ISO 12614-14:2021
(Main)Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 14: Differential pressure fuel content gauge
Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 14: Differential pressure fuel content gauge
This document specifies tests and requirements for the differential pressure fuel content gauge, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are to be considered gauge pressures unless otherwise specified. This document is based upon a maximum working pressure for natural gas as fuel of 1,6 MPa (16 bar1). Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 11 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
Véhicules routiers — Équipements pour véhicules utilisant le gaz naturel liquéfié (GNL) comme combustible — Partie 14: Jauge de carburant à manomètre différentiel
General Information
- Status
- Published
- Publication Date
- 03-Jun-2021
- Technical Committee
- ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
- Current Stage
- 6060 - International Standard published
- Start Date
- 04-Jun-2021
- Due Date
- 08-Jan-2022
- Completion Date
- 04-Jun-2021
Relations
- Effective Date
- 23-Apr-2020
Overview
ISO 12614-14:2021 specifies tests and performance requirements for the differential pressure fuel content gauge used in liquefied natural gas (LNG) fuel systems for road vehicles (as defined in ISO 3833). The standard focuses on the gauge as a component of LNG fuel systems and sets out marking, construction and test requirements to ensure safety, reliability and traceability in vehicle applications. It is one part of the ISO 12614 series covering LNG fuel system components.
Key topics and technical requirements
- Scope and applicability
- Applies to differential pressure fuel content gauges for motor vehicles; excludes fuel containers, stationary gas engines, mounting hardware, electronic fuel management and refuelling receptacles.
- All pressures are gauge pressures unless otherwise stated.
- Base working pressure: 1.6 MPa (16 bar); other system pressures are accommodated by applying proportional factors (e.g., 2.0 MPa × 1.25).
- Marking and traceability
- Required markings: manufacturer/agent identification, model designation, working pressure or pressure–temperature range, serial number or date code.
- Recommended markings include flow direction, fuel type, electrical ratings, certification symbol, approval number and reference to ISO 12614-14.
- Construction and assembly
- Pressure transducers and gauges must comply with ISO 12614-1 and ISO 12614-2 requirements.
- If the component is a gauge, it shall have a shatter-proof lens and a pressure relief means located at the rear of the body.
- Testing requirements
- Tests referenced from ISO 12614-2 are applicable; specific tests mandated here include:
- Hydrostatic strength: test pressure = 2.5 × working pressure.
- Leakage: performed at specified temperatures and pressure factors (see standard for table); tests include very low cryogenic temperatures (< −162 °C), ambient (20 °C) and elevated temperatures (85 °C or 120 °C) at defined pressure multipliers.
- Continued operation (durability): 20 000 cycles, where one cycle = pressurize to working pressure then depressurize to < 0.4 MPa (4 bar); followed by leakage test.
- Other applicable procedures include corrosion, vibration, excess torque, bending moment, electrical overvoltages and material compatibility tests as indicated in ISO 12614-2.
- Tests referenced from ISO 12614-2 are applicable; specific tests mandated here include:
Applications and users
- Intended users:
- Automotive OEMs and Tier‑1 suppliers designing or integrating LNG fuel systems.
- Component manufacturers and test laboratories validating gauge performance to ISO 12614-14:2021.
- Certification bodies and regulatory authorities assessing component compliance.
- Practical applications:
- Ensuring accurate fuel content monitoring in LNG-powered road vehicles.
- Verifying mechanical and leak-tight integrity under cryogenic, ambient and elevated conditions.
- Providing traceability and safety features for vehicle installation and type approval.
Related standards
- ISO 12614-1 - General requirements and definitions for LNG fuel system components
- ISO 12614-2 - Performance and general test methods referenced throughout ISO 12614-14
- ISO 3833 - Road vehicles - Types - Terms and definitions
Keywords: ISO 12614-14:2021, differential pressure fuel content gauge, LNG fuel system components, LNG gauge testing, hydrostatic strength, leakage test, continued operation, road vehicles.
Frequently Asked Questions
ISO 12614-14:2021 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 14: Differential pressure fuel content gauge". This standard covers: This document specifies tests and requirements for the differential pressure fuel content gauge, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are to be considered gauge pressures unless otherwise specified. This document is based upon a maximum working pressure for natural gas as fuel of 1,6 MPa (16 bar1). Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 11 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
This document specifies tests and requirements for the differential pressure fuel content gauge, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are to be considered gauge pressures unless otherwise specified. This document is based upon a maximum working pressure for natural gas as fuel of 1,6 MPa (16 bar1). Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 11 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
ISO 12614-14:2021 is classified under the following ICS (International Classification for Standards) categories: 43.060.40 - Fuel systems. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 12614-14:2021 has the following relationships with other standards: It is inter standard links to ISO 12614-14:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 12614-14:2021 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 12614-14
Second edition
2021-06
Road vehicles — Liquefied natural gas
(LNG) fuel system components —
Part 14:
Differential pressure fuel content
gauge
Véhicules routiers — Équipements pour véhicules utilisant le gaz
naturel liquéfié (GNL) comme combustible —
Partie 14: Jauge de carburant à manomètre différentiel
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . 2
5 Construction and assembly . 2
6 Test . 2
6.1 Applicability . 2
6.2 Hydrostatic strength . 3
6.3 Leakage . 3
6.4 Continued operation . 3
Bibliography . 4
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects of gaseous fuels.
This second edition cancel
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