ISO 22760-6:2024/Amd 1:2025

Overview

ISO 22760-6:2024/Amd 1:2025 is an important amendment to the international standard governing Dimethyl Ether (DME) fuel system components for road vehicles. This part specifically addresses the Pressure Relief Valve (PRV), a critical safety component designed to manage overpressure conditions in DME fuel systems. Published by ISO in 2025, this amendment refines performance and testing requirements to enhance safety, reliability, and compatibility of PRVs within DME fuel systems.

Developed by ISO/TC 22 (Road Vehicles) and SC 41 (Specific aspects for gaseous fuels), the amendment supports advancements in alternative fuel technologies focusing on DME-a promising eco-friendly fuel with wide applications in transportation.

Key Topics

This amendment introduces and updates several technical aspects critical to ensuring the safe operation of Pressure Relief Valves used in DME fuel systems:

• Flow Capacity Definition
  The amendment formally defines flow capacity as the relieving capacity of a PRV measured at specific conditions (flow-rating pressure, 15.6 °C, 100 kPa).

• Additional Requirements in Valve Specifications
  New mandatory specifications include:

  • Flow capacity measurement
  • Type of fuel compatibility considerations

• Extensive Testing Protocols
  Updated testing requirements now cover:

  • Hydrostatic strength and leakage tests
  • Excess torque resistance and bending moment evaluations
  • Continued operation performance
  • Corrosion resistance and vibration resistance tests
  • Compatibility with brass and non-metallic materials
  • Oxygen ageing, ozone ageing, and dry heat resistance
  • Temperature cycle, flow capacity, and creep tests

• New Flow Capacity Test Procedure
  Testing at 120% of the maximum set pressure ensures PRVs maintain minimum flow capacity (calculated with a provided formula based on container surface area). This guarantees PRVs will efficiently relieve pressure without abnormal operational issues such as chattering.

• Creep Test Introduction
  Non-metallic parts exposed to high hydraulic pressure at elevated temperatures are tested for leakage post-exposure, verifying long-term durability and safety.

Applications

ISO 22760-6:2024/Amd 1:2025 plays a vital role in the design, manufacturing, and quality assurance of DME fuel system components for road vehicles. Its implementation is essential to:

• Automotive Manufacturers and Suppliers
  Ensure DME fuel system PRVs meet international safety and performance standards, promoting global market access.

• Safety and Compliance Testing Facilities
  Adopt rigorous test methods to certify component reliability under real-world conditions.

• Research and Development Teams
  Utilize standardized testing data to enhance durability and operational safety of new DME fuel system designs.

• Regulatory Authorities and Certification Bodies
  Rely on harmonized standards for validating fuel system safety and environmental compliance in alternative fuel vehicles.

Related Standards

ISO 22760-6:2024/Amd 1:2025 complements and refers to other parts of the ISO 22760 series, which collectively cover all aspects of DME fuel system components for road vehicles. Essential related standards include:

• ISO 22760-2: General requirements and test procedures for DME fuel system components
  Many specific tests in this amendment reference or extend requirements defined in this foundational part.

• ISO/IEC Directives, Part 1 and Part 2
  Provide the editorial and procedural framework for developing and maintaining ISO standards.

• Other ISO Standards for Gaseous Fuels and Automotive Safety
  Cover safety requirements for alternative fuels, materials compatibility, and system integrity tests.

Keywords: ISO 22760-6, Dimethyl Ether, DME fuel system, Pressure Relief Valve, PRV, automotive fuel safety, overpressure valve, fuel system standards, DME testing procedures, flow capacity test, creep test, fuel system components compliance