ISO 15500-10:2015

Overview

ISO 15500-10:2015 is an international standard that specifies the requirements and test methods for the gas-flow adjuster used in compressed natural gas (CNG) fuel systems of road vehicles. This component plays a critical role in regulating the flow of natural gas fuel within motor vehicles, as defined under ISO 3833. The standard applies to vehicles using natural gas according to ISO 15403-1, covering mono-fuel, bi-fuel, and dual-fuel applications. It excludes certain components such as liquefied natural gas (LNG) systems upstream of the vaporizer, fuel containers, stationary engines, and refueling receptacles.

This document is part 10 of the broader ISO 15500 series dedicated to various CNG fuel system components, aiming to ensure safety, reliability, and interoperability across natural gas-powered vehicles globally.

Key Topics

• Scope and applicability: Establishes the functional and operational domain of the gas-flow adjuster, emphasizing its use in motor vehicles fueled by compressed natural gas.
• Marking requirements: Components must be clearly marked with manufacturer details, model number, working pressure, temperature range, and flow direction to assure traceability and proper installation.
• Construction and assembly: Sets guidelines ensuring the gas-flow adjuster complies with the general standards of ISO 15500-1 and ISO 15500-2, including dimensional tolerances and design criteria.
• Testing procedures: Defines rigorous tests including:
  • Hydrostatic strength to verify pressure resistance (tested at 4 times the working pressure or a minimum of 0.6 MPa).
  • Leakage tests at extreme temperatures (-40 °C to 120 °C) to ensure tightness under working conditions.
  • Continued operation testing for devices subject to frequent adjustments, simulating 100,000 cycles to assess durability.
  • Electrical tests where applicable, such as insulation resistance and minimum operating voltage to evaluate electrical safety and functionality.
• Pressure considerations: All pressures referenced are gauge pressures. The standard is based on a 20 MPa (200 bar) service pressure at 15 °C, with adjustment factors provided for higher pressures.

Applications

ISO 15500-10:2015 facilitates the design, manufacture, and quality assurance of gas-flow adjusters integral to the CNG fuel delivery systems in:

• Passenger vehicles and commercial trucks running on natural gas.
• Mono-fuel and dual-fuel systems where vehicles use only natural gas or a mix with traditional fuels.
• Ensuring component compatibility and safety during normal operation and servicing in natural gas vehicles.
• Supporting the expansion of environmentally friendly fuel options by providing a standardized framework for critical CNG components.
• Assisting manufacturers in meeting regulatory and safety requirements for natural gas vehicles globally.

Related Standards

ISO 15500-10:2015 works in conjunction with other parts of the ISO 15500 series that cover comprehensive aspects of CNG systems:

• ISO 15500-1: General requirements and definitions for CNG fuel system components.
• ISO 15500-2: Performance and general test methods applicable to all CNG components.
• Additional parts detailing valves (manual, automatic), injectors, pressure regulators, safety devices, and fuel lines.

It also aligns with complementary standards including:

• ISO 3833: Definitions of vehicle types applicable to the gas-flow adjuster.
• ISO 15403-1 and ISO/TR 15403-2: Quality specifications for natural gas used as a vehicle fuel.

By adhering to ISO 15500-10:2015, manufacturers and stakeholders ensure that gas-flow adjusters in CNG vehicles meet standardized performance and safety benchmarks, supporting the wider adoption and safe operation of compressed natural gas as a clean alternative automotive fuel.