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 the essential provisions of this document through the normative references in the text. Among them, note the date of the reference document, only the date of the corresponding version applies to this document; do not note the date of the reference document, its latest version (including all the revision of the list) applies to this document.
GB/T 11060.1 Determination of sulphur compounds in natural gas Part 1: Determination of hydrogen sulphide content by the iodometric method
GB/T 11060.2 Determination of sulphur compounds in natural gas Part 2: Determination of hydrogen sulphide by the methylene blue method
GB/T11060.3 Determination of sulphur compounds in natural gas Part 3: Determination of sulphur content by lead acetate reaction rate dual optical path detection method
Hydrogen sulphide content
GB/T 11060.4 Determination of sulphur compounds in natural gas Part 4: Determination of total sulphur by oxidation microcoulometry
GB/T 11060.5 Determination of sulphur compounds in natural gas Part 5: Determination of total sulphur by hydrogenolysis - colorimetric method
GB/T 11060.8 Determination of sulphur compounds in natural gas Part 8: Determination of total sulphur content by ultraviolet fluorescence photometry
GB/T 11060.10 Determination of sulphur compounds in natural gas Part 10: Determination of sulphur compounds by gas chromatography
GB/T 11062 Calculation of calorific value, density, relative density and Wolper index of natural gas
GB/T 13610 Gas chromatography for the analysis of the composition of natural gas
GB/T 20368 Production, storage and shipment of liquefied natural gas (LNG)
GB/T 20603 Sampling of liquefied natural gas from frozen light hydrocarbon fluids Continuous method
GB/T 27894.1 ~ 27894.2 Determination of composition and calculation of associated uncertainties by gas chromatography of natural gas
GB/T 27894.3 ~ 27894.6 Determination of composition of natural gas by gas-phase colour harmonisation at a given uncertainty
3 Terminology and definitions
The following terms and definitions apply to this document.
3.1
Liquefied coalbed methane
Raw coalbed methane is dehydrated. It is converted into a liquid product by removing carbon dioxide (CO2), hydrogen sulphide (H2S) and nitrogen (N2 ) by dust removal and then by cooling (- 162 C) or other processes.
4 Quality requirements
The quality requirements for liquefied coalbed methane shall be in accordance with the provisions of Table 1.
5 Test methods
5.1 Methane content, nitrogen content determination according to GB/T 13610, GB/T 27894.1 ~ 27894.2 or GB/T 27894.3 ~ 27894.6 implementation, arbitration according to GB/T 13610 implementation.
5.2 Determination of high level heat generation according to GB/T 11062.
5.3 Determination of total sulphur content according to GB/T 11060.4, GB/T 11060.5 .GB/T 11060.8 or GB/T 11060.10, and in case of arbitration, according to GB/T 11060.4.
5.4 Determination of hydrogen sulfide content according to CPT 11060.1 .GB/T 11060.2, GB/T 11060.3 or GB/T 11060.10, arbitration according to the implementation of GB/T 11060.1.
6 Product inspection
6.1 Sampling
According to the implementation of GB/T 20603.
6.2 Inspection
6.2.1 Factory inspection
Test items are methane, nitrogen, hydrogen sulphide three.
6.2.2 Type test
Type test should be taken from the factory inspection of the production of qualified crystal, test items for all the items specified in this document.
One of the following circumstances, the type test should be carried out:
When first put into production;
normal production, every - year for - a type test;
Test results and the results of the last type test have a large difference;
Replace the main equipment or a new type of major equipment into the system when using;
A product out of production for more than six months to resume production.
6.3 Determination
Factory inspection when there is a failure, the batch of products is judged to be unqualified.
If a product fails in the type test, the product will be judged as unqualified.
7 Storage and shipment
The storage and shipment of liquefied coalbed methane shall be carried out in accordance with GB/T 20368.
Foreword
1 Scope
2 Normative references
3 Terminology and definitions
4 Quality requirements
5 Test methods
6 Product inspection
7 Storage and shipment
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 the essential provisions of this document through the normative references in the text. Among them, note the date of the reference document, only the date of the corresponding version applies to this document; do not note the date of the reference document, its latest version (including all the revision of the list) applies to this document.
GB/T 11060.1 Determination of sulphur compounds in natural gas Part 1: Determination of hydrogen sulphide content by the iodometric method
GB/T 11060.2 Determination of sulphur compounds in natural gas Part 2: Determination of hydrogen sulphide by the methylene blue method
GB/T11060.3 Determination of sulphur compounds in natural gas Part 3: Determination of sulphur content by lead acetate reaction rate dual optical path detection method
Hydrogen sulphide content
GB/T 11060.4 Determination of sulphur compounds in natural gas Part 4: Determination of total sulphur by oxidation microcoulometry
GB/T 11060.5 Determination of sulphur compounds in natural gas Part 5: Determination of total sulphur by hydrogenolysis - colorimetric method
GB/T 11060.8 Determination of sulphur compounds in natural gas Part 8: Determination of total sulphur content by ultraviolet fluorescence photometry
GB/T 11060.10 Determination of sulphur compounds in natural gas Part 10: Determination of sulphur compounds by gas chromatography
GB/T 11062 Calculation of calorific value, density, relative density and Wolper index of natural gas
GB/T 13610 Gas chromatography for the analysis of the composition of natural gas
GB/T 20368 Production, storage and shipment of liquefied natural gas (LNG)
GB/T 20603 Sampling of liquefied natural gas from frozen light hydrocarbon fluids Continuous method
GB/T 27894.1 ~ 27894.2 Determination of composition and calculation of associated uncertainties by gas chromatography of natural gas
GB/T 27894.3 ~ 27894.6 Determination of composition of natural gas by gas-phase colour harmonisation at a given uncertainty
3 Terminology and definitions
The following terms and definitions apply to this document.
3.1
Liquefied coalbed methane
Raw coalbed methane is dehydrated. It is converted into a liquid product by removing carbon dioxide (CO2), hydrogen sulphide (H2S) and nitrogen (N2 ) by dust removal and then by cooling (- 162 C) or other processes.
4 Quality requirements
The quality requirements for liquefied coalbed methane shall be in accordance with the provisions of Table 1.
5 Test methods
5.1 Methane content, nitrogen content determination according to GB/T 13610, GB/T 27894.1 ~ 27894.2 or GB/T 27894.3 ~ 27894.6 implementation, arbitration according to GB/T 13610 implementation.
5.2 Determination of high level heat generation according to GB/T 11062.
5.3 Determination of total sulphur content according to GB/T 11060.4, GB/T 11060.5 .GB/T 11060.8 or GB/T 11060.10, and in case of arbitration, according to GB/T 11060.4.
5.4 Determination of hydrogen sulfide content according to CPT 11060.1 .GB/T 11060.2, GB/T 11060.3 or GB/T 11060.10, arbitration according to the implementation of GB/T 11060.1.
6 Product inspection
6.1 Sampling
According to the implementation of GB/T 20603.
6.2 Inspection
6.2.1 Factory inspection
Test items are methane, nitrogen, hydrogen sulphide three.
6.2.2 Type test
Type test should be taken from the factory inspection of the production of qualified crystal, test items for all the items specified in this document.
One of the following circumstances, the type test should be carried out:
When first put into production;
normal production, every - year for - a type test;
Test results and the results of the last type test have a large difference;
Replace the main equipment or a new type of major equipment into the system when using;
A product out of production for more than six months to resume production.
6.3 Determination
Factory inspection when there is a failure, the batch of products is judged to be unqualified.
If a product fails in the type test, the product will be judged as unqualified.
7 Storage and shipment
The storage and shipment of liquefied coalbed methane shall be carried out in accordance with GB/T 20368.
Contents of GB/T 41031-2021
Foreword
1 Scope
2 Normative references
3 Terminology and definitions
4 Quality requirements
5 Test methods
6 Product inspection
7 Storage and shipment
