GB/T 44410.2-2024Road vehicles - Compressed natural gas (CNG) fuel systems - Part 2: Test methods (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 2 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 15501-2:2016, Road vehicles - Compressed natural gas

(CNG) fuel systems - Part 2: Test methods, by modification.

Compared with ISO 15501-2:2016, 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 15501-2:2016 and their

reasons are as follows:

-- Use the normatively referenced GB/T 44410.1-2024 to replace ISO 15501-1

(see Chapter 3, 4.3.2) to adapt to our country's technical conditions and

increase operability;

-- Delete the term "notified body" (see 3.1 of ISO 15501-2:2016) to adapt to our

country's technical conditions;

-- Change the strength test and acceptance conditions of gas cylinders (see

4.1.1.1, 4.1.1.3, 4.1.1.4) to adapt to our country's technical conditions;

-- Delete the requirements for aftermarket rotatable parts (see 4.1.2 and 4.1.3 of

ISO 15501-2:2016) to adapt to our country's technical conditions;

-- Add dynamic test acceleration and equivalent calculation method for gas

cylinders of different types of vehicles (see 4.1.2.3, 4.1.2.4) to adapt to our

country's technical conditions;

-- Add gas density state in static test (see 4.1.3.2), with different gas density

values at different temperatures;

-- Use the normatively referenced GB/T 17258 to replace ISO 11439 (see 4.1.5.3)

to adapt to our country's technical conditions and increase operability.

This document also makes the following editorial modifications:

-- Add the informatively referenced GB/T 3730.1 (see Chapter 1);

Road vehicles - Compressed natural gas (CNG) fuel systems

- Part 2: Test methods

1 Scope

This document describes the test methods for compressed natural gas on-board fuel

systems that meet the safety requirements of GB/T 44410.1-2024.

This document applies to road vehicles using compressed natural gas on-board fuel

systems as specified in GB/T 3730.1.

Note: For the tests of individual components, refer to ISO 15500 (all parts), GB/T

43408, GB/T 17258 and GB/T 24160.

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 17258, Steel cylinders for the on-board storage of compressed natural gas as

a fuel for automotive vehicles (GB/T 17258-2022, ISO 11439:2013, NEQ)

GB/T 44410.1-2024, Road vehicles - Compressed natural gas (CNG) fuel systems

- Part 1: Safety requirements (ISO 15501-1:2016, MOD)

ISO 6487, Road vehicles - Measurement techniques in impact tests -

Instrumentation

ISO 15500-1, Road vehicles - Compressed natural gas (CNG) fuel system

components - Part 1: General requirements and definitions

3 Terms and definitions

For the purposes of this document, the following terms and definitions, as well as those

given in GB/T 44410.1-2024 and ISO 15500-1, apply.

4 Test methods