ISO 20766-16:2022

Road vehicles - Liquefied petroleum gas (LPG) fuel system components - Part 16: Injectors and gas mixing device/fuel rail

This document specifies general requirements for the injectors and gas mixing device/fuel rail, components of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It also provides general design principles and specifies requirements for instructions and marking. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using gaseous fuels in accordance with ISO 9162. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of the ISO 20766 series, including testing to the appropriate functional tests. All references to pressure in this document are considered gauge pressures unless otherwise specified. This document applies to devices which have a service pressure in the range of 110 kPa (butane rich at 20 °C) and 840 kPa (propane at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).

Véhicules routiers — Équipements pour véhicules utilisant le gaz de pétrole liquéfié (GPL) comme combustible — Partie 16: Injecteurs et mélangeur de gaz / rampe de combustible

General Information

• Status: Published
• Publication Date: 03-Jan-2022
• 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 6 - Fuel system components and refuelling connector for vehicles propelled by Liquefied Petroleum Gas (LPG)
• Current Stage: 6060 - International Standard published
• Start Date: 04-Jan-2022
• Due Date: 13-Mar-2022
• Completion Date: 04-Jan-2022

Overview

ISO 20766-16:2022 specifies general requirements for injectors and gas mixing devices/fuel rails used in liquefied petroleum gas (LPG) road-vehicle fuel systems (as defined in ISO 3833). The document covers design principles, marking and instructions, and the applicable tests needed to demonstrate safety, performance and traceability for mono-fuel, bi-fuel and dual-fuel vehicle applications that use gaseous fuels in accordance with ISO 9162. All pressure references are gauge pressures unless otherwise stated. The standard applies to devices with service pressures in the range of 110 kPa to 840 kPa (but can be scaled to other pressures by ratio).

Key Topics

• Scope and applicability: Components covered are injectors and gas-mixing device/fuel rail assemblies. Exclusions include fuel containers, stationary gas engines, container mounting hardware, electronic fuel management and refuelling receptacles.
• Markings and traceability: Components shall be marked to allow tracing of the manufacturer/agent, model/part number, working pressure (or working pressure and temperature range) and direction of flow where relevant. Recommended additional markings include fuel type, electrical ratings, certification symbol, approval number and serial/date code.
• Construction and assembly: Components must comply with the general requirements in ISO 20766-1 and the test methods in ISO 20766-2 and meet the tests specified in Clause 6 of this part.
• Required tests: The standard references and prescribes specific functional tests, including:
  • Hydrostatic strength (test pressure = 2.25 × working pressure)
  • Leakage tests at defined temperatures and pressure factors (low, ambient and high temperature checks)
  • Continued operation endurance (pulsing at working pressure with minimum pulse frequency)
  • Insulation resistance (500 V d.c. for typical connectors; 100 V d.c. for fine-pitch circuitry) with minimum allowable resistance > 10 MΩ
  • Minimum opening voltage requirements (≤ 8 V for 12 V systems, ≤ 16 V for 24 V systems) with components pressurized at 0.75 × working pressure

Applications

• Automotive manufacturers and system suppliers specifying or validating LPG injectors and fuel rails for passenger cars, light commercial vehicles and other vehicle types defined in ISO 3833.
• Component designers and test laboratories using prescribed procedures from ISO 20766-2 to verify strength, leakage, electrical insulation and operational durability.
• Regulatory and approval bodies assessing component marking, traceability and compliance with LPG fuel-system safety and performance expectations.

Related Standards

• ISO 20766-1 - General requirements and definitions for LPG fuel-system components
• ISO 20766-2:2018 - Performance and general test methods referenced by this part
• ISO 9162 - Specifications for liquefied petroleum gases (fuels)
• ISO 3833 - Vehicle types, terms and definitions

This part of ISO 20766 helps ensure consistency, safety and performance for LPG injectors and gas-mixing devices/fuel rails through defined marking, design guidance and standardized testing.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 20766-16
First edition
2022-01
Road vehicles — Liquefied petroleum
gas (LPG) fuel system components —
Part 16:
Injectors and gas mixing device/fuel
rail
Véhicules routiers — Équipements pour véhicules utilisant le gaz de
pétrole liquéfié (GPL) comme combustible —
Partie 16: Injecteurs et mélangeur de gaz / rampe de combustible
Reference number
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Markings . 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
6.5 Insulation resistance. 3
6.6 Minimum opening voltage . . 4
Bibliography . 5
iii
Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road Vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
A list of all parts in the ISO 20766 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.
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INTERNATIONAL STANDARD ISO 20766-16:2022(E)
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