ISO 22760-6:2024/Amd 1:2025

Overview

ISO 22760-6:2024/Amd 1:2025 is an amendment to the international standard concerning pressure relief valves (PRV) used in road vehicles equipped with Dimethyl Ether (DME) fuel systems. Developed by the International Organization for Standardization (ISO), this amendment provides important updates for the safety, performance, and testing of PRVs as part of the overall ISO 22760 series aimed at DME fuel system components. The standard is intended for vehicle manufacturers, component suppliers, and testing laboratories involved in the design, production, and evaluation of DME fuel system components.

Key Topics

This amendment introduces several significant updates and clarifications related to DME pressure relief valves in automotive applications:

• Flow Capacity: Clearly defines "flow capacity" as the measured relieving capacity of a PRV, expressed in cubic meters per minute of air at specified conditions.
• Product Data Requirements: Adds requirements to include flow capacity and fuel type within the product data sheet.
• Test Requirements: Updates and consolidates the list of applicable tests, referencing procedures from ISO 22760-2 and providing additional performance benchmarks for critical properties such as leak resistance, strength, operational durability, and flow capacity.
• Flow Capacity Test: Specifies that each PRV sample must be tested at 120% of the maximum set pressure. The minimum flow capacity is defined, and the results must be consistent within 10% across samples.
• Creep Test: Introduces a procedure where non-metallic parts are subjected to high pressure and temperature over 96 hours, followed by leak testing, to verify long-term durability under extreme operating conditions.

Applications

This amendment is particularly relevant for the following applications:

• Automotive Manufacturing: Ensures that safety valves within DME fuel systems perform reliably under real-world stress and comply with updated international safety requirements.
• Component Design and Testing: Provides technical guidelines for manufacturers developing PRVs, facilitating standardized testing for attributes such as flow capacity, resistance to corrosion, vibration, and extreme temperatures.
• Regulatory Compliance: Offers a benchmark for demonstrating compliance with national and international regulations on alternative fuel vehicle safety.
• Quality Assurance: Enables quality control teams to verify that components meet the revised performance criteria, thus reducing risks of hazardous failures or operational malfunctions in road vehicles using DME fuel.

Related Standards

For comprehensive compliance and integration, this amendment should be used alongside other relevant standards in the ISO 22760 series and those dealing with gaseous fuel systems in road vehicles:

• ISO 22760-2: Road vehicles - DME fuel system components - Part 2: General test methods
• ISO 22760 series: Covers various aspects of DME fuel system components for road vehicles
• ISO/TC 22/SC 41: The technical committee responsible for gaseous fuels in road vehicles

For updates, full lists of related parts, and the latest guidance for implementation and conformity assessment, refer to the official ISO website.

Keywords: ISO 22760-6:2024/Amd 1:2025, road vehicles, Dimethyl Ether, DME, pressure relief valve, PRV, fuel system components, automotive safety, flow capacity test, creep test, standardization, ISO compliance, alternative fuels.