GB/T 12474-2008 English PDF

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GB/T 12474-2008: Method of test for explosion limits of combustible gases in air
Status: Valid

GB/T 12474: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12474-2008	169	Add to Cart	3 days	Method of test for explosion limits of combustible gases in air	Valid
GB/T 12474-1990	199	Add to Cart	2 days	Method of test for explosion limits of combustible gases in air	Obsolete

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Basic data

Standard ID: GB/T 12474-2008 (GB/T12474-2008)
Description (Translated English): Method of test for explosion limits of combustible gases in air
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: C80
Classification of International Standard: 13.220.01
Word Count Estimation: 7,727
Date of Issue: 2008-06-24
Date of Implementation: 2009-03-01
Older Standard (superseded by this standard): GB/T 12474-1990
Quoted Standard: GB/T 5907-1986
Adopted Standard: ISO 10156-1996, NEQ
Regulation (derived from): National Standard Approval Announcement 2008 No.10 (Total No.123)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the method for determination of explosion limits of combustible gases in the air. This standard applies to the determination of the limits of combustible gas under atmospheric explosion in the air.

GB/T 12474-2008: Method of test for explosion limits of combustible gases in air

---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.
Method of test for explosion limits of combustible gases in air ICS 13.220.01 C80 National Standards of People's Republic of China Replacing GB/T 12474-1990 Explosive limit combustible gases in air Determination (ISO 10156.1996, Gasesandgasmixtures-Determinationoffirepotentialand oxidizingabilityfortheselectionofcylindervalveoutlets, NEQ) Posted 2008-06-24 2009-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This corresponds to the standard ISO 10156.1996 "Gases and gas mixtures cylinder valve port selecting fire potential and oxidizing ability measured Given "second edition (in English), non-equivalent, the main differences are as follows. --- Remove the calculation method of "air of flammable gases and gas mixtures" in; --- Delete the words "oxidation gases and gas mixtures" experiment and calculation; --- Remove the appendix; --- This standard can be the entire device is heated to a maximum of 50 ℃ test. This standard replaces GB/T 12474-1990 "Determination of explosion limits of combustible gases in the air." This standard and GB/T 12474- The main changes compared to 1990 are as follows. --- Increasing the "Introduction"; --- Added "normative references"; --- Increase the terms of entry; --- Increasing the test principle; --- Valve added other ways; --- Increasing the explosions of judgment; --- Standard text format press on GB/T 1.1-2000 made editorial changes. Please note that some of the content of this standard may involve proprietary content. The standard release mechanism should not bear the identification of these patents responsibility. The standard proposed by the People's Republic of China Ministry of Public Security. This standard by the National Standardization Technical Committee on Fire First Technical Committee (SAC/TC113/SC1) centralized. This standard is drafted by. Ministry of Public Security in Tianjin Fire Research Institute. Participated in the drafting of this standard. Tianjin Public Security Fire Department. The main drafters of this standard. Li Jin, Zhang net, Kim Sun Hong, Zhang Xin, MA Yu River, Wang Jie, BIMONTHLY fruit Chunsheng, Wang Gang, Ren Changxing, Lu Dong. This standard replaces the standards previously issued as follows. --- GB/T 12474-1990.

Introduction

Explosive limit combustible gases used in hazard classification. There are explosive process equipment allowable concentration of combustible gases, explosive Computing environment gas ventilation and heating systems, hot work safety when concentrations are determined with the explosion limit of the parameters. The method according to this standard is not formed flame spread and ignited flammable gas-air mixture, not fully consider the mixed gas is not Explode. Explosive limit combustible gas and air mixture to the following factors. a) the type of combustible gas and chemical properties; b) the purity of the combustible gas; c) the uniformity of combustible gas and air mixture; d) in the form of an ignition source, energy and ignition position; e) explosive containment vessel geometry and dimensions; f) the temperature of the combustible gas and air mixture, pressure and humidity. Explosive limit combustible gases in air Determination

1 Scope

This standard specifies the method for determination of explosion limits of combustible gases in the air. This standard applies to the determination of the limits of combustible gas explosion at atmospheric pressure in air.

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 5907-1986 fire first part basic terms

3 Terms and Definitions

GB/T 5907-1986 and established the following terms and definitions apply to this standard. 3.1 Combustible gas and air mixture consisting of fire source that can explode lowest concentration of combustible gases. 3.2 Combustible gas and air mixture consisting of fire source that can explode the highest concentration of combustible gases. Test Method 4 4.1 Test principle The combustible gas and air mixing by a certain percentage, then conduct spark ignited combustible gas concentration change can occur until the measured Lowest explosion, the highest concentration. 4.2 test device Explosion limit measuring device consists of the reaction tube, an ignition device, a stirring device, a vacuum pump, a pressure gauge, solenoid valves, etc., shown in Figure 1. anti- Should be made of hard glass tubes, tube length 1400mm ± 50mm, inner diameter 60mm ± 5mm, the wall thickness not less than 2mm, the bottom of the tube Equipped with pressure relief valve diameter not less than 25mm of. The device can be placed in a warmed to 50 ℃ incubator. Incubator before and after each double door, Tempered glass layer, a layer of plexiglass to observe the test and play a protective role. The minimum ignition of combustible gas and air mixture use spark ignition, spark energy should be greater than the mixed gas can. Discharge electrode distance Bottom of the reaction tube is not less than 100mm, and in the center of the tube cross-section, electrode spacing of 3mm ~ 4mm. Note. can be used as the ignition voltage transformer 300VA power supply, a voltage is 10kV (RMS), the spark duration is preferably 0.5s. 4.3 Test procedure 4.3.1 Check tightness test apparatus The apparatus was evacuated to not more than 667Pa (5mmHg) degree of vacuum, and then stop the pump. 5min after the pressure drop is less than the pressure gauge 267Pa (2mmHg), tightness is considered to meet the requirements. 4.3.2 preparation of mixed gas Preparation of mixed gas partial pressure method can also be used with other gas accurate manner. ......

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