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GB/T 23250-2009The direct method of determining coalbed gas content in the mine (English PDF)

煤层瓦斯含量井下直接测定方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 11, 2009

Implementation date

November 1, 2009

Scope

GB/T 23250-2009 is the English-translated version of 煤层瓦斯含量井下直接测定方法.

GB/T 23250-2009 fixes the direct method for determining coal seam gas content underground: the sampling method, the measurement of the desorbed gas, the compensation method for the lost gas, the measurement of the residual gas and the calculation of the coal seam gas content.

Clause 1 states that it applies to the direct determination of coal seam gas content in coal mines by the desorption method, and it rules out three cases built on seriously leaking drilling, gas drilling and core gas content, in wording the draft renders too brokenly to reproduce.

The table of contents runs 1 Scope, 2 Normative references, 3 Terms and definitions, 4 Equipment, 5 Sample, 6 measuring method and step, 7 Data Processing, 8 Determination Report and 9 measurement results of the evaluation, followed by nine informative annexes lettered A to I: a sampling record, two desorption record tables, one for coal measured underground and one for degassed coal samples, a laboratory desorption measurement record table, a summary table of coal seam gas content results, a gas analysis test report, a coal seam gas content measurement report, and two tables of saturation vapour pressure at different temperatures, one for water and one for saturated brine.

Clause 2 cites GB/T 212, GB 474, GB/T 3715, GB/T 13610, GB/T 15663.8, AQ 1026 and MT/T 752.

Clause 3 takes its terms from GB/T 15663.8 and adds six entries whose term names the draft does not print, among them the gas remaining in the coal after the sample has desorbed at normal pressure, the gas lost between the exposure of the coal and the start of measurement, the gas desorbed under negative pressure before the coal is pulverised, and the gas desorbed in a mill once more than 95 per cent of the coal is finer than 0.25 mm.

The draft stops at the end of those definitions, so the equipment, measurement, data processing and reporting clauses are shown by title only. It was proposed by the China Coal Industry Association and published by the General Administration of Quality Supervision, Inspection and Quarantine with the Standardization Administration.

The page names no superseded edition; the standard was issued on 2009-03-11 and has applied since 2009-11-01.

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Document preview — GB/T 23250-2009

National Standard of the People's Republic of China

ICS: 13.100
Classification: D 09

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

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 2 Equipment Sample 2
6 measuring method and step
7 Data Processing
8 Determination Report
9 measurement results of the evaluation
Appendix A (informative) Sampling record
Annex B (informative) coal underground natural gas desorption amount recorded measured
Annex C (informative) degassing coal sample record table
Annex D (informative) Laboratory of coal sample desorption natural gas volume measurement record table
Annex E (informative) coal seam gas content measurement results are summarized in Table
Annex F (informative) gas analysis test report
Annex G (informative) coal seam gas content measurement report
Appendix H (informative) saturation vapor pressure at different temperatures
Annex I (informative) at different temperatures saturated brine saturated vapor pressure of

Foreword

The Standard Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H and Appendix I are informative appendix.

The standard proposed by China Coal Industry Association.

The standard by the China Coal Industry Association.

1 Scope

This standard specifies the method of sampling of coal seam gas content directly measured downhole, the amount of desorbed gas measurement method, the amount of compensation for the loss of gas Party France, residual gas quantity measuring method and calculation method of coal seam gas content.

This standard applies to the determination of the direct use of coal mine gas content of coal desorption method.

This standard does not apply to serious leaking drilling, gas drilling and core discharge gas content.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB/T 212 industrial analysis of coal (GB/T 212-2008, ISO 11722:1999, NEQ)

GB 474 coal sample preparation method (GB 474-2008, ISO 18283:2006, MOD)

GB/T 3715 coal quality and coal analysis related terms (GB/T 3715-2007, ISO 1213-2:1992, NEQ)

GB/T 13610 natural gas composition analysis by gas chromatography

GB/T 15663.8 Coal Science and Technology Terminology - Part 8: Mine Safety

AQ1026 CMM basic indicators Methane adsorption

MT/T 752 Determination of coal (high pressure volumetric method)

3 Terms and definitions

GB/T 15663.8 well established in the following terms and definitions apply to this standard.

3.1

Under normal pressure, remaining in the coal after the coal sample desorption gas amount.

3.2

The amount of coal gas lost during the exposure to the desorption from the start of measurement.

3.3

Under negative pressure, pulverized coal before desorbed gas amount.

3.4

Under negative pressure, pulverized coal to gas volume more than 80% of the coal particle size is less than 0.25mm desorbed in a ball mill.

3.5

Under normal pressure, after underground coal sample desorption transported to the laboratory before crushing amount of desorbed gas.

3.6

Under normal pressure, pulverized coal to gas volume more than 95% coal particle size is less than 0.25mm desorbed in the mill.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 28 pages — is available in the English PDF.

Referenced standards

Normative references

GB 474 · AQ 1026

Cited by

Similar standards

GB 29742-2026|GB 30079-2026|GB 47290-2026|GB 47499-2026|GB/T 15081-2026|GB/T 16148-2026

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