GB/T 38753-2020 in English

《GB/T 38753-2020液化天然气》由TC355（全国石油天然气标准化技术委员会）归口，TC355SC1（全国石油天然气标准化技术委员会液化天然气分会）执行，主管部门为国家标准化管理委员会。

ChinaStandards.net is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.

This standard is developed in accordance with the rules given in GB/T 1.1-2009.

This standard was proposed by and is under the jurisdiction of National Technical Committee on Petroleum and Gas of Standardization Administration of China (SAC/TC 355).


Liquefied natural gas

1 Scope

This standard specifies the quality, test methods, inspection rules, storage and shipment requirements of liquefied natural gas.

This standard is applicable to commercial liquefied natural gas.

2 Normative references

The following referenced documents are indispensable for the application 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.

GB/T 11060.1 Natural gas - Determination of sulfur compound - Part 1: Determination of hydrogen sulfide content by iodometric titration method
GB/T 11060.3 Natural gas - Determination of sulfur compound - Part 3: Determination of hydrogen sulfide content by lead acetate reaction rate dual photo path method
GB/T 11060.4 Natural gas - Determination of sulfur compound - Part 4: Determination of total sulfur content by oxidative microcoulometry method
GB/T 11060.5 Natural gas - Determination of sulfur compound - Part 5: Determination of total sulfur content by hydrogenolysis and rateometric colorimetry method
GB/T 11060.8 Natural gas - Determination of sulfur compounds - Part 8: Determination of total sulfur content by ultraviolet fluorescence method
GB/T 11060.10 Natural gas - Determination of sulfur compounds - Part 10: Determination of sulfur compounds using gas chromatography method
GB/T 11062 Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition
GB/T 13610 Analysis of natural gas composition - Gas chromatography
GB/T 20368 Production, storage and handling of liquefied natural gas (LNG)
GB/T 20603 Refrigerated light hydrocarbon fluids - Sampling of liquefied natural gas - Continuous method
GB/T 27894
(All parts) Natural gas - Determination of composition with defined uncertainty by gas chromatography

3 Classification and quality requirements

3.1 The quality requirements of liquefied natural gas shall meet those specified in Table 1.

3.2 The liquefied natural gas is classified into three categories: lean liquid type, conventional liquid type and rich liquid type according to the methane content and high volumetric calorific value.

3.3 When either the methane content or the high volumetric calorific value of the liquefied natural gas is different from those specified in Table 1, the methane content is taken as the index for classification.

Table 1 Quality requirements of liquefied natural gas
Item Lean liquid type Conventional liquid type Rich liquid type
Molar fraction of methane/% >97.5 86.0~97.5 75.0~<86.0
Molar fraction of alkane/% ≤2
Molar fraction of carbon dioxide/% ≤0.01
Molar fraction of nitrogen/% ≤1
Molar fraction of oxygen/% ≤0.1
Total sulfur content (calculated by sulfur)a/(mg/m3) ≤20
Hydrogen sulfide contenta/(mg/m3) ≤3.5
High volumetric calorific value a /(MJ/m3) ≥37.0 and <38.0 ≥38.0 and ≤42.4 >42.4
a The measurement reference conditions used in this standard are 101.325kPa at 20℃, and the combustion reference conditions are 101.325kPa at 20℃.

4 Test methods and inspection rules

4.1 The sampling of liquefied natural gas shall be in accordance with GB/T 20603.

4.2 The determination of hydrocarbons, carbon dioxide, nitrogen and oxygen in liquefied natural gas shall be carried out according to GB/T 13610 or GB/T 27894 (all parts), and the arbitration test shall be subject to GB/T 13610.

4.3 The calculation of gross calorific value of liquefied natural gas shall be carried out according to GB/T 11062.

4.4 The determination of total sulfur content in liquefied natural gas shall be carried out according to GB/T 11060.4, GB/T 11060.5, GB/T 11060.8 or GB/T 11060.10, and the arbitration test shall be subject to GB/T 11060.8.

4.5 The determination of hydrogen sulfide content in liquefied natural gas shall be carried out according to GB/T 11060.1, GB/T 11060.3 or GB/T 11060.10, and the arbitration test shall be subject to GB/T 11060.1.

Foreword i
1 Scope
2 Normative references
3 Classification and quality requirements
4 Test methods and inspection rules
5 Storage and shipment
Bibliography