GB/T 23711.6-2019 English PDF (GBT23711.6-2019)

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GB/T 23711.6-2019: Test method for pressure vessels lined with plastics -- Part 6: Anti pressure testing
GB/T 23711.6-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.120;83.140
G 94
Replacing GB/T 23711.6-2009
Test method for pressure vessels lined with plastics -
Part 6: Anti-pressure testing
ISSUED ON: DECEMBER 10, 2019
IMPLEMENTED ON: NOVEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Test equipment ... 5 
4 Sample ... 6 
5 Test method ... 6 
6 Test result judgment ... 10 
7 Test report ... 10 
Appendix A (Informative) Anti-pressure test report ... 12 
Test method for pressure vessels lined with plastics -
Part 6: Anti-pressure testing
1 Scope
This Part of GB/T 23711 specifies the test equipment, sample, test method, test
result judgment and test report of the anti-pressure testing of steel pressure
vessels lined with plastics.
This Part applies to the anti-pressure inspection 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/T23711.1, Test method for pressure vessels lined with plastics - Part 1:
Spark testing
3 Test equipment
3.1 The test equipment shall be an electric or manual pressure test pump that
meets the measured pressure range.
3.2 The anti-pressure test device shall be equipped with two pressure gauges
that have the same measuring range and are qualified in the verification. The
accuracy level of the used pressure gauge shall not be less than level-1.6; the
limit value of the pressure gauge range shall be 1.5 ~ 3 times the maximum test
pressure; the diameter of the gauge shall not be less than 100 mm.
3.3 Select the appropriate pressure pipeline and sealing device according to
the test pressure range, so as to ensure that the pressure can be smoothly
increased and maintained during the test.
to increase the pressure to the specified test pressure; the pressure
holding time shall not be less than 30 min; then, decrease the pressure to
the designed pressure; keep it for enough time to perform the inspection;
remain the pressure unchanged during the inspection.
5.3.2 Tightness test
5.3.2.1 For the plastic-lined shell, a safety test shall be performed before the
tightness test of the steel pressure vessels lined with plastics.
5.3.2.2 The tightness test is performed after the lining is completed. The test
pressure shall be determined according to Formula (2). For the selected test
pressure, it shall fully consider the non-metallic sealing material and the
permanent plastic deformation after the body is pressurized, so as to evaluate
its influence on the subsequent sealing performance.
The meanings of pt, p, [σ], [σ]lt in the formula are shown in formula (1).
5.3.2.3 The test shall be carried out according to the following procedures and
steps:
a) Inject water into the sample and exhaust the air in the closed cavity.
b) After the sample is filled with water, slowly increase the pressure; the
pressure increase rate per minute is 10% of the test pressure; when the
pressure is increased to 30% ~ 50% of the test pressure, stop the pressure
increase for preliminary inspection; when there is no abnormal condition,
continue to increase the pressure to the designed pressure and check for
abnormal conditions. Continue to increase the pressure to the test
pressure when there is no abnormality; the holding time of the test
pressure shall be not less than 30 min. Under test pressure, no one shall
be near the sample.
c) During the test, observe the pressure gauge at any time; pay attention to
possible leakage, especially the connection and seal; during the pressure
holding process, maintain the pressure unchanged.
d) After the sample tightness test is completed, release the pressure, and
drain the water in the closed cavity. When discharging water, firstly open
the pipe orifice above the position of the test sample; then, open the lower
outlet; when releasing water, slow down the pressure release rate as
much as possible, so as to prevent the vacuum sucking down the plastic
lining.
5.5.1 For samples that cannot be filled with liquid due to load bearing and other
reasons, inject some liquid first according to the load-bearing capacity; then,
inject the gas, so as to perform a gas-liquid combined pressure test.
5.5.2 The test pressure shall be determined according to Formula (3); the
holding time shall be not less than 10 min.
5.5.3 The test method shall be carried out according to the methods that are
specified in 5.3 or 5.4, respectively.
5.5.4 After the gas-liquid combined pressure test, perform a spark testing in
accordance with the method that is specified in GB/T 23711.1.
6 Test result judgment
6.1 Hydraulic test
6.1.1 During the pressure holding process, the indicated value of the pressure
gauge shall have no obvious change, and the sample shall have no abnormal
sound.
6.1.2 During the test, use naked eyes to observe the sample; there shall be no
visible deformation, no leakage or cracks.
6.1.3 If it meets the requirements of 6.1.1 and 6.1.2, it is judged as qualified.
6.1.4 If there is leakage in the flange part of the sample, after the pressure is
released, tighten the fasteners on the flange to eliminate the leakage; perform
the re-inspection according to 5.3.
6.2 Gas pressure test
In the pressure-holding process, there shall be no obvious change in the
indicated value of the pressure gauge; the sample shall have no visible
deformation, abnormal sound, or damage. If there is no leakage in the soap
liquid or other leak detection liquid through test, it is judged to be qualified.
6.3 Gas-liquid combined pressure test
The gas-liquid combined pressure test shall be determined in accordance with
the provisions of 6.1 and 6.2.
7 Test report
7.1 The test report shall include the following:
a) the name of the manufacturer;