — Compressed natural
gas (CNG) fuel system components —
Part 3:
Check valve
Véhicules routiers — Composants des systèmes de combustible gaz
naturel comprimé (GNC) —
Partie 3: Valve de contrôle
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . 2
5 Construction and assembly . 2
6 Tests . 2
6.1 Applicability . 2
6.2 Hydrostatic strength . 3
6.3 Leakage . 3
6.4 Continued operation . 3
Bibliography . 4
Foreword
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is o/ f or ewor d . ht m l .
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
This third edition cancels and replaces the second edition (ISO 15500-3:2012), which has been
technically revised. It also incorporates the Amendment ISO 15500-3:2012/Amd.1:2016. The main
changes compared to the previous edition are as follows:
— serial number or data code became mandatory in marking;
— update of continued operation clause.
A list of all parts in the ISO 15500 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

Introduction
For the purposes of this document, all fuel
...