ISO 22760-9:2024

Overview

ISO 22760-9:2024 specifies the definitions and general requirements for pressure relief devices (PRDs) in dimethyl ether (DME) fuel system components for road vehicles. This standard ensures that PRDs effectively limit internal pressure within DME fuel containers intended exclusively for motor vehicles as outlined in ISO 3833. The document defines PRD performance, design, marking, testing, and instructional requirements, directly supporting robust safety measures in DME-fueled road vehicles using gaseous fuels as per ISO 16861.

The scope of ISO 22760-9:2024 does not include PRDs for stationary engines, marine or rail installations, aircraft, fuel container mounting hardware, or electronic fuel management systems. It provides comprehensive guidance for manufacturers, automotive engineers, regulatory authorities, and automotive testing professionals involved with DME vehicle technology and gaseous fuel systems.

Key Topics

• Definitions and Functional Requirements
  Clarifies essential terms, such as rupture pressure and activation temperature, ensuring a uniform understanding for manufacturers and regulators.

• Marking and Traceability
  Stipulates marking requirements on PRDs, including manufacturer details, model designation, working pressure, and activation data, to ensure product traceability and correct installation in DME systems.

• Design and Assembly Principles
  Outlines design criteria and assembly rules, referencing general DME system standards to maintain safety and system integrity.

• Testing Protocols
  Details multiple rigorous tests for PRDs, including:

  • Hydrostatic strength
  • Leakage under various pressures and temperatures
  • Mechanical durability (bending, bending moment testing)
  • Continued operation and accelerated life assessment
  • Activation verification (benchtop tests)
  • Thermal cycling and condensate corrosion resistance
  • Flow capacity

• Production Batch Inspection
  Requires ongoing batch inspection and acceptance testing, supporting consistent, long-term safety performance.

Applications

ISO 22760-9:2024 is applicable in contexts such as:

• Design and Manufacturing of DME Fuel Systems
  Guides component designers and manufacturers in producing PRDs that reliably protect against over-pressure incidents in DME containers used in road vehicles.

• Regulatory Compliance and Certification
  Forms a basis for industry compliance, certification, and type approval processes, ensuring PRDs meet recognized international safety benchmarks.

• Vehicle Maintenance and Aftermarket
  Supports maintenance professionals in identifying compliant PRDs and replacing components with certified devices, contributing to vehicle and occupant safety.

• Automotive Testing and R&D
  Reference for laboratories and R&D teams in evaluating performance and conducting conformity assessments on DME PRDs according to ISO protocols.

This standard is vital for organizations developing or certifying alternative fuel transport solutions and those involved in the broader adoption of sustainable gaseous fuel technologies in the automotive industry.

Related Standards

For comprehensive implementation, reference these related standards:

• ISO 22760-1: General requirements and definitions for DME fuel system components
• ISO 22760-2: Performance and general test methods for DME system parts
• ISO 16861: Specifications for DME fuels
• ISO 3833: Types of road vehicles
• ISO 20760 series: Additional requirements and functional testing for DME components

Additional standards relevant to testing and compatibility include:

• ISO 11114-2: Compatibility of cylinder and valve materials with gas contents
• EN 10204: Inspection documents for metallic products
• ASTM D7901: Dimethyl ether for fuel purposes

By adhering to ISO 22760-9:2024 with these associated standards, stakeholders in the automotive and fuel system industries can ensure the safe, reliable deployment of DME-fueled vehicles worldwide.