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GB/T 23711.1-2019 English PDF (GBT23711.1-2019)

GB/T 23711.1-2019 English PDF (GBT23711.1-2019)

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GB/T 23711.1-2019: Test method for pressure vessels lined with plastics -- Part 1: Spark testing

This Part of GB/T 23711 specifies the principle, test equipment, sample, test method, test result judgment and test report of the spark testing of steel pressure vessels lined with plastics.
GB/T 23711.1-2019
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 71.120;83.140
G 94
Replacing GB/T 23711.1-2009
Test method for pressure vessels lined with plastics -
Part 1: Spark testing
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 ... 5
2 Principle ... 5
3 Test equipment ... 5
4 Sample ... 6
5 Test method ... 6
6 Test result judgment ... 7
7 Test report ... 7
Appendix A (Informative) Spark test report ... 8
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 1st 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 23711.1-2009, Spark test method for pressure vessels lined with fluoroplastics; compared with GB/T 23711.1-2009, 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);
-- Delete the normative references (see Chapter 2 of version 2009);
-- Modify the expression of the principle (see Chapter 2, Chapter 3 of version 2009);
-- Modify the expression of test equipment (see Chapter 3, Chapter 4 of version 2009);
-- Add requirements for the accuracy level of voltmeters; add a note on the name of the spark detector (see 3.1);
-- Add requirements for the spark detector probe (see 3.2);
-- Modify requirements for the sample (see Chapter 4, Chapter 5 of version 2009);
Test method for pressure vessels lined with plastics -
Part 1: Spark testing
1 Scope
This Part of GB/T 23711 specifies the principle, test equipment, sample, test method, test result judgment and test report of the spark testing of steel pressure vessels lined with plastics.
This Part applies to the spark 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 Principle
For the spark detector, set a minimum test voltage; scan the plastic lining through the probe. When there are defects such as micropores and cracks in the plastic lining, they are broken down under the test voltage to form a short circuit, and the electric spark detector emits an alarm sound or a spark appears at the probe.
3 Test equipment
3.1 Electric spark detector
The output voltage of the electric spark detector is divided into DC and AC. DC shall be connected into a loop; AC is not required. Its output voltage range should be 5 kV ~ 20 kV; the accuracy level of the voltmeter shall be no less than level-2.5.
Note: Electric spark detector is also known as spark leak detector and pinhole detector.
3.2 Electric spark detector probe
According to the shape of the container, the electric spark detector can choose rod, plate, round, semi-circular, ring, fan, rake and other probes.

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