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GB/T 803-2008: Determination of explosion indices of combustible gases in air
Status: Valid GB/T 803: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 803-2008 | English | 174 |
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Determination of explosion indices of combustible gases in air
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GB/T 803-2008
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| GB/T 803-1989 | English | 319 |
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Determination of explosion indices of combustible gases in air
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GB/T 803-1989
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PDF similar to GB/T 803-2008
Basic data | Standard ID | GB/T 803-2008 (GB/T803-2008) | | Description (Translated English) | Determination of explosion indices 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Count Estimation | 9,962 | | Date of Issue | 2008-06-26 | | Date of Implementation | 2009-03-01 | | Older Standard (superseded by this standard) | GB/T 803-1989 | | Adopted Standard | ISO 6184-2-1985, IDT | | Regulation (derived from) | National Standard Approval Announcement 2008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 in a sealed container, the mixture of combustible gas explosion index measuring method and air. Other test methods and gives guidelines to follow when an explosion indices measured. | GB/T 803-2008: Determination of explosion indices 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.
Determination of explosion indices of combustible gases in air
ICS 13.220.01
C80
National Standards of People's Republic of China
GB/T 803-2008/ISO 6184-2. 1985
Replacing GB/T 803-1989
Explosion indices of combustible gases in air Determination
(ISO 6184-2. 1985, Explosionprotectionsystems-
Part 2. Determinationofexplosionindicesofcombustiblegasesinair, IDT)
Posted 2008-06-26
2009-03-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
1985 "Part 2 explosion protection system.. explosion indices of combustible gases in air Determination" ISO 6184-2 This standard is identical with the
(In English).
This standard is equivalent translation ISO 6184-2. 1985.
For ease of use, this standard made the following editorial changes.
--- "This International Standard" be replaced by "this standard";
"." --- With a decimal point instead of a comma as the decimal point, "";
--- Delete international standards foreword.
This standard replaces GB/T 803-1989 "Determination of explosion indices of combustible gases in air in." This standard and GB/T 803-1989 phase
Than the main differences are as follows.
--- Standard text format according to GB/T 1.1-2000 made editorial changes;
--- Introduction of content points;
--- The Chapter 1, "subject matter and scope" of the content is divided into "scope" and "application" two chapters;
--- Increased 4.1.
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 was drafted. Tianjin Fire Research Institute of Ministry of Public Security.
The main drafters. Zhang Xin, Li Jin, Zhang net, Sun incense, fruit Chunsheng, BIMONTHLY Wang Jie, Ren Changxing, Lu Dong.
This standard replaces the standards previously issued as follows.
--- GB/T 803-1989.
GB/T 803-2008/ISO 6184-2. 1985
Introduction
Explosive gas mixture explosion hazard Protection 0.1 pairs of combustible gas and air to evaluate and calculate the need of such pre-mixed gas measuring means
number. For verification explosion protection system performance, but also need to experiment with the explosion of known intensity.
Combustible gas and air mixture (hereinafter referred to as the mixed gas) explosion index and the following factors.
a) the chemical nature of the combustible gas;
b) concentration of combustible gas in the gas mixture;
c) uniformity and turbulence of the mixture;
d) the type of ignition source, energy and position;
e) the geometry and dimensions of the container;
f) pressure and temperature of the mixed gas.
0.2 The method according to the present standard given the explosion index determination and its relationship with the site of the explosion relations, especially the degree of turbulence explosion hazard
The impact should be described by the experts.
Extreme turbulence conditions common in the industry, there are two.
a) the gas in the vessel is at rest;
b) in the exhaust gas area of \u200b\u200bhigh turbulence state.
Turbulence following two ways.
a) Under normal operating conditions the workshop, due to turbulent air flow-forming gas;
b) means internal explosion expanding gases blocked, causing turbulence.
GB/T 803-2008/ISO 6184-2. 1985
Explosion indices of combustible gases in air Determination
1 Scope
This standard specifies in a sealed container, the mixed gas explosion indices of combustible gas and air measurement method, and gives other test methods
Guidelines to be followed explosion index measurement.
2 Applications
This standard applies only to the determination of explosion indices of the limited space after the gas mixture is ignited, it is not necessary for the application to ignite the mixture
He Index. If the test operation in accordance with this standard, no ignition of the mixture, the mixture can not be considered completely not explode, it should be based on the specific situation
Conditions shall be interpreted by experts.
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
In a sealed container or substantially sealed container, the combustible gases, suspended dust, combustible vapors, liquid mist or a mixture thereof, in a gaseous oxidation
Agents (such as air) flame propagation.
3.2
The number of values \u200b\u200bin a variety of 1m3 container, test methods specified in this standard by measuring the concentration of reactants certain explosive properties.
Note. Figure 1 shows a typical explosion pressure - time curve, and units are Pa s.
Figure 1 explosion pressure - time curve
GB/T 803-2008/ISO 6184-2. 1985
3.2.1
Vessel during the explosion, with respect to the maximum ignition pressure of overpressure.
3.2.2
3.2.3
NOTE. The above formula does not apply to a length to diameter ratio of more than 2.1, or volume of containers of less than 1m3.
3.2.4
K m1 Rao x0
Experimental determination of different concentrations of mixed gas explosion index K of the maximum. This value is used to estimate the extent of violent explosions.
3.3
Determination of the number represents the value of the degree of turbulence index test explosion.
3.3.1
Start the container gas injection and ignition time interval between the start. It indicates the degree of turbulence instant ignition.
3.3.2
T u
In accordance with the provisions of this standard, measured in turbulent state of Kmax, and turbulence in the stationary state determined Kmax, static ratio.
Tu = Kmax, turbulence Kmax, static
Test Method 4
4.1 Overview
Test equipment described in this standard is used for general purpose apparatus of explosion indices of combustible gases in air measurement.
4.2 test device
The main part of the apparatus is a cylindrical volume of 1m3 vessel, as shown in Figure 2, the ratio of length to diameter of 1.1.
An approximate capacity of cylinders 5L, pressurized air can be used to 2MPa, fast acting valves and by an inner diameter of 19mm steel
1m3 inner tube connected to a container. Quick action valve should open within 10ms, high-pressure cylinders 5L air injected into the inside 1m3 container.
The valve and the inner container 1m3 explosion inside diameter of the semicircular tube connection 19mm, drilled several semicircular tube diameter 4mm ~ 6mm
GB/T 803-2008/ISO 6184-2. 1985
Holes, holes with a total area of \u200b\u200babout 300mm2.
Mixture using spark ignition, spark energy should be greater than the minimum ignition energy test static or turbulent mixing gas mixture.
Note 1. should be used as the ignition voltage transformer 300VA power supply, generates a high voltage of 15kV (rms), duration of 0.5s induction spark.
Electrode spark discharge gap should be the geometric center of the container, distance between the electrodes is 3mm ~ 5mm.
Measurement of explosion pressure vessel and pressure sensor connected to the recorder.
Note 2. If the selection of ignition energy is too large, the result will be the result under low energy conditions are different.
2 a schematic diagram of a container explosion
4.3 Test procedure
4.3.1 static mixing gas explosion test
Formulated in a 1m3 container mixed gas, for example, the use of the partial pressure of the preparation method, the pressure of the gas mixture reaches atmospheric pressure. Should ensure that the mix
Aiki concentration accuracy and uniformity, and to ensure that the mixture in a quiescent state. Start pressure recorder, and then turn the ignition source explosion
test. After the completion of each test, should be purged using compressed air explosion vessel.
Variation curve Pa · m/s) and the combustible gas concentration (volume fraction% ---) between. Use curves to determine the exponential explosion
In some cases, due to geometrical factors and ignition factors, it may result in combustion instability, so that the pressure - time curve is different from the
1 shows a smooth S-shaped curve is shown.
GB/T 803-2008/ISO 6184-2. 1985
4.3.2 turbulent mixing gas explosion test
Formulated in a 1m3 container mixed gas with air in the compression cylinder gas 5L to 2MPa, starting pressure recorder, then start
Quick action valve, followed by open sources of ignition.
Note. It should take into account the influence of compressed air filling volume of combustible gas concentration with the. After the completion of each test, in order to purge air explosion vessel.
Index Kmax, shown in Figure 3.
GB/T 803-2008/ISO 6184-2. 1985
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