GB/T 23711.4-2019 PDF EnglishUS$175.00 · In stock · Download in 9 seconds
GB/T 23711.4-2019: Test method for pressure vessels lined with plastics - Part 4: Negative pressure inspection Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 23711.4: Historical versions
Similar standardsGB/T 23711.4-2019: Test method for pressure vessels lined with plastics - Part 4: Negative pressure inspection---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT23711.4-2019 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.120;83.140 G 94 Replacing GB/T 23711.4-2009 Test method for pressure vessels lined with plastics - Part 4: Negative pressure inspection 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 ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Principle ... 5 4 Test equipment ... 6 5 Sample ... 7 6 Test method ... 7 7 Test result judgment ... 8 8 Test report ... 8 Appendix A (Informative) Negative pressure test report ... 10ForewordGB/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 4th 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 23711.4-2009, Vacuum test method for pressure vessels lined with fluoroplastics; compared with GB/T 23711.4-2009, 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); -- Modify the normative references (see Chapter 2, Chapter 2 of version 2009); -- Add “Principle” (see Chapter 3); -- Modify requirements for the test equipment (see Chapter 4, Chapter 3 of version 2009); -- Add schematic diagram of the test equipment structure (see Figure 1); -- Modify requirements for the sample (see Chapter 5, Chapter 4 of version 2009); -- Delete requirements for the maximum temperature of the vacuum test (see Table 1 of version 2009); Test method for pressure vessels lined with plastics - Part 4: Negative pressure inspection1 ScopeThis Part of GB/T 23711 specifies the principle, test equipment, sample, test method, test result judgment and test report of the negative pressure inspection of steel pressure vessels lined with plastics. This Part applies to the negative 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 referencesThe 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 1226, General pressure gauge GB/T23711.1, Test method for pressure vessels lined with plastics - Part 1: Spark testing JJG 874, Verification Regulation of Temperature Indication Controller JB/T 6533, Sliding vane rotary vacuum pump JB/T 7674, Roots vacuum pump JB/T 7675, Piston vacuum pump3 PrincipleUnder the specified temperature, use a vacuum pump to evacuate the test sample; after reaching the specified test pressure, hold it for a certain period of time; determine whether the sample is qualified according to whether the lining has obvious deformation or cracking. 6.2.3 For the negative pressure test that has temperature requirements, set the corresponding temperature value according to the design requirements or the user's requirements; turn on the temperature controller to warm up; after reaching the temperature, preserve heat for 1 h. 6.2.4 Turn on the vacuum pump; it should reach the negative pressure value that is required by the test within 30 min and maintain the pressure for 1 h. When evacuating, the condition that the internal temperature of the sample drops is ignored; observe whether the plastic lining is damaged through the sight glass. 6.2.5 Under the specified temperature conditions, when the ultimate negative pressure resistance is measured, gradually increase the test vacuum in the range of 0.01 MPa; maintain at each vacuum for 2 ~ 3 minutes until the sample lining is damaged. 6.2.6 When the interior of the sample reaches full vacuum and has not been damaged, apply external pressure between the outer surface of the plastic lining and the inner surface of the metal shell; use the method of external negative pressure to simulate a higher negative pressure, so as to determine the damage limit. 6.2.7 If the sample does not meet the requirements, or it cannot pass one of the above steps, correct the cause of the damage, or reduce the test conditions and re-test.7 Test result judgment7.1 Use naked eyes to observe the plastic lining; if there is obvious deformation, cracking and the like, it is regarded as damage. 7.2 Use naked eyes to observe the sample; if it is not damaged, perform a spark testing according to the method that is specified in GB/T 23711.1; if it meets the requirements, judge that the sample is qualified for the negative pressure test at the test temperature (normal temperature or high temperature). 7.3 The nominal value of the sample's resistance to negative pressure shall not exceed 80% of the negative pressure damage limit value.8 Test report8.1 The test report shall include the following: a) report number; b) name of the manufacturer; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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