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GB/T 34710.3-2018 PDF in English


GB/T 34710.3-2018 (GB/T34710.3-2018, GBT 34710.3-2018, GBT34710.3-2018)
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GB/T 34710.3-2018: PDF in English (GBT 34710.3-2018)

GB/T 34710.3-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.40
G 86
Classification of the mixture gas -
Part 3. Flammable classification
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Terms and definitions ... 4 
3 Flammable classification and determination of mixture gas ... 4 
Appendix A (Informative) Tci values of some flammable gases ... 9 
Classification of the mixture gas -
Part 3. Flammable classification
1 Scope
This Part of GB/T 34710 specifies the method for flammable classification of
mixture gas.
This Part applies to the flammable classification of mixture gas in air.
This Part does not apply to mixture gas having oxidizing components and a
tendency to oxidize.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1 Flammable mixture gas
A mixture gas which can be ignited in air at atmospheric pressure and at 20 °C.
2.2 Nonflammable mixture gas
A mixture gas which does not conform to 2.1.
3 Flammable classification and determination of
mixture gas
3.1 Classification
The flammability of mixture gas is divided into the following two categories.
- Flammable mixture gas;
- Nonflammable mixture gas.
3.2 Conversion coefficient of some nonflammable gases equivalent to
nitrogen
The conversion coefficient Kk of some nonflammable gases equivalent to
nitrogen is shown in Table 1.
Kk - Conversion coefficient of nonflammable gas k in mixture gas equivalent to
nitrogen.
Note. The mole fraction of all gases in this Part is equivalent to the volume fraction under
atmospheric conditions.
3.3.1.2 Determination
When x is less than or equal to 1, the mixture gas is nonflammable, otherwise
it is flammable.
3.3.2 Determination method 2
The mixture gas which conforms to formula (3) is nonflammable, otherwise it is
flammable.
3.4 Calculation and determination examples
3.4.1 Example 1
Calculate the flammable gas content in the mixture gas having a hydrogen
content of 7×10-2 (mole fraction) and a carbon dioxide content of 93×10-2 (mole
fraction), equivalent to that in nitrogen. The flammability of the mixture gas is
determined.
a) Calculation steps
1) Hydrogen in the mixture gas is a flammable gas; and the carbon dioxide
is a nonflammable gas. According to Table 1, the Kk value of carbon
dioxide is 1.5. According to formula (2), calculate A'i as follows.
2) Refer to Appendix A; the Tci value of hydrogen is 5.5×10-2 (mole
fraction). Calculate according to formula (1) as follows.
b) Flammable determination
(mole fraction)
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.