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GB/T 42638-2023 English PDF

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US$339.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 42638-2023: The direct measuring method of the coal seam gas drainage radius in coal mine - Method of drainage volume
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 42638-2023	339	Add to Cart	4 days	The direct measuring method of the coal seam gas drainage radius in coal mine - Method of drainage volume	Valid

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Basic data

Standard ID: GB/T 42638-2023 (GB/T42638-2023)
Description (Translated English): The direct measuring method of the coal seam gas drainage radius in coal mine - Method of drainage volume
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D09
Classification of International Standard: 13.100
Word Count Estimation: 16,162
Date of Issue: 2023-05-23
Date of Implementation: 2023-12-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42638-2023: The direct measuring method of the coal seam gas drainage radius in coal mine - Method of drainage volume

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 13:100 CCSD09 National Standards of People's Republic of China Method for direct measurement of coal seam gas drainage radius in coal mine extraction volume method Released on 2023-05-23 2023-12-01 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

Preface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Instruments and equipment 2 5 Determination process 2 6 Determination of the results confirmed 5 Appendix A (Informative) Drilling Construction Parameter Record Table 8 Appendix B (Informative) Drainage Parameters Observation Record Table 9 Appendix C (Informative) Method for Determination of Up-to-standard Gas Content 10 Reference 12

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 for Standardization Documents" drafting: Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed and managed by China Coal Industry Association: This document was drafted by: Coal Science and Technology Research Institute Co:, Ltd:, Jinneng Holdings Shanxi Science and Technology Research Institute Co:, Ltd:, China Coal Science and Technology Research Institute Co:, Ltd: Industrial Group Chongqing Research Institute Co:, Ltd:, China University of Mining and Technology, China Coal Science and Industry Group Shenyang Research Institute Co:, Ltd: The main drafters of this document: Huo Zhonggang, Shu Longyong, Wang Dezhang, Cheng Yuanping, He Guanghui, Zhao Xusheng, Li Yang, Du Hailong, Zhang Lang, Wang Weihua, Wang Liang, Cao Yaolin, Chang Weibin, Lu Guichun, Zhang Huijie, Hao Jinwei, Fan Yongpeng, Fan Xisheng, Zhu Nannan, Zhao Xueliang, Cui Cong, Song Xin, Zhao Can, Wang Gongda, Liu Yongqian, Sun Xiaojun: Method for direct measurement of coal seam gas drainage radius in coal mine extraction volume method

1 Scope

This document describes the equipment, measurement process and confirmation of measurement results of the direct measurement method of coal seam gas drainage radius in coal mines: This document is applicable to the determination of the drainage radius of bedding boreholes, bedding boreholes and bedding directional long boreholes in underground coal mines:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document: GB/T 1227 precision pressure gauge GB/T 15663:8 Coal Mine Technical Terminology Part 8: Coal Mine Safety GB/T 23250 Coal seam gas content underground direct measurement method MT/T 28 Optical interferometric methane detector

3 Terms and Definitions

The following terms and definitions defined in GB/T 15663:8 apply to this document: 3:1 Under certain extraction conditions (drainage hole diameter, extraction negative pressure, hole sealing process, etc:) and extraction time, with the extraction drilling as the center, the The radius of the circular area where the coal seam gas drainage effect reaches the standard: 3:2 Determination of borehole measurementdriling Drainage boreholes constructed in accordance with the design parameters in the investigation section and used to monitor the drainage effect (flow rate, concentration, negative pressure and other parameters): 3:3 In order to make the measured boreholes in the investigation section be in a limited flow field environment, the parameters of the construction around the measured boreholes are the same as those of the measured boreholes: extraction boreholes: 3:4 The amount of gas contained in a unit mass or unit volume of coal body when the coal seam gas drainage effect reaches the standard: 3:5 When the coal seam gas drainage effect reaches the standard, the amount of gas contained in the coal seam except the non-desorbable gas under normal pressure: ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 42638-2023_English be delivered?

Answer: Upon your order, we will start to translate GB/T 42638-2023_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 42638-2023_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 42638-2023_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.