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GB/T 41031-2021Liquefied coalbed methane (English PDF)

液化煤层气

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2021

Implementation date

July 1, 2022

Scope

GB/T 41031-2021 is the English-translated version of 液化煤层气.

GB/T 41031-2021 is the Chinese national product standard for liquefied coalbed methane, the liquid obtained when raw coalbed methane is dehydrated, cleaned of dust, carbon dioxide, hydrogen sulfide and nitrogen, and then cooled to about -162 °C or converted by other processes.

It sets the quality requirements for the product, the test methods, product inspection, storage and shipment.

The test methods rest on the GB/T 11060 series for sulfur compounds and hydrogen sulfide in natural gas, on gas chromatography for composition analysis, on GB/T 11062 for calorific value, density and Wobbe index, and on the LNG standards for sampling, production, storage and shipping.

Producers, shippers and buyers of liquefied coalbed methane use it to check product quality. It was issued on 31 December 2021 and has applied since 1 July 2022.

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Document preview — GB/T 41031-2021

National Standard of the People's Republic of China

ICS: 75.160
Classification: D 20

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and Definitions
4 Quality requirements

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1. Structure and Drafting Rules of Standardization Documents" drafted.

1 Scope

This document specifies the quality requirements, test methods, product inspection, storage and shipment of liquefied coalbed methane.

This document applies to liquefied coalbed methane.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 11060.1 Determination of sulfur compounds in natural gas - Part 1. Determination of hydrogen sulfide content by iodometry

GB/T 11060.2 Determination of sulfur compounds in natural gas - Part 2. Determination of hydrogen sulfide content by methylene blue method

GB/T 11060.3 Determination of Sulfur Compounds in Natural Gas-Part 3. Determination of Sulfur by Double Optical Path Detection of Lead Acetate Reaction Rate Hydrogen content

GB/T 11060.4 Determination of Sulfur Compounds in Natural Gas Part 4. Determination of Total Sulfur Content by Oxidative Microcoulometry

GB/T 11060.5 Determination of sulfur compounds in natural gas-Part 5. Determination of total sulfur content by hydrogenolysis-rate meter colorimetric method

GB/T 11060.8 Determination of Sulfur Compounds in Natural Gas Part 8. Determination of Total Sulfur Content by Ultraviolet Fluorescence Spectrophotometry

GB/T 11060.10 Determination of Sulfur Compounds in Natural Gas Part 10. Determination of Sulfur Compounds by Gas Chromatography

GB/T 11062 Calculation method of calorific value, density, relative density and Wobbe index of natural gas

GB/T 13610 Composition Analysis of Natural Gas - Gas Chromatography

GB/T 20368 Liquefied Natural Gas (LNG) Production, Storage and Shipping

GB/T 20603 Sampling continuous method of refrigerated light hydrocarbon fluid liquefied natural gas

GB/T 27894.1~27894.2 Determination of composition and calculation related uncertainty of natural gas by gas chromatography

GB/T 27894.3~27894.6 Determination of composition of natural gas by gas chromatography under certain uncertainty

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Liquefied coalbed methane

The raw coalbed methane is treated by dehydration, dust removal, removal of carbon dioxide (CO2), hydrogen sulfide (H2S) and nitrogen (N2), and then cooling (-162°C) or liquid products converted by other processes.

4 Quality requirements

The quality requirements for liquefied coalbed methane shall comply with the requirements in Table 1.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

Similar standards

GB 26569-2026|GB/T 26127-2025|GB/T 17664-2024|GB 26569-2011|GB/T 18856.1-2008|GB/T 18856.2-2008

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