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GB/T 23711.3-2019 English PDF (GBT23711.3-2019)

GB/T 23711.3-2019 English PDF (GBT23711.3-2019)

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GB/T 23711.3-2019: Test method for pressure vessels lined with plastics -- Part 3: High-temperature inspection

This Part of GB/T 23711 specifies the principle, test equipment, sample, test method, test result judgment and test report of the high-temperature testing of steel pressure vessels lined with plastics.
GB/T 23711.3-2019
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 71.120;83.140
G 94
Replacing GB/T 23711.3-2009
Test method for pressure vessels lined with plastics -
Part 3: High-temperature inspection
ISSUED ON: DECEMBER 10, 2019
IMPLEMENTED ON: NOVEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Principle ... 6
4 Test equipment ... 6
5 Sample ... 7
6 Test method ... 7
7 Test result judgment ... 9
8 Test report ... 10
Appendix A (Informative) High-temperature test report ... 11
Foreword
GB/T 23711, Test method for pressure vessels lined with plastics, is divided into 8 parts:
-- Part 1: Spark testing;
-- Part 2: Low-temperature testing;
-- Part 3: High-temperature inspection;
-- Part 4: Negative pressure inspection;
-- Part 5: Cold-hot cycling inspection;
-- Part 6: Anti pressure testing;
-- Part 7: Leak testing;
-- Part 8: High-resistance testing.
This Part is the 3rd part of GB/T 23711.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 23711.3-2009, High temperature test method for pressure vessels lined with fluoroplastics; compared with GB/T 23711.3-2009, the main technical changes, except editorial changes, are as follows:
-- In "Scope", add plastic lining materials such as rigid polyvinyl chloride (PVC-U), chlorinated polyvinyl chloride (PVC-C), polyethylene (PE) (see Chapter 1, Chapter 1 of version 2009);
-- Modify contents of the normative references (see Chapter 2, Chapter 2 of version 2009);
-- Add the principle (see Chapter 3);
-- Add requirements for test chambers and tensile testing machines (see Chapter 4);
-- Modify requirements for the sample (see Chapter 5, Chapter 4 of version 2009);
-- Add requirements for labels and the like on the sample when there is anisotropy on the dimensions and materials of the sample (see 5.1 and
5.2, Chapter 4 of version 2009);
Test method for pressure vessels lined with plastics -
Part 3: High-temperature inspection
1 Scope
This Part of GB/T 23711 specifies the principle, test equipment, sample, test method, test result judgment and test report of the high-temperature testing of steel pressure vessels lined with plastics.
This Part applies to the high-temperature testing of steel pressure vessels lined with plastics such as rigid polyvinyl chloride (PVC-U), chlorinated polyvinyl chloride (PVC-C), polyethylene (PE), ethylene-tetrafluoroethylene copolymer (ETFE), fluorinated ethylene propylene (FEP), perfluoroalkoxy alkanes (PFA), polytetrafluoroethylene (PTFE), and polyvinylidene difluoride (PVDF), whose container shell material is steel.
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 edition (including all amendments) applies to this document.
GB/T 1040.2, Plastic. Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastic
GB/T 10592, Specification for low/high temperature test chambers
JB/T 7797-2017, Tensile testing machines for rubber and plastics
3 Principle
Cycle the sample at high temperature and room temperature; repeat for three cycles according to the prescribed time; perform tests of shape, dimensional change rate and mechanical property on the sample, so as to determine the high-temperature resistance of the steel pressure vessels lined with plastics. 4 Test equipment
4.1 Test chamber
7 Test result judgment
7.1 Determination of the sample
7.1.1 Use naked eye to observe the sample; if there is obvious deformation, cracking, bubble and the like, it is regarded as failure. If there is no such defect, the item is judged as qualified.
7.1.2 When a sample that passes the low-temperature testing is selected as the sample of the high-temperature testing, if it is judged as qualified in 7.1.1, both the high-temperature testing and the low-temperature testing in the test temperature range are judged as qualified at the same time.
7.2 Determination of the test piece
7.2.1 Shape
7.2.1.1 Use naked eye to observe the test piece; if there is obvious deformation, cracking and the like, it is regarded as failure. If there is no such defect, the item is judged as qualified.
7.2.1.2 When a test piece that passes the low-temperature testing is selected as the sample of the high-temperature testing, if it is judged as qualified in 7.2.1.1, both the high-temperature testing and the low-temperature testing in the test temperature range are judged as qualified at the same time.
7.2.2 Size
Measure the dimensions of the test piece that passes 3 high-temperature test cycles in every direction at room temperature. Calculate the dimensional change rate of the test piece according to Formula (1) and Formula (2). Take the arithmetic mean of the 3 test pieces as the test result; the numerical rounding interval of the test result is 0.01.
Where:
DL -- the dimensional change rate of the length direction of the test piece; L1 -- the length of the test piece after the test, in millimeters (mm); L0 -- the length of the test piece before the test, in millimeters (mm);

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