GB/T 31565-2015 Determination of edge coverage of enamel steel plates for heat exchangers GB/T31565-2015 Standard compression package decompression password: www.bzxz.net
This standard specifies the test method for determining the edge coverage of enamel steel plates for heat exchangers of all enameling processes. This standard is applicable to enamel plates with a thickness of 0.5mm~1.5mm. This method is not applicable to tests with a test current greater than 3A.
This standard was drafted in accordance with the rules given in GB/T1.1-2009.
This standard is equivalent to ISO28723:2008 "Determination of edge coverage of enamel steel plates for enameled heat exchangers".
The Chinese documents that have a consistent correspondence with the international documents normatively referenced in this standard are as follows:
———GB/T6682—2008 Specifications and test methods for water for analytical laboratories (ISO3696:1987, MOD)
Please note that some contents of this standard may involve patents. The issuing organization of this standard does not assume the responsibility for identifying these patents.
This standard is proposed by the China Machinery Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Metallic and Non-metallic Coatings (SAC/TC57). The
drafting units of this standard are Donghua University, National Eyeglass Glass Enamel Products Quality Supervision and Inspection Center, Wuxi Bakdur Technology Co., Ltd., and Zhejiang Kaier New Materials Co., Ltd. The
main drafters of this standard are Guo Lin, Jiang Weizhong, Zhang Guoxiu, Xu Xiaojian, Li Xin, and Xing Hanxue.
The following documents are indispensable for the application of this document. For any dated reference, only the dated version applies to this document. For any undated reference, the latest version (including all amendments) applies to this document.
ISO 3696 Water for analytical laboratory use—Specification and test methods
EN 10088-1 Stainless steels—List of stainless steels
Foreword III
1 Scope 1
2 Normative references 1
3 Principle 1
4 Reagents and materials 1
5 Apparatus 1
6 Test specimens 4
7 Test procedure 4
8 Expression of results 4
9 Precision 5
10 Test report 5

ICS 25.220.50
National Standard of the People's Republic of China
GB/T 315652015/ISO 28723.2008 Determination of the edge coverage of enaxmellad steel plate to be user in heat exchangers(ISO 28723:2008.10T)
Issued on 2015-05-15
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
2016-01-C1Implementation
Normative references
Reagents and materials
7 Test procedures
Expression of results
Cake density
Test report
GB/T 31565--2015/ISO 28723:2008 Foreword
This standard is based on the rules given in GB/T 1.1…2009. CB/T 31565--2915/1S 28723:2008 This standard is equivalent to ISO 28723:2008 "Determination of edge coverage of ceramic plates for heat exchange with ceramics". The international documents with consistent correspondence with the normative references in this standard are as follows: - GB/T 6682-2008 Specification and test methods for water for analytical laboratories (1503696:1987, MOD) Please note that some contents of this standard may involve patents. The issuing agency of this standard does not assume the responsibility for identifying these patents. This standard was proposed by the China Machinery Industry Federation and is under the jurisdiction of the National Technical Committee for Standardization of Metallic and Non-metallic Coverings (AC/TC57). This standard was drafted by Donghua University, National Eyeglass Glass and Porcelain Products Quality Supervision and Inspection Center, Wuxi Danke Durla Technology Co., Ltd., Zhejiang Kaier New Materials Co., Ltd. The main drafters of this standard are Guo Lin, Jiang Weizhong, Zhang Guo, Xu Liu, Li Xin, and Xie Yixue. 1 Scope
GB/T 31565—2015/ISO28723:2008 Determination of the edge coverage of steel plates for heat exchangers with sugar coating This standard specifies the test method for determining the edge coverage of steel plates for heat exchangers with all sugar coating processes. This standard is applicable to ceramic plates with a thickness of 0.5mm to 1.5mm. This method is not applicable to tests with a test current greater than 3A. 2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. ISO3696 Water for analytical laboratory use—Specification and test methods.
EN10088-1 Stainless steels List of stainless steels 3 Principle
Immerse the edge of the sample in the dielectric solution, then connect an AC regulated power supply to the sample, and calculate the edge coverage of the sample based on the measured current value.
Reagents and materials
Analytical pure reagents, distilled water or deionized water should be used in the test. 4.1 Pickling solution
The pickling solution consists of (7±0.5)% mass fraction of H.S0 and a concentration of (2±1.5)g /L Fe+ composition, temperature (60±2)℃4.2 Test tank dielectric solution
The test tank dielectric solution is a 5% sodium chloride solution prepared with grade 3 steamed stuffing water in accordance with 1SO3696, and the temperature is (22±3)℃.
5.1 Test tank
The test tank is made of polyolefin, and the container is equipped with electrodes and a polypropylene center positioning plate. The polyolefin center positioning plate is used to center and fix the sample 10 away from the bottom of the test tank. mrm high position 1. The arrangement and dimensions of the test tank components are shown in Figures 1, 2 and 31 respectively. GB/T31565-2015/IS028723:2008: 1—Test sample; 2—Center positioning plate, used to center and fix the test sample. Figure 1 Dimensions of the test tank Description: Electrode (length 1 264 m);
-chlorinated solution.
Figure 2 Dimensions of two corrosion-resistant stainless steel electrodes (EN10088-1 grade 1.4301) in millimeters
in millimeters
5.2 Power supply
GB/T31565—2015/IS028723:2008 in millimeters
Figure 3 Dimensions of two polypropylene center positioning plates The power supply is composed of a (10.0±0.05)V AC regulated power supply. The circuit is shown in Figure 4. It should be ensured that the voltage is stable within the range of (10.0±0.05)V throughout the test. L1
Figure 4 Circuit diagram
Ammeter
Accuracy 0.01A.
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GB/T 31565-2015/ISO 28723:20086 Test specimen
Select at least one pair of test plates of the same length, one positioning plate and one corrugated plate, with the test edge length of at least 300 mm. Immerse the test specimen in the pickling solution (4.1) for 10 min±10 s, then rinse it with water and dry it. 7 Test steps
According to the product design drawing, measure the total length of the edges of the positioning plate and the corrugated plate test specimen (i.e. the developed length of the test specimen) to the nearest 1 mm. Note: The developed length of the edge refers to the length that takes into account the shape layer of the sample positioning pole and the corrugated pole surface. Measure the thickness of the test specimen when it is not coated with enamel to the nearest 0.1 mm. Within 1 h after the sample is pickled, place the sample in the test enamel (5.1) to ensure that the test edge (the edge facing the flue gas direction) is less than 10 mm. Connect the power supply (5.2) to the two electrodes, connect the electrode L1 to the sample, pass the socket (3 + 0.5)s lip, and let the ammeter (5.3) record the current value.
Repeat the above test for one edge of the sample facing the smoke direction, and then repeat the above test for two other edges. The results are shown in the figure below:
For each edge of the sample, use formula (1) to calculate the coated surface area: --1.222r2 + 12.9c31
Wherein:
-uncoated surface area, in square millimeters (mm\); -measured current, in amperes (A); Use formula (2) to calculate the percentage S of the uncoated surface area: = × 100%
Wherein:
-uncoated surface area (%):
a-uncoated surface area, calculated by formula (1), in square millimeters (nm); -expanded length of the sample edge, in millimeters (mm); b
-thickness of the uncoated substrate, in millimeters (mm). Calculate the edge coverage rate percentage E using formula (3): E-1-S
(1)
Finally, take the arithmetic mean of all the edge measurement results E of the samples as the edge coverage rate, and round the data to the nearest 0.1%. Calculate the uncoated surface area U per meter length using formula (4), in square millimeters per meter (mm*/m): U-
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Finally, take the arithmetic mean of all the edge measurement results U of the samples as the coated surface area per meter length, and round the data to the nearest 10mm/m
Precision
The precision of this measurement is:
Edge coverage rate percentage: ±0.3%;
Uncoated surface area per meter length: ±2 mm2/m. 10
Test report
The test report shall contain the following:
All necessary information of the specimen;
Adopted standard (number of this standard);
Test results, calculation description in Chapter 8, expressed as: ".Average edge coverage, data rounded to zero, accurate to 0.1%; GB/T31565-2015/IS028723-2008 Average uncoated surface area per meter, data rounded to 10mm/m. Any deviation from the specified procedure;
Any abnormality observed during the test;
Test date.
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GB/T31565-2015
Print date: June 21, 2015 F009
People's Republic of China
National Standard
Determination of the edge coverage rate of sugar porcelain on steel plates for heat exchangers GB/T 31565-2015/1S0 28723-2008*
Published by China Standards Press
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