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GB/T 21782.4-2008: Coating powders -- Part 4: Calculation of lower explosion limit
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Coating powders -- Part 4: Calculation of lower explosion limit
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GB/T 21782.4-2008
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Basic data | Standard ID | GB/T 21782.4-2008 (GB/T21782.4-2008) | | Description (Translated English) | Coating powders -- Part 4: Calculation of lower explosion limit | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A80 | | Classification of International Standard | 13.300 | | Word Count Estimation | 5,511 | | Date of Issue | 2008-05-12 | | Date of Implementation | 2008-09-01 | | Quoted Standard | GB/T 3186-2006; ISO 1928-1995; ISO 6184-1-1985 | | Adopted Standard | ISO 8130-4-1992, IDT | | 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 powder coating method for calculating the lower explosion limit, ie powder coating of dust in the air can form an explosive mixture with the lowest concentration. Calculation, the required ISO 1928-1995 on total product of the measured calorific value, or the product of each component based on the total calorific value. In order to obtain a reliable measurement data, you need a special instrument to measure the explosion of combustible dust in air index, this method is described in ISO 6184-1-1985. But this instrument is not easy to obtain, and the method is very complex, not only have the expertise, and the cost is relatively large. Experience shows that the method of calculation used in coatings explosion limit when the workplace or make satisfactory. | GB/T 21782.4-2008: Coating powders -- Part 4: Calculation of lower explosion limit---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.
Coating powders Part 4. Calculation of lower explosion limit
ICS 13.300
A80
National Standards of People's Republic of China
GB/T 21782.4-2008/ISO 8130-4.1992
Powder Coatings
Part 4. Calculation of lower explosion limit
(ISO 8130-4.1992, IDT)
Posted 2008-05-12
2008-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 21782 "powder coating" is divided into 14 parts, the structure and corresponding international standards are as follows.
--- Part 1. Determination of particle size distribution by sieving (ISO 8130-1.1992, IDT);
--- Part 2. Determination of density (Arbitration Act) compare the proportion of gas meter method (ISO 8130-2.1992, IDT);
--- Part 3. Determination of liquid displacement pycnometer density (ISO 8130-3.1992, IDT);
--- Part 4. Calculation of lower explosive limit (ISO 8130-4.1992, IDT);
--- Part 5. Powder/air mixture Determination of flow characteristics (ISO 8130-5.1992, IDT);
Measured at a given temperature thermosetting powder coating of gel time (ISO 8130-6..1992, IDT) --- Part 6;
--- Part 7. Determination (ISO 8130-7.1992, IDT) mass loss during baking;
--- Part 8. Evaluation of the storage stability of thermosetting powders (ISO 8130-8.1994, IDT);
--- Part 9. Sampling (ISO 8130-9.1992, IDT);
--- Part 10. Determination of deposition efficiency (ISO 8130-10.1998, IDT);
--- Part 11. ramp flow test (ISO 8130-11.1997, IDT);
--- Part 12. Determination of compatibility (ISO 8130-12.1998, IDT);
--- Part 13. Laser diffraction particle size analysis (ISO 8130-13.2001, IDT);
--- Part 14. Terminology (ISO 8130-14.2004, IDT).
This is Part 4 GB/T 21782 of.
This section identical with the international standard ISO 8130-4.1992 "powder coatings - Part 4. Calculation of lower explosive limit" (in English), the package
Including its Technical Corrigendum ISO 8130-4.1992TECHNICALCORRIGENDUM1.
This part of ISO 8130-4.1992 as compared to doing the following editorial changes.
--- With "GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528.2000, IDT)" Generation
For "ISO 842. 1984 Paints and varnishes - Sampling of raw materials" (ISO 842. 1984 has been canceled, the ISO 15528.2000
instead);
"." --- With a decimal point instead of a comma as the decimal point, "";
--- Delete international standards foreword.
This part of the National Chemicals Management Standardization Technical Committee dangerous (SAC/TC251) and focal points.
This part mainly drafted by. Guangdong CIQ, in the construction of Changzhou coating Chemical Research Institute, Marine Chemicals Research Institute, Sinochem
Chemical Standards Institute, Hubei Exit Inspection and Quarantine.
The main drafters of this section. Mo Man, Liu Jianbin, Lee Jun, Wang Xiaobing, Zhong Zhiguang, Dicui Ping, Pang-speed standard, Shen Jiang Su, Mao Leilei,
VETERINARY Liqing Xiang.
This section first release.
GB/T 21782.4-2008/ISO 8130-4.1992
Powder Coatings
Part 4. Calculation of lower explosion limit
1 Scope
GB/T 21782 This part provides the lower limit of a computational method for powder coating explosion that powder coating of dust in the air can
The lowest concentration forming an explosive mixture. When calculations, based on ISO 1928.1995 measured the total calorific value of products, or products based on each
Gross calorific value components.
In order to obtain reliable measurement data, we need a special instrument to measure the exponential explosion of combustible dust in the air, this method
ISO 6184-1. 1985 are described. But this instrument is not easy to obtain, and the method is very complicated, not only to have the expertise and
Costs are relatively large. Experience has shown that the calculation results of the lower explosive limit at the time of application of the coating workplace is satisfactory.
Note 1. If kind of like polyvinyl chloride as non-combustible powder coatings, which still can be a limit under air explosion. Thus, there can be
Effectively avoid any risk of explosion underestimated.
Note 2. The method used to calculate this section based on the following assumptions.
a) the material should be a molecular dispersion;
b) should be able to complete combustion of the material, and can achieve the highest oxidation state;
c) the reaction should adiabatic type;
When d) meet the minimum explosive concentration in the air component of the combustion temperature of 1000 ℃.
2 Normative references
The following documents contain provisions which, through reference GB/T 21782 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528.2000, IDT)
ISO 1928.1995 Solid mineral fuels by bomb calorimeter to measure gross calorific value and calculation of net calorific value
The first part of the 1985 explosion suppression system.. determination of airborne combustible dust explosion indices ISO 6184-1
3 Terms and Definitions
The following terms and definitions apply to this section.
3.1
Lower Explosive Limit refers to a mixture of air and powder coatings, and powder coatings at concentrations below a certain value, self-propagating flame does not occur
explosion. This concentration is known as "lower explosive limit", expressed in grams per cubic meter.
4 Sampling
Extracting a representative sample of the test product according to GB/T 3186-2006 the provisions.
Determination of gross calorific value of 5
In accordance with 1928 ISO . Test Method 1995 products in the total calorific value H0, or in accordance with Part 6 of this chapter requirements,
Calculate the sum of the product of the total calorific value of the combustible components.
GB/T 21782.4-2008/ISO 8130-4.1992
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