GB/T 44410.1-2024Road vehicles - Compressed natural gas (CNG) fuel systems - Part 1: Safety requirements (English PDF)

Foreword

This document was drafted in accordance with the rules provided in GB/T 1.1-2020

Directives for standardization - Part 1: Rules for the structure and drafting of

standardizing documents.

This document is Part 1 of GB/T 44410 Road vehicles - Compressed natural gas (CNG)

fuel systems. The following parts have been issued for GB/T 44410:

-- Part 1: Safety requirements;

-- Part 2: Test methods.

This document adopts ISO 15501-1:2016, Road vehicles - Compressed natural gas

(CNG) fuel systems - Part 1: Safety requirements, by modification.

Compared with ISO 15501-1:2016, this document has a lot of adjustments in structure.

See Appendix A for a list of structure number changes between the two documents.

The technical differences between this document and ISO 15501-1:2016 and their

reasons are as follows:

-- Change the scope of the document (see Chapter 1; Chapter 1 of ISO 15501-

1:2016) to meet the requirements of our country's standard writing.

-- Add the normatively referenced GB/T 3730.2 (see Chapter 3), GB/T 20735-

2006 (see 4.1.2.3), GB/T 17676 (see Chapter 6) and GB/T 25978 (see Chapter

6) to adapt to our country's technical conditions;

-- Delete the terms 3.1, 3.4, 3.5, 3.6, 3.7 and 3.8 (see Chapter 3 of ISO 15501-

1:2016) to adapt to our country's technical conditions;

-- Use the normatively referenced GB/T 17258-2022 and GB/T 24160-2022 to

replace ISO 11439:2016 (see 4.1.1.1, 4.1.1.6, 4.1.2.2, 4.1.2.4, 4.4.1) to adapt

to our country's technical conditions, since there is no type-4-cylinder

specification in our country. The consistency between the two documents is

non-equivalent.

-- Use the normatively referenced GB/T 43408 to replace ISO 14469 (see 4.1.1.1,

4.1.2.1). After checking, ISO 14469 is of no sub-part documents, so "(all

parts)" is deleted to adapt to our country's technical conditions and increase

operability;

-- Change the requirements for automatic valves (see 4.1.1.6; 4.1.1 of ISO

15501-1:2016) to suit the product situation in our country;

Road vehicles - Compressed natural gas (CNG) fuel systems

- Part 1: Safety requirements

1 Scope

This document specifies the safety requirements for vehicles using CNG on-board fuel

systems.

This document is applicable to vehicles using single gas fuel, bi-fuel, and dual-fuel

compressed natural gas, and as a reference for the implementation of other vehicles.

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

version corresponding to that date is applicable to this document; for undated references,

the latest version (including all amendments) is applicable to this document.

GB/T 3730.2, Road vehicle - Masses - Vocabulary and codes

GB 3836.14-2014, Explosive atmospheres - Part 14: Classification of areas -

Explosive gas atmosphere (IEC 60079-10-1:2008, IDT)

GB/T 17258-2022, Steel cylinders for the on-board storage of compressed natural

gas as a fuel for automotive vehicles (ISO 11439:2013, NEQ)

GB/T 17676, Natural gas vehicle and liquefied petroleum gas vehicle -

Identification marks

GB/T 20735-2006, Pressure regulator of CNG vehicles

GB/T 24160-2022, Hoop-wrapped composite cylinders with steel liner for the on-

board storage of compressed natural gas as a fuel for automotive vehicles (ISO

11439:2013, NEQ)

GB/T 25978, Road vehicle - Plate and label

GB/T 43408, Road vehicles - Compressed natural gas (CNG) refuelling connector

(GB/T 43408-2023, ISO 14469:2017, MOD)

GB/T 44410.2-2024, Road vehicles - Compressed natural gas (CNG) fuel systems

- Part 2: Test methods (ISO 15501-2:2016, MOD)

When the valve has a gas-conducting channel, a sealing box or a gas discharge hose

shall seal the connection, pipeline, and gas discharge hole. If all leak sources (including

the cylinder-valve interface) are sealed and lead to the valve's internal gas-conducting

passages, it is not necessary to close off the valve body.