ISO 20766-1:2018

Overview - ISO 20766-1:2018 (LPG fuel systems components)

ISO 20766-1:2018 specifies general requirements and definitions for components used in liquefied petroleum gas (LPG) fuel systems for road vehicles. It applies to vehicles defined by ISO 3833 and to mono‑fuel, bi‑fuel or dual‑fuel applications using gaseous fuels in accordance with ISO 9162. The standard sets out design principles, marking and instruction requirements, material and construction expectations, electrical wiring rules, and terminology for LPG system components (excluding certain items listed in the scope).

Key topics and technical requirements

• Scope and applicability
  • Covers on‑board components for LPG vehicle systems (not applicable to fuel containers, stationary gas engines, container mounting hardware, electronic fuel management, or refuelling receptacles).
  • References service pressure range: 110 kPa (butane‑rich @20 °C) to 840 kPa (propane‑rich @20 °C); pressures are gauge pressures unless stated otherwise.
• Terms and definitions
  • Standardizes component definitions (valves, pressure relief devices, vaporizers, pressure regulators, injectors, hoses, rigid lines, multivalves, etc.).
• Construction and materials
  • Materials must be suitable for LPG and able to withstand specified temperature ranges (e.g., on‑board moderate: −20 to 120 °C; cold: −40 to 120 °C; container accessories: −20 to 65 °C, etc.).
  • Non‑metallic materials must pass oxygen ageing and immersion tests per ISO 20766‑2; corrosion resistance requirements also referenced.
• Assembly and threads
  • Joints must be gas‑tight; threads for container‑attached components must meet international standards for LPG container ports.
• Electrical equipment and wiring
  • Wiring and components must comply with ISO 6722‑1/‑2 for insulation, mechanical strength and current capacity; openings must prevent chafing.
• Instructions and marking
  • Manufacturers must supply clear installation/maintenance instructions in the destination language.
  • Permanent marking requirements include manufacturer ID, part number, working pressure/temperature ranges, flow direction, fuel type, electrical ratings, certification symbol/type approval, serial/date code, and ISO 20766 part reference.

Applications and users

• Intended for automotive OEMs, LPG component manufacturers, certification bodies, testing laboratories, installers and maintenance technicians, and regulators involved in vehicle conversion or production.
• Practical uses: product design validation, component selection, conformity testing, installation guidance, and regulatory compliance for LPG vehicle systems.

Related standards

• ISO 3833 - vehicle types, terms and definitions
• ISO 9162 - gaseous fuels for vehicles
• ISO 6722‑1 / ISO 6722‑2 - road vehicle single‑core cable requirements
• Other parts of ISO 20766 (e.g., ISO 20766‑2, ISO 20766‑3) - material tests and specific component functional requirements

Keywords: ISO 20766-1:2018, LPG fuel systems, liquefied petroleum gas, road vehicles, component requirements, marking, instructions, service pressure.