ISO 12614-5:2021 Road vehicles — Liquefied natural gas (LNG) fuel system components —Part 5: Tank pressure gauge

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Road vehicles — Liquefied natural gas (LNG) fuel system components —Part 5: Tank pressure gauge由ISO于2021‑06‑04发布，适用于全球范围。

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INTERNATIONAL STANDARD ISO 12614-5:2021

Road vehicles — Liquefied natural gas (LNG) fuel system components —

Part 5: Tank pressure gauge

1 Scope

This document specifies tests and requirements for the tank pressure 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.

1)

This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar ]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 126141‑ , Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 1: General requirements and definitions

ISO 12614‑2 , Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 2: Performance and general test methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 126141‑ and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

2

1) 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm .

ISO 12614-5:2021

— IEC Electropedia: available at https://www.electropedia.org/

3.1

tank pressure gauge

part of the system that is exposed to working pressure

4 Marking

Marking of the component shall provide sufficient information to allow the following to be traced:

a) the manufacturer’s or agent’s name, trademark, or symbol;

b) the model designation (part number);

c) the working pressure or pressure and temperature range;

d) the serial number or date code.

The following additional markings are recommended:

i) the direction of flow (when necessary for correct installation);

ii) the type of fuel;

iii) electrical ratings (if applicable);

iv) the symbol of the certification agency;

v) the type approval number;

vi) reference to this document (i.e. ISO 126145‑ ).

NOTE This information can be provided by a suitable identification code on at least one part of the component when it consists of more than one part.

5 Construction and assembly

5.1 The pressure indicator shall comply with the applicable provisions of ISO 12614‑1 and ISO 12614‑2 and with the tests specified in Clause 6.

5.2 The tank pressure gauge shall be capable of displaying at least 120 % of the working pressure.

5.3 If the tank pressure gauge is a gauge, it shall be equipped with a shatterpr‑ oof lens and possess a means of pressure relief located in the rear of its body.

Where a pressure gauge is located within the driver or passenger compartment or other insufficiently ventilated space, the pressure gauge shall be enclosed in a gas‑ tight housing in such a way that any gas leakage is vented and directed to the outside of the vehicle. When the pressure gauge is self‑ venting, the gas-tight housing shall enclose the connections, pipework, and venting orifices.

6 Test

6.1 Applicability

The tests required to be carried out are indicated in Table 1.

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