ISO 20766-2:2018

Overview

ISO 20766-2:2018 - Road vehicles: Liquefied petroleum gas (LPG) fuel system components - Part 2 defines performance and general test methods for LPG fuel-system components used on motor vehicles (mono-fuel, bi-fuel or dual-fuel) per ISO 3833 and ISO 9162. It covers test procedures, environmental and mechanical conditioning, and acceptance criteria for components operating in typical LPG service-pressure ranges. The standard excludes fuel containers, stationary gas engines, container mounting hardware, electronic fuel management and refuelling receptacles.

Key topics and technical requirements

• Scope & applicability
  • Components for vehicle LPG systems operating within defined service-pressure ranges (document provides guidance on pressure ratios and gauge-pressure references).
  • Tests normally performed using dry air or nitrogen; LPG may be used with appropriate safety measures.
• Mechanical strength
  • Hydrostatic strength test with progressive pressurization; benchmark and pass/fail criteria relative to working pressure (document specifies multiplier factors).
  • Excess torque resistance and bending moment tests to verify mechanical integrity at installation loads.
• Leakage testing
  • Procedures for external and internal leakage (immersion, bubble detection or vacuum/helium methods) after conditioning; components are pre-pressurized and conditioned at defined temperatures before measurement.
• Durability & environmental conditioning
  • Continued operation and duty-cycle tests including room, high- and low-temperature cycling.
  • Corrosion resistance, salt-mist cyclic testing and brass material compatibility.
  • Ageing tests for non-metallic materials (oxygen, ozone), dry-heat, temperature cycling, creep and vibration resistance.
• Electrical and chemical exposure
  • Electrical overvoltage and insulation resistance checks where applicable.
  • Immersion and automotive fluids exposure tests for non-metallic parts, plus compatibility with heat-exchange fluids.

Practical applications - who uses this standard

• Component manufacturers designing LPG valves, regulators, fittings and hoses to prove performance and safety.
• OEMs and vehicle integrators specifying supplier requirements for LPG systems in cars, vans and light commercial vehicles.
• Test laboratories and certification bodies performing compliance, type approval and routine qualification testing.
• Safety and quality engineers assessing durability, leakage risk and environmental resistance during R&D and production validation.

Related standards (selection)

• ISO 20766-1 (terms/definitions and part-series context)
• ISO 3833 (vehicle classification)
• ISO 9162 (LPG quality/specification)
• ISO 188 / ISO 1817 / ISO 9227 / ISO 1431-1 / IEC 60068-2-52 (referenced test-method standards)

Keywords: ISO 20766-2, LPG fuel systems, LPG component testing, hydrostatic strength, leakage testing, automotive gas systems, performance test methods.