BS ISO 12614-20-2023 PDF

Full title and description

STB BS ISO 12614-20-2023 — Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 20: Flexible fuel or vent lines. This document specifies performance, testing and construction requirements for flexible fuel and vent lines used in LNG vehicle fuel systems so that these components meet safety and functional requirements for road vehicles.

Abstract

This part of ISO 12614 defines tests and requirements for flexible fuel lines intended for use in LNG-fuelled road vehicles (vehicle types as defined in ISO 3833). It establishes functional test methods, pressure provisions (based on a working pressure of 1,6 MPa / 16 bar as a reference), and exclusions (for example it does not apply to fuel containers, stationary gas engines, container mounting hardware, electronic fuel management or refuelling receptacles).

Primary international publication: ISO 12614-20:2023 (Edition 1, August 2023).

General information

• Status: Published.
• Publication date: ISO edition published 28 August 2023; British-adopted BS ISO edition published 30 August 2023.
• Publisher: International Standard published by ISO; British adoption published by BSI as BS ISO 12614-20:2023.
• ICS / categories: 43.060.40 (Fuel systems for road vehicles).
• Edition / version: Edition 1 (2023).
• Number of pages: ISO PDF: 9 pages; BS-adopted publication appears as 16 pages in the BSI-formatted version.

Scope

This part of ISO 12614 specifies tests and requirements for flexible fuel lines (and associated vent lines) forming components of liquefied natural gas (LNG) fuel systems on road vehicles. It applies to components intended for vehicle types defined in ISO 3833 and sets out functional testing, pressure test levels (reference working pressure 1,6 MPa / 16 bar) and acceptance criteria. The standard explicitly excludes fuel containers, stationary gas engines, container mounting hardware, electronic fuel management and refuelling receptacles from its scope.

Key topics and requirements

• Definition of flexible fuel and vent lines used in LNG vehicle fuel systems and reference to vehicle type definitions (ISO 3833).
• Functional and mechanical testing requirements for flexible lines (pressure tests, leak testing and functional integrity under expected service conditions).
• Reference working pressure basis of 1,6 MPa (16 bar) and guidance on scaling pressures for other working-pressure systems.
• Material, assembly and construction considerations to ensure compatibility with LNG and cryogenic temperature environments.
• Normative and normative-reference linkage to other parts of ISO 12614 (for example Part 1 general requirements and Part 11 for fittings) and to relevant industry piping codes where applicable.

Typical use and users

Manufacturers of LNG fuel-system components (flexible hoses and vent lines), vehicle original equipment manufacturers (OEMs) integrating LNG systems, component testing and certification laboratories, suppliers of fittings and assemblies for cryogenic fuel systems, and regulatory or procurement bodies specifying LNG vehicle component performance requirements. Users consult this standard when designing, qualifying, validating and procuring flexible fuel/vent lines for LNG-powered road vehicles.

Related standards

Key related documents include ISO 12614-1 (General requirements and definitions for LNG fuel system components), ISO 12614-11 (Fittings), and vehicle-definition standards such as ISO 3833; other industry piping and material standards (for example ANSI/ASME B31.3) may be referenced for complementary requirements.

Keywords

LNG, liquefied natural gas, road vehicles, fuel system components, flexible fuel lines, vent lines, ISO 12614, cryogenic fuel lines, pressure testing, vehicle fuel systems.

FAQ

Q: What is this standard?

A: ISO 12614-20:2023 (published and also available as BS ISO 12614-20:2023) is the part of the ISO 12614 series that specifies tests and requirements for flexible fuel and vent lines used in LNG-fuelled road vehicles.

Q: What does it cover?

A: It covers functional and pressure testing, construction and performance requirements for flexible fuel and vent lines intended for LNG vehicle fuel systems, with a reference working pressure of 1,6 MPa (16 bar). It also lists specific exclusions such as fuel containers and refuelling receptacles.

Q: Who typically uses it?

A: Component manufacturers, OEMs, test laboratories, supply-chain engineers and procurement or regulatory authorities involved with LNG vehicle fuel systems.

Q: Is it current or superseded?

A: As published, ISO 12614-20:2023 is current (Edition 1, published August 2023). No superseding edition was indicated at the time of publication. Users should check national adoption notices (for example the BSI adoption) or the ISO catalogue for any later revisions.

Q: Is it part of a series?

A: Yes — ISO 12614 is a multi-part series covering LNG fuel system components; Part 20 is one part focused on flexible fuel or vent lines and is linked to other parts such as Part 1 (general requirements) and Part 11 (fittings).

Q: What are the key keywords?

A: LNG, flexible fuel line, vent line, road vehicles, LNG fuel system, cryogenic fuel components, ISO 12614, pressure testing.