GB 18047-2026Compressed natural gas as vehicle fuel (English PDF)

Foreword

Article 4.1 of this Standard is mandatory. The rest are recommendatory.

This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB 18047-2000 “Compressed natural gas as vehicle fuel”. As compared with GB 18047-2000, the main changes of this Standard are as follows.

- REVISE technical specifications for total sulfur. It is changed from “not more than 200 mg/m3” to “not more than 100 mg/m3” (SEE Table 1);

- REVISE technical specifications for water dew point. The minimum requirement that “under the maximum operating pressure, the water dew point shall be not higher than -13 °C” is changed to “the mass concentration of water shall not be more than 30 mg/m3”, which is recommended in ISO 15403-2 2006;

- ADD test methods for various indicators and POINT out arbitration methods at the same time;

- MODIFY the gas categories in Appendix B; MODIFY the indicators for 10T and 12T gas; CANCEL 13T gas.

This Standard shall be under the jurisdiction of China National Gas Standardization Technology Committee (SAC/TC 244).

Drafting organizations of this Standard. PetroChina Southwest Oil & Gasfield Branch Natural Gas Research Institute, North China Municipal Engineering Design & Research Institute Co., Ltd., China Petroleum Engineering & Construction Corp East China Design Branch, China National Offshore Oil Corporation Research Institute.

Main drafters of this Standard. Tang Meng, Wu Hongsong, Chi Yongjie, Zhang Yanxia, He Bin, He Yongming, Cui Dechun, Li Shengshan.

The previous release of version of the standard replaced by this Standard is. - GB 18047-2000.

Compressed natural gas as vehicle fuel

1 Scope

This Standard specifies the technical requirements and test methods of compressed natural gas as vehicle fuel.

This Standard applies to the compressed natural gas of which the pressure is not more than 25 MPa as vehicle fuel.

2 Normative references

GB/T 11060.1

GB/T 11060.2

GB/T 11060.3

GB/T 11060.4

GB/T 11060.5

GB/T 11060.7

GB/T 11060.8

3 Terms and definitions

The following terms and definitions are applicable to this document.

4 Technical requirements and test methods

5 Storage and use

6 Inspection

6.1 The sampling of compressed natural gas as vehicle fuel shall be carried out according to GB/T 13609.

Appendix A Appendix A

(Informative) Calculation method of methane number A.1 Definition of methane number MN Methane Number An agreed value which represents the antiknock quality of fuel of spark ignition engine.

A.2 Octane number and methane number A.2.1 Correlation between octane number and methane number The U.S. Gas Technology Institute (GRI) [should be. GTI] used ASTM’s evaluation method of octane number to measure the motor octane number (MON) of gas fuel. The measurement results show that, the MON of pure methane is about 140; the MON of most natural gas is 115~130.The MON of peak-shaving gas with high propane content (17%~25%) is 96~97.The GRI [should be. GTI], through its research, has derived two correlations between composition or hydrogen-carbon ratio and octane number, which are in good agreement with the experimental data, and can be applied to most conventional natural gas. In addition, there are two correlations between octane number and methane number derived from experimental data. These correlations are as follows. ......