ISO 12991:2012

Name: ISO 12991:2012 — Liquefied natural gas (LNG) — Tanks for on-board storage as a fuel for automotive vehicles
SKU: ISO 12991:2012
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Liquefied natural gas (LNG) — Tanks for on-board storage as a fuel for automotive vehicles

Название (английский):

ISO 12991:2012

Liquefied natural gas (LNG) — Tanks for on-board storage as a fuel for automotive vehicles

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 16
Дата публикации:: 13 ноября 2012 г.
Издание:: ISO IS 12991 edition 1 version 1
ICS:: 23.020.40

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Описание (английский):

ISO 12991:2012 specifies the construction requirements for refillable fuel tanks for liquefied natural gas (LNG) used in vehicles as well as the testing methods required to ensure that a reasonable level of protection from loss of life and property resulting from fire and explosion is provided. It is applicable to fuel tanks intended to be permanently attached to land vehicles but can be used as a guide for other modes of transport.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 12991:2012 - "Liquefied natural gas (LNG) - Tanks for on‑board storage as a fuel for automotive vehicles" defines construction and testing requirements for refillable LNG fuel tanks permanently attached to land vehicles. The standard aims to ensure a reasonable level of protection against loss of life and property from fire, explosion and cryogenic hazards. It covers design, materials, insulation, manufacturing, type tests and routine inspection for on‑board cryogenic storage systems.

Key topics and technical requirements

Scope and application: Applicable to fuel tanks permanently mounted on land vehicles; can be used as guidance for other transport modes.

Terminology: Defines critical terms such as inner tank, outer jacket, MAWP (maximum allowable working pressure) and holding time (insulation performance metric).

Mechanical requirements:

Inner and outer pressure design and test levels (inner tank designed for pressures related to MAWP; outer jacket to resist 1 bar outer pressure).
Dynamic loads and crash/acceleration criteria by vehicle category (e.g., M1/N1: 20 g forward, 8 g lateral; M2/N2: 10 g forward, 5 g lateral; M3/N3: 6.6 g forward, 5 g lateral).

Thermal requirements:

Design temperature baseline 20 °C; ambient design range −40 °C to 85 °C (or 120 °C for engine compartments if applicable).
Components in contact with LNG must tolerate cryogenic temperatures (down to −196 °C).

Materials:

Compatibility with LNG and common vehicle fluids (coolant, brake fluid, battery acid).
Cryogenic toughness per ISO 21028‑1 for low‑temperature materials; outer jackets typically austenitic stainless steel to preserve insulation integrity.

Design and insulation:

Requirements for insulation performance measured by holding time, and design rules for fittings, supports and accessories (pressure relief valves, level gauges).

Testing and inspection:

Type tests: burst pressure, holding time, maximum fuelling level and accessory tests.
Routine tests: pressure, leak checks, dimensional verification, destructive/non‑destructive weld tests, visual inspection.

Marking and labelling: Mandatory markings for inner tank, outer jacket and temporary markings for first fuelling.

Applications and users

ISO 12991:2012 is essential for:

Vehicle OEMs (cars, buses, trucks) integrating LNG fuel tanks

Cryogenic tank designers and fabricators

Component suppliers (pressure‑relief devices, valves, sensors)

Testing laboratories, certification bodies and regulatory authorities

Fleet operators converting vehicles to LNG

Practical uses include tank design validation, supplier specifications, type approval, factory inspection protocols and safety case documentation.

Related standards (if applicable)

ISO 21028‑1 (toughness at cryogenic temperatures)

ISO 21014 (insulation performance)

ISO 21013‑3 (pressure‑relief accessory sizing)

ISO 23208 (cleanliness for cryogenic service)

ISO 12617 (fuelling system interface - under preparation)

Keywords: ISO 12991:2012, LNG tanks, on‑board storage, vehicle fuel tanks, cryogenic vessels, MAWP, holding time, pressure testing, insulation performance.

ISO 12991:2012

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards (if applicable)

Технические детали

BS EN ISO 21028-1:2016

Cryogenic vessels. Toughness requirements for materials at cryogenic temperature. Temperatures below -80 °C.

ISO 21014:2006

Cryogenic vessels — Cryogenic insulation performance

BS EN ISO 21013-3:2016

Cryogenic vessels. Pressure-relief accessories for cryogenic service. Sizing and capacity determination.

ISO 23208:2017

Cryogenic vessels — Cleanliness for cryogenic service

BS EN ISO 12617:2017

Road vehicles. Liquefied natural gas (LNG) refueling connector. 3,1 MPa connector.