GB/T 18442.7-2017 PDF EnglishUS$145.00 · In stock · Download in 9 seconds
GB/T 18442.7-2017: Static vacuum insulated cryogenic pressure vessels - Part 7: Rules of pressure strengthening for inner vessels Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 18442.7-2017: Static vacuum insulated cryogenic pressure vessels - Part 7: Rules of pressure strengthening for inner vessels---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/GBT18442.7-2017 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.020.40 A 82 Static vacuum insulated cryogenic pressure vessels - Part 7.Rules of pressure strengthening for inner vessels Issued on. NOVEMBER 01, 2017 Implemented on. MAY 01, 2018 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms, definitions and symbols... 6 4 General requirements... 7 5 Material... 7 6 Design... 9 7 Manufacture and inspection... 11 Annex A (informative) Important quality control points during manufacturing process of pressure strengthening inner vessels... 18 Annex B (informative) Approximate control and requirements of Austenitic stainless-steel number... 20 Annex C (informative) Requirements for test of pressure strengthening process verification... 21 Annex D (informative) Test piece pre-tensile and test rules... 27 Annex E (normative) Pressure strengthening treatment... 311 ScopeThis Part of GB/T 18442 specifies the technical requirements for material, design, manufacture and inspection of the inner vessels of static vacuum insulated cryogenic pressure vessels (hereinafter referred to as the inner vessels) that are manufactured by pressure strengthening technology. This Part is applicable the inner vessels that meet the following conditions at the same time. a) in accordance with the provisions of 1.2 of GB/T 18442.1, the medium is frozen liquefied gas; b) the material is austenitic stainless steel; c) the nominal thickness is not less than 4mm and not more than 24mm, consisting of a single diameter cylinder and a standard oval head; d) the strain strengthening is completed at room temperature. This Part is not applicable to the inner vessels that contain mediums of which the toxicity hazard is moderate and above.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 150 (all parts), Pressure vessels GB/T 228.1, Metallic materials - Tensile testing - Part 1.Method of test at room temperature GB/T 229, Metallic Materials - Charpy Pendulum Impact Test Method GB/T 232, Metallic materials - Bend test GB/T 2653, Methods of bend and compression tests for welded joint GB/T 3808, Verification of pendulum-type impact testing machines GB/T 12160, Calibration of extensometers used in uniaxial testing GB/T 14976, Seamless stainless-steel pipes for fluid transport GB/T 16825.1, Verification of static uniaxial testing machines - Part 1. Tension/compression testing machines - Verification and calibration of the force-measuring system3 Terms, definitions and symbols3.1 Terms and definitions The terms and definitions defined in GB/T 18442.1 as well as the followings apply to this document. 3.2 Symbols The following symbols apply to this document. A - Elongation after break, %; Di - Inner diameter of cylinder or head, mm;4 General requirements4.1 In addition to all parts of this Standard, the material, design, manufacture and inspection as well as marks of the inner vessels shall also comply with the relevant laws, regulations, safety technical specifications and relevant standards promulgated by the country. 4.4 The manufacturer shall upload the mechanical performance data of the welded test piece and the data of the pressure strengthening test process to the national strain-enhanced cryogenic container manufacturing information public service platform. 4.5 The special equipment supervision and inspection agency shall supervise and inspect the pressure strengthening process adopted by the inner vessels and the important quality control points proposed in Annex A, which shall meet the requirements of this Part.5 Material5.1 Steel plate 5.1.1 The designation and mechanical properties of the steel plate shall comply with the requirements of Table 1.The supply status is solid solution heat treatment and meets the requirements of GB/T 150.2 and GB/T 24511. 5.1.3 The sampling quantity and position of tensile test shall be in accordance with the provisions of GB/T 24511 and GB/T 150.2. 5.1.4 The tensile sample size and test method shall comply with the provisions of GB/T 228.1. 5.1.5 When the tensile strength of steel plate is higher than 720 MPa, the welding procedure assessment shall be re-carried out according to 7.4.1.It shall be used after it is assessed as qualified. 5.2 Steel pipes and pipe fittings 5.2.1 The materials for steel pipes and pipe fittings shall comply with the provisions of GB/T 18442.2. 5.3 Forgings Stainless steel forgings in contact with the medium shall comply with the provisions of GB/T 18442.2 and NB/T 47010.Level is not lower than level III. 5.4 Welding materials 5.4.1 Welding materials shall comply with the corresponding provisions of GB/T 18442.2 and NB/T 47018.1~47018.4. 5.5 Overseas designation material When the inner vessel uses overseas designation, it shall be in accordance with Annex B. 5.6 Other material When using the materials other than Table 1 and Table B.1 to manufacture the inner vessels with the pressure strengthening technology, it shall also comply with the relevant provisions of TSG 21.6 Design6.1 General 6.1.1 In addition to the provisions of this Part, the design of the inner vessels shall also comply with the provisions of TSG 21, GB/T 150 and GB/T 18442.3. 6.1.5 The product nameplate shall be marked with “pressure strengthening vessel”, the symbol is “PS”. 6.2 Load 6.2.1 When designing the inner vessel, the corresponding load and its combination shall be considered in accordance with the provisions of GB/T 18442.3. 6.2.2 In the process of pressure strengthening treatment, the reaction force and the strengthening pressure load generated at the support of the inner vessel shall also be considered. 6.3 Allowable stress 6.3.1 The allowable stress of the steel plate for the cylinder and the head is determined according to Table 2. 6.4 Calculation of internal pressure The strength calculation of the inner vessels shall be in accordance with the provisions of GB/T 150.3.Other relevant calculations are in accordance with the provisions of GB/T 18442.3. 6.5 Calculation of external pressure 6.5.1 The calculation of external pressure stability of each component shall comply with the provisions of GB/T 150.3.The external pressure curve shall be selected according to the corresponding material at 20°C. 6.7 Strengthening pressure The strengthening pressure pk is calculated according to formula (1). 6.8 Pressure of pressure resistance test The pressure of pressure resistance test shall comply with the provisions of GB/T 18442.3. 6.9 Pressure of leak test Perform according to the provisions of GB/T 18442.3. 6.10 Structure design 6.10.1 Except the last closed ring welds, the type A and type B weld joints shall be full penetration butt joints. Closed ring welds allow the use of butt joints with permanent backing. 6.10.5 In the design of the structure, the influence of the plastic deformation of the inner vessel on the low-temperature insulation performance of the vessel, the installation of the outer casing and the piping system shall also be considered.7 Manufacture and inspection7.1 General 7.1.1 In addition to the provisions of this Part, the manufacture, inspection and acceptance of the inner vessels shall also meet the requirements of other parts of GB/T 18442 and design documents. 7.2 Material preparation 7.2.1 The cylinder’s adjacent tube of the inner vessel shall preferably use the same batch number and the same thickness of the steel plates. When using different batch materials, the difference of Rp0.2 of adjacent tube materials shall not exceed 30 MPa. 7.2.2 The steel plate for the inner vessel seal head shall be made of S30403 or S31603 material. 7.2.3 The splicing head shall be selected from the same batch number of steel plates. 7.3 Processing and forming 7.3.1 The processing of the inner vessel shall comply with the relevant provisions of GB/T 18442.4. 7.4 Welding 7.4.1 Welding procedure assessment 7.4.1.1 Before the welding of the inner vessel, the welding procedure assessment shall be carried out in accordance with the requirements of NB/T 47014 and this Part. 7.4.1.2 The welding joints of the welding procedure assessment test piece shall have no defects such as undercuts, cracks, surface pores, welding slag, pits, welds, etc. 7.4.1.4 When the pre-tensile test piece is made into a sample, the weld height is removed by mechanical means to make it flush with the base material. The sample’s sampling method, specification and processing shall comply with the corresponding provisions of GB/T 228.1, GB/T 229, GB/T 2653 and NB/T 47014, respectively. 7.4.4 Weld seam welding rework and welding after strengthening 7.4.4.1 After cylinder type A, B weld joints and adapters of which the nominal diameter is greater than 50mm are welding reworked with cylinder type D weld joint, the pressure strengthening treatment shall be re-carried out. And it shall be approved by the manufacturer’s technical leader. 7.4.5 Product welding test piece 7.4.5.1 The product welding test piece shall be prepared piece by piece. The test piece shall be welded at the same time at the extension of the longitudinal weld of the cylinder section and at the cylinder section. Before strengthening, perform longitudinal welding for the inner vessel of which the geometric volume is less than or equal to 5 m3. 7.5 Nondestructive testing 7.5.1 Testing before pressure strengthening implementation ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 18442.7-2017 be delivered?Answer: The full copy PDF of English version of GB/T 18442.7-2017 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 18442.7-2017_English with my colleagues?Answer: Yes. 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