HOME   Cart(0)   Quotation   About-Us Policy PDFs Standard-List
www.ChineseStandard.net Database: 189760 (18 Oct 2025)

GB/T 20936.2-2024 English PDF

US$1659.00 · In stock
Delivery: <= 9 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 20936.2-2024: Gas detectors for explosive atmospheres - Part 2: Selection, installation, use and maintenance of detectors for flammable gases and oxygen
Status: Valid

GB/T 20936.2: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 20936.2-2024English1659 Add to Cart 9 days [Need to translate] Gas detectors for explosive atmospheres - Part 2: Selection, installation, use and maintenance of detectors for flammable gases and oxygen Valid GB/T 20936.2-2024
GB/T 20936.2-2017EnglishRFQ ASK 8 days [Need to translate] Gas detectors for explosive atmospheres -- Part 2: Selection, installation, use and maintenance of detectors for flammable gases and oxygen Obsolete GB/T 20936.2-2017
GB 20936.2-2009English319 Add to Cart 3 days [Need to translate] Electrical apparatus for the detection and measurement of flammable gases -- Part 2: Performance requirements for group I apparatus indicating a volume fraction up to 5% methane in air Obsolete GB 20936.2-2009

PDF similar to GB/T 20936.2-2024


Standard similar to GB/T 20936.2-2024

GB/T 25285.1   GB/T 20936.4   GB/T 29304   GB/T 19518.1   GB/T 22769   GB/T 20936.1   

Basic data

Standard ID GB/T 20936.2-2024 (GB/T20936.2-2024)
Description (Translated English) Gas detectors for explosive atmospheres - Part 2: Selection, installation, use and maintenance of detectors for flammable gases and oxygen
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K35
Classification of International Standard 29.260.20
Word Count Estimation 82,842
Date of Issue 2024-03-15
Date of Implementation 2024-10-01
Older Standard (superseded by this standard) GB/T 20936.2-2017
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration

GB/T 20936.2-2024: Gas detectors for explosive atmospheres - Part 2: Selection, installation, use and maintenance of detectors for flammable gases and oxygen


---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 29.260.20 CCSK35 National Standards of People's Republic of China Replaces GB/T 20936.2-2017 Gas detectors for explosive atmospheres Part 2.Combustible gas and oxygen detectors Selection, installation, use and maintenance Published on March 15, 2024, implemented on October 1, 2024 State Administration for Market Regulation The National Standardization Administration issued

Table of Contents

Preface III Introduction V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Basic information on gas and vapor properties and characteristics and specific applications of gas detection 10 4.1 Detection of gases or vapors 10 4.2 Some common properties of gases and vapors 11 4.3 Differences between detection gas and detection vapor 12 4.4 Oxygen deficiency 15 4.5 Specific applications of gas detection 17 4.6 Specific considerations for open path detection 19 5 Measurement Principle 21 6 Equipment selection 21 6.1 General Principles 21 6.2 Selection criteria 21 6.3 Various factors affecting equipment selection 26 7 Gas release method 26 7.1 Natural Release26 7.2 Buildings and walls 28 7.3 Environmental factors 29 8 Design and installation of fixed gas detection systems 30 8.1 General 30 8.2 Basic installation elements of fixed detection system 30 8.3 Detection point location 31 8.4 Calibration and maintenance 34 8.5 Additional considerations for sampling tubes 34 8.6 Additional considerations for open path detectors 35 8.7 Notes on measuring points and open path locations 35 8.8 Installation of measuring point or open path detectors 36 8.9 Integrity and safety of fixed systems 36 8.10 Installation and construction work time 37 8.11 Trial Operation 37 8.12 Operating instructions, plans and records 38 9 Use of portable and mobile combustible gas detectors 38 9.1 General Principles 38 9.2 Initial and periodic inspection procedures for portable and mobile instruments 39 9.3 Guidelines for the use of portable and mobile detectors 41 10 Training of operators 43 10.1 General 43 10.2 General Training - Basic Restrictions and Safety 43 10.3 Operator Training 44 10.4 Maintenance training 44 11 Maintenance, routine procedures and general management control 44 11.1 General Principles 44 11.2 Operational Check 45 11.3 Maintenance 47 11.4 Sensors 48 11.5 Sampling system 48 11.6 Display Device 49 11.7 Alarm 49 11.8 Calibration 49 Appendix A (Normative) Measurement Principle 52 Appendix B (Informative) Environmental Parameters 67 Appendix C (Informative) Typical Environment and Application Checklist for Combustible Gas Detectors (Applicable to both Class I and Class II Equipment) 68 Appendix D (Informative) Atmospheric Visibility (Applicable to Open Path Detectors) 70 Appendix E (Informative) Typical maintenance record of combustible gas detectors 71 References 72

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. This document is part 2 of GB/T 20936 "Gas detectors for explosive atmospheres". GB/T 20936 has been published for the following part. --- Part 1.Performance requirements for combustible gas detectors; --- Part 2.Selection, installation, use and maintenance of combustible gas and oxygen detectors; --- Part 3.Guidelines for functional safety of fixed gas detection systems; --- Part 4.Performance requirements for open path combustible gas detectors. This document replaces GB/T 20936.2-2017 "Gas detectors for explosive atmospheres Part 2.Combustible gas and oxygen detectors Compared with GB/T 20936.2-2017, in addition to structural adjustments and editorial changes, the main technical changes are as follows. --- The scope adds Class I equipment (see Chapter 1); --- Added the content of open path detector (see Chapter 3, 4.6, 6.2.3.5, 8.2, 8.6, 8.7, 8.8, Chapter 11, A.4); --- Added specific application of gas detectors (see 4.5); --- Added the content of sampling system (see 6.2.3.4, 8.2.3, 8.5, 11.2.2). This document is modified to adopt IEC 60079-29-2.2015 "Explosive atmospheres Part 29-2.Gas detectors for flammable gases and oxygen "Detector selection, installation, use and maintenance". This document has made the following structural adjustments compared to IEC 60079-29-2.2015. --- Appendix D corresponds to Appendix E of IEC 60079-29-2.2015; --- Appendix E corresponds to Appendix D of IEC 60079-29-2.2015. The technical differences between this document and IEC 60079-29-2.2015 and their reasons are as follows. --- The normative reference GB/T 3836.1 replaces IEC 60079-0 (see Chapter 3, 6.2.2, 8.11.1) to adapt to the technical requirements of my country. Technical conditions and increase operability; --- Replaced IEC 60079-19 (see 11.1) with the normative reference GB/T 3836.13 to adapt to my country's technical conditions and increase Operability; --- Replaced IEC 60079-10-1.2008 (see 6.3.2) with the normative reference GB 3836.14 to adapt to my country's technical conditions, Increase operability; --- Replaced IEC 60079-17 (see 11.1) with the normative reference GB/T 3836.16 to adapt to my country's technical conditions and increase Operability; --- Replaced IEC 60079-13 (see 4.5.3) with the normative reference GB/T 3836.17 to adapt to my country's technical conditions and increase Operability; --- The normative reference GB/T 3836.35 replaces IEC 60079-10-2 (see 6.3.2) to adapt to my country's technical conditions and increase Increase operability; --- The normative reference GB/T 29812 replaces IEC 61285 (see 4.5.3) to adapt to my country's technical conditions and increase operability. Sex; --- Deleted the specific content on measurement principles in Chapter 5 because it has been included in Appendix A. The following editorial changes were made to this document. --- To be consistent with the existing standard series, the document name is changed to "Gas detectors for explosive atmospheres Part 2.Combustible gases and Selection, installation, use and maintenance of oxygen detectors"; --- Added information about the addresses of ISO and IEC terminology databases in the terms and definitions; --- GB/T 20936.1 and GB/T 20936.4 replaced the informative references IEC 60079-29-1.2007 and IEC 60079-29-4.2009; --- Deleted the information about relevant documents in the United States and Europe in Note 4.1.2; --- Deleted the note on training in 10.1; --- Changed the environmental parameter values in Table B.1; ---Replace the international documents cited for informational purposes with Chinese documents. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Technical Committee for Standardization of Explosion-proof Electrical Equipment (SAC/TC9). This document was drafted by. Nanyang Explosion-proof Electrical Research Institute Co., Ltd., Henan Institute of Metrology, Shenzhen Te'an Electronics Co., Ltd. Co., Ltd., Hanwei Technology Group Co., Ltd., China Coal Technology and Engineering Group Changzhou Research Institute Co., Ltd., Shanghai Instrument and Automation System Inspection and Testing Co., Ltd. Co., Ltd., Nanyang Product Quality Inspection and Testing Center, Chongqing Chuanyi Analytical Instrument Co., Ltd., Shenzhen Wanxun Automation Co., Ltd., Shanghai Baolin Explosion-proof Electrical Appliance Co., Ltd., Henan Scientific Research Platform Service Center. The main drafters of this document are. Wang Jun, Li Shuxiang, Wang Junfeng, Zhong Liyun, Li Hangchuan, Lü Xiaodong, Liu Jie, Zhang Lixiao, Huang Yunbiao, Zhang Gang, Chen, Z.W., Weng, Z.K., and Ren, W. The previous versions of this document and the documents it replaces are as follows. ---First published in.2017 as GB/T 20936.2-2017; ---This is the first revision.

Introduction

GB/T 20936 "Gas detectors for explosive atmospheres" aims to establish the basic requirements for the performance of various types of flammable gas detectors and provide Provides application guidance in the form of a partial standard, including the following parts. --- Part 1.Performance requirements for combustible gas detectors; --- Part 2.Selection, installation, use and maintenance of combustible gas and oxygen detectors; --- Part 3.Guidelines for functional safety of fixed gas detection systems; --- Part 4.Performance requirements for open path combustible gas detectors. my country adopted the IEC 61779 series from.2007 to.2009 and formulated the GB 20936 "Electrical Equipment for Combustible Gas Detection" series. It is divided into four parts, which respectively stipulate the general requirements and test methods as well as the performance requirements of Class I and Class II detectors with different measurement ranges. Subsequently, the IEC 60079-29 series was adopted for revision, forming the new GB/T 20936 "Gas detectors for explosive atmospheres" series. The GB/T 20936.1 is mainly based on the original Part 1 and integrates the original Parts 2 to 4, while GB/T 20936.2, GB/T 20936.3 and GB/T 20936.4 are newly formulated parts (only the original standard codes are used). This revision adopts IEC 60079-29-2.2015 "Explosive atmospheres Part 29-2.Gas detectors for flammable gases and oxygen Based on the main technical contents of "Detector selection, installation, use and maintenance", appropriate modifications have been made. The following should be understood when using this document. Combustible gas detectors can be used when the mixture of flammable gas and air accumulates and may cause harm to life or property. Detectors reduce risk by detecting the presence of flammable gases and issuing appropriate audible and visual alarms. Gas detectors can also be used to initiate preventive Actions (e.g., equipment shutdown, personnel evacuation, and initiation of fire-fighting procedures). The detector can also be used to monitor the atmosphere for gases below the lower flammable limit, where accumulation of gases can also cause the gas/air mixture to The concentration reaches a potential explosion level. The performance requirements of gas detectors used for this purpose are specified in GB/T 20936.1 and GB/T 20936.4. For the functional safety guide of fixed gas detection systems, see GB/T 20936.3. However, where flammable gases may be present, detector performance alone cannot ensure the safety of life and property. The design, installation, calibration and regular maintenance of the detector, as well as an understanding of the limitations of the detection technology, have a significant impact on the level of safety that needs to be achieved. Only through comprehensive and reliable management can the goal of safety be achieved. The vapors of some gases and of all liquids (except water) are toxic and dangerous to life. All flammable vapors, even in concentrated Even a small fraction of the lower flammable limit may be toxic. The detectors involved in GB/T 20936.1 and GB/T 20936.4 are not special Anti-toxic equipment. If personnel may be exposed to toxic vapors, additional personal protective measures are usually required. Portable detectors covered by GB/T 20936.1 and GB/T 20936.2 are usually equipped with specific toxic gas and oxygen-deficient gas detectors. Users should be aware that some other gases or vapors with toxic components may cause a slight oxygen deficiency that may not be detected by the detector used, or The situation cannot be adequately detected. GB/T 20936.1 and GB/T 20936.4 specify the general requirements for specific combustible gas detectors. Provides the necessary background knowledge. This document covers all the functions required for gas detection from selection to ongoing maintenance. The requirements of different chapters are applicable to different Each chapter is as independent as possible. Although some chapters have repeated contents, they focus on different points. Table 1 gives the relevant clauses and requirements for performing typical tasks. Table 1 Requirements for performing typical tasks Definition of applicable objects Gas and Steam base This feature information Measurement principle equipment Selection Gas Release Placement method Fixed Gas Detector Measurement system the design of and installation Portable and mobile Flammable Gas Detector Detector use Operation Personnel Training maintain, Regular itinerary Preface, Summary Body Management control Measurement principle Principle (full Details) (Normative) environment parameter (Informative) Function (Chapter) 3 4 5 6 7 8 9 10 11 Appendix A Appendix B Authorization - - - - - General Management - - - Selection - Design Engineering/Management - - - Installation Engineering/Management - - - Installation, technology - - - Trial run - - - Operation Management Operation training Use/Calibration - - - Repair - - - Note. “ ” indicates the most suitable; “ ” indicates recommended; “ ” indicates useful; “-” indicates not applicable. This document provides recommendations on how to determine maintenance and calibration intervals. If there are general or industry-specific mandatory regulations, these regulations should be used as is the minimum requirement. Gas detectors for explosive atmospheres Part 2.Combustible gas and oxygen detectors Selection, installation, use and maintenance

1 Scope

This document provides Class II flammable gases that meet the requirements of GB/T 20936.1 or GB/T 20936.4 and are used in industrial and commercial safety applications. Guidelines and recommended operating procedures for the selection, installation, safe use and maintenance of Class I combustible gas detectors and Class I combustible gas detectors for underground coal mines. This document applies to oxygen detectors that achieve explosion protection requirements by excluding oxygen through inertization rather than excluding flammable gases or vapors. A similar application is the measurement of oxygen during the inerting of goafs in underground coal mines. This document is a collection of practical knowledge applicable to the use of electronic signals from gas sensors to form meter readings and to activate preset audible and visual alarms. A device that indicates the presence of a flammable or potentially explosive gas or vapor/air mixture by activating an alarm, or activating other devices, or a combination of the above Because the accumulation of flammable gas/air mixtures may be hazardous to life and property, such equipment may be used to It can also be used to initiate specific safety measures (e.g. equipment shutdown, evacuation, initiation of fire-fighting procedures). This document applies to fixed installations and mobile equipment. This document also applies to the safe use of portable detectors. Modern equipment of this type also includes oxygen deficiency detection and/or specific toxic gas sensors, for which additional guidance is given. In this document, flammable gases include flammable vapors unless otherwise specified. Due to the measurement techniques currently used, haze is not included in this document. This document applies to Class II detectors (used in industrial and commercial safety applications, in places divided into areas according to GB 3836.14). equipment) and Class I detectors. Equipment included in this document. a) Fixed detectors, including equipment mounted on vehicles; b) Mobile detectors; c) Portable detectors. The following equipment is not covered by this document but may provide useful information. a) Detectors that only detect non-flammable toxic gases; b) Experimental or scientific research equipment used only for analysis or measurement; c) detectors used only for process control; d) Detectors used in the manufacture and processing of explosives; e) Detectors used to detect explosive atmospheres caused by dust or mist in the air.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 3836.1 Explosive atmospheres Part 1.General requirements for equipment (GB/T 3836.1-2021, IEC 60079-0. 2017,MOD)

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 20936.2-2024_English be delivered?

Answer: Upon your order, we will start to translate GB/T 20936.2-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 6 ~ 9 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 20936.2-2024_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 20936.2-2024_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 [email protected]. 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.

Question 5: Should I purchase the latest version GB/T 20936.2-2024?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 20936.2-2024 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.