ISO 22760-2:2019

Overview

ISO 22760-2:2019 - "Road vehicles - Dimethyl Ether (DME) fuel system components - Part 2: Performance and general test methods" defines performance and general test methods for fuel system components that are in contact with Dimethyl Ether (DME) on road vehicles (types defined in ISO 3833). It applies to mono‑fuel, bi‑fuel and dual‑fuel vehicle applications using DME in accordance with ISO 16861 and ASTM D7901. The standard excludes fuel containers, stationary gas engines, container‑mounting hardware, electronic fuel management and refuelling receptacles.

Key topics and technical requirements

ISO 22760-2 prescribes laboratory and bench test methods and general conditions for component qualification, including:

• Hydrostatic strength
  • Pressure ramp to failure; benchmark values; requirement that untested samples withstand at least 2.25× working pressure (based on a 1 500 kPa service reference).
• Leakage (external and internal)
  • Conditioning, pressurization and immersion/helium vacuum methods. Leakage acceptance: device must be bubble‑free or show leakage below the specified rate (see Clause 6; baseline test uses 150% working pressure for conditioning).
• Mechanical loads and durability
  • Excess torque resistance, bending moment and continued operation (duty cycles).
• Environmental and ageing tests
  • Corrosion (salt spray), oxygen ageing, ozone ageing, resistance to dry heat, temperature cycling and thermal‑cycling procedures.
• Material compatibility and electrical tests
  • Non‑metallic material immersion, brass compatibility, vibration resistance, insulation resistance, creep behaviour, electrical overvoltage exposure.
• Fluid compatibility
  • Compatibility with heat‑exchange fluids and automotive fluids; prescribed test fluids and pass criteria for exposure (Clause 22).

General test conditions are defined (room temperature 20 °C ± 5 °C; gauge pressures unless otherwise stated; use of dry air or nitrogen unless DME testing is required).

Practical applications and users

This standard is essential for:

• OEM vehicle and engine designers specifying DME fuel system components.
• Component manufacturers (valves, hoses, fittings, regulators, sensors) conducting design verification and type approval testing.
• Independent test laboratories performing standardized performance and durability tests.
• Regulatory and certification bodies assessing conformity of DME fuel system components for road vehicles.

Using ISO 22760-2 helps ensure safety, interchangeability and long‑term reliability of DME fuel system components under pressure, thermal and chemical stresses.

Related standards

• ISO 22760-1 (general requirements and definitions)
• ISO 16861 and ASTM D7901 (DME fuel specifications)
• ISO 3833 (vehicle types)
• Supporting material and test standards: ISO 188, ISO 1431-1, ISO 1817, ISO 9227, IEC 68-2-52

Keywords: ISO 22760-2, DME fuel system components, Dimethyl Ether, performance test methods, road vehicle fuel systems, leakage test, hydrostatic strength, component compatibility.