ISO 20766-16:2022

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.