ISO 20766-22:2025 Overview
ISO 20766-22:2025 is an international standard developed by ISO that specifies requirements for power supply bushings used in liquefied petroleum gas (LPG) fuel system components in road vehicles. This part 22 of the ISO 20766 series focuses on power supply bushings related to fuel pumps, actuators, and fuel level sensors designed for motor vehicles as defined in ISO 3833. The document outlines general design principles, safety requirements, marking, and testing methods applicable to LPG fuel system components operating under specific pressure ranges.
This standard applies broadly to mono-fuel, bi-fuel, and dual-fuel vehicles utilizing gaseous fuels according to ISO 9162, but it excludes fuel containers, stationary gas engines, container mounting hardware, electronic fuel management, and refuelling receptacles. Devices covered typically operate within service pressures from 110 kPa (butane rich) to 840 kPa (propane rich).
Key Topics in ISO 20766-22:2025
-
Scope and Application
Defines the types of vehicles and fuel systems applicable, emphasizing LPG-powered road vehicles. The focus is on safety-critical power supply bushings serving fuel pumps, actuators, and sensors within LPG fuel systems.
-
Marking and Identification
Components must bear clear and indelible markings including manufacturer name, model number, working pressure and temperature ranges, fabrication date, and electrical ratings if relevant. Recommended markings include fuel type, certification symbols, type approval numbers, and references to this ISO document.
-
Construction and Assembly Requirements
The power supply bushing must resist maximum operating pressures and temperature ranges without compromise. Electrical safety is critical, so insulation requirements to prevent sparks are emphasized, including isolation resistance above 10 MΩ and system isolation from the vehicle body. Hermetic sealing to ensure tight and isolated electrical connections is mandatory.
-
Testing Procedures
The standard mandates rigorous testing, including:
- Hydrostatic strength testing at 2.25 times working pressure inside the LPG tank
- Leakage, temperature (high/low), and corrosion resistance testing
- Electrical tests such as insulation resistance and overvoltage
- Material compatibility tests for non-metallic and brass parts
These tests ensure conformity to safety and performance standards under varied operational conditions.
Practical Applications
-
Vehicle Manufacturers and Component Designers
ISO 20766-22:2025 guides the development and approval of LPG fuel system components, ensuring safety and reliability of power supply bushings interacting with fuel pumps, actuators, and sensors.
-
Quality Assurance and Compliance
Inspection bodies and certification agencies utilize this standard to verify marking legibility, construction integrity, electrical safety, and environmental robustness of LPG fuel system components.
-
Maintenance and Service Providers
Proper identification and adherence to the specified testing help in assessing component condition, ensuring safe replacements or repairs in LPG-powered vehicles.
-
Fuel System Integrators
The standard supports integration of LPG supply components in vehicles adapting to mono-fuel, bi-fuel, or dual-fuel LPG systems, facilitating compatibility with existing vehicle fuel infrastructures compliant with ISO 9162 and ISO 3833.
Related Standards
-
ISO 20766 Series
Other parts of the ISO 20766 series elaborate on LPG fuel system component requirements, test methods, and functional evaluations relevant to various fuel system parts beyond power supply bushings.
-
ISO 3833
Defines vehicle types and terminology essential for understanding the application scope of power supply bushings in LPG-fueled road vehicles.
-
ISO 9162
Specifies properties and classifications for gaseous fuels, particularly LPG, ensuring that power supply bushings are designed for compliant gas types and service pressures.
-
IEC 60529
Provides the classification for degrees of protection (IP codes) for electrical enclosures, referenced in the standard to define protection levels for power supply bushings installed in vehicle compartments.
ISO 20766-22:2025 plays a crucial role in standardizing power supply bushing components within LPG fuel systems, promoting safety, durability, and interoperability across the automotive industry’s use of gaseous fuels. Manufacturers, regulators, and service professionals benefit from its comprehensive approach to design, marking, and testing, ensuring LPG-powered vehicles operate reliably and securely in the global market.