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Basic dataStandard ID: GB/T 40073-2021 (GB/T40073-2021)Description (Translated English): External pressure strength test procedure for metal pressure hull of submersibles Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: U11 Word Count Estimation: 18,140 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 40073-2021: External pressure strength test procedure for metal pressure hull of submersibles---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. External pressure strength test procedure for metal pressure hull of submersibles ICS 47.020.10 U11 National Standards of People's Republic of China Test method for external pressure strength of metal pressure shell of submersible Released on 2021-04-30 2021-11-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee Table of contentsForeword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Test purpose 2 5 Test condition 2 5.1 Requirements for metal pressure shells (including pressure shell accessories) 2 5.2 Material 2 5.3 Documentation 2 5.4 Test equipment and instrumentation 3 5.5 Test medium 3 5.6 Test environment 3 5.7 Test pressure 3 6 Test content and method 3 6.1 Preparation before test 3 6.2 External pressure strength test 4 6.3 Test interruption and troubleshooting 8 7 Analysis and evaluation of test results 9 7.1 Test conclusion 9 7.2 Judgment of strain value 9 7.3 Calculation of stress value 9 7.4 Evaluation of test results 10 8 Test report 10 Appendix A (Normative Appendix) Calculation of Maximum Working Pressure of Submersible 12 Appendix B (Normative Appendix) Test Record Table 13 Appendix C (Normative appendix) Strain gauge resistance value and insulation resistance value inspection record table 14 Test method for external pressure strength of metal pressure shell of submersible1 ScopeThis standard specifies the test purpose, test conditions, and internal pressure of the submersible metal pressure shell (including the accessories of the pressure shell) for the external pressure strength test. Content and method and test report. This standard applies to the short-term hydrostatic external pressure test of submersible metal pressure shells (including pressure shell accessories). Other underwater devices and their pressure-bearing devices The prepared external pressure strength test can also be performed with reference to this standard. Note. The short-term hydrostatic external pressure test is an external pressure test that does not consider the effects of inertia and acceleration, the test medium is water and the test time is short.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 150.1-2011 Pressure Vessel Part 1.General Requirements GB/T 150.4-2011 Pressure Vessel Part 4.Manufacturing, Inspection and Acceptance GB/T 13407 Terminology for submersibles and underwater devices Rules for Classification and Construction of Diving Systems and Submersibles (China Classification Society.2013)3 Terms and definitionsGB/T 150.1-2011, GB/T 13407 and "Code for Classification and Construction of Diving Systems and Submersibles" and the following terms and The definition applies to this document. 3.1 Submersible The general term for various underwater operating appliances. Note. Submersibles include manned submersibles and unmanned submersibles. Manned submersibles are submersibles that carry occupants. They usually include operational manned submersibles and deep dive rescuers. Lifeboats, underwater excursion boats, diving bells, life-saving bells, single atmospheric diving suits and dual-function submersibles, etc.; unmanned submersibles are submersibles that do not carry occupants. Often include remotely operated submersibles, autonomous submersibles, underwater gliders and towed submersibles. 3.2 Metal pressure shell pressurehul The metal shell on the submersible can withstand the external sea water or fresh water pressure, providing a normal pressure and sealing for the occupants or instruments and equipment. space. 3.3 Pressurehulaccessory The structural parts or equipment installed at the openings of the metal pressure shell. Note. Such as electrical penetrations, hatch covers, observation windows, etc. 3.4 External pressure strength test A test conducted by applying external pressure to a metal pressure-resistant shell (including accessories of the pressure-resistant shell) to determine its bearing capacity without damage. 3.5 Outoftolerance The actual measured value exceeds the design allowable value. 3.6 Maximumworkingdepth The maximum operating or sailing depth at which a submersible can be safely used. Note. The unit is meter (m). 3.7 Maximum working pressure Relative to the water pressure at the maximum working depth. Note. The unit is megapascals (MPa).4 Test purposeThe purpose of the external pressure strength test of the metal pressure shell of the submersible (including the pressure shell accessories) is to pass the detection of tightness, strain and deformation or displacement. Test to verify the design reliability and construction quality of the submersible metal pressure shell (including pressure shell accessories). The test includes but is not limited to the following content. a) Test the tightness of the metal pressure shell of the submersible (including the pressure shell accessories); b) Measure the strain of the metal pressure shell of the submersible (including the pressure shell accessories); c) Measure the deformation or displacement of the metal pressure shell of the submersible (including the pressure shell accessories).5 Test conditions5.1 Requirements for metal pressure shells (including pressure shell accessories) 5.1.1 The metal pressure shell (including the accessories of the pressure shell) shall be inspected according to relevant quality after welding, heat treatment (if any) and assembly are completed. It is required that the external pressure strength test can only be carried out after the acceptance is passed. 5.1.2 The pressure that the pressure shell accessories can withstand should not be lower than the maximum working pressure of the submersible, and it should be able to ensure that the metal pressure shell opening seal. 5.1.3 When necessary, the following quality certification documents shall be provided. a) The material certification documents and re-verification records of the metal pressure shell (including the accessories of the pressure shell); b) Shape inspection records and wall thickness inspection records of metal pressure shells (including pressure shell accessories); c) Non-destructive inspection and repair records of welds of metal pressure-resistant shells (including pressure-resistant shell accessories); d) Out-of-tolerance measurement records and out-of-tolerance enhancement processing records of metal pressure shells (including pressure shell accessories); e) The pressure test qualification certificate of the pressure shell accessories. 5.2 Material When necessary, the material mechanical properties data and curves of the metal pressure shell (including the pressure shell accessories) should be provided, such as the elastic modulus E, Poisson's ratio μ, The tensile strength Rm, the yield strength Rp0.2 and the tensile/compression curve of the material, etc. 5.3 Documentation Before the test, the test client should prepare a test program, which should include the parameters of the metal pressure shell (including the accessories of the pressure shell), test requirements, and test program. Test content, test procedures, test results processing methods and test report content requirements, etc. 5.4 Test equipment and instrumentation 5.4.1 The test equipment (such as pressure environment simulation device, loading system and test system, etc.) should meet the test requirements and be in good working condition. It has the conditions to provide external pressure strength test for metal pressure shell (including pressure shell accessories). 5.4.2 The measuring instruments and meters used in the test should be qualified by metrological verification and within the validity period. Instruments and meters should be calibrated before and after the test Test, and maintain a normal state during the test period. 5.4.3 The measuring instruments and meters used in the test should be installed in a suitable position according to the requirements of the test item and related operating procedures, and pay attention to Moisture-proof, to prevent the external environment and other factors from affecting the test results during the test. 5.4.4 When measuring the test pressure, two pressure gauges with the same range and accuracy should be used, or a pressure sensor can be used to replace one of the pressures. table. The range and accuracy of the pressure gauge should meet the requirements specified in 11.2 of GB/T 150.4-2011.Pressure sensor range and pressure gauge The range requirements are the same, and the accuracy should not be lower than that of the pressure gauge. 5.4.5 When measuring displacement and deformation, an electric displacement sensor or dial indicator can be used, and the range of the displacement sensor should not be less than the measurement range. 2 times, the accuracy should not be less than 0.01mm within 30mm. 5.4.6 During the test, the supply voltage and voltage deviation should meet the voltage input requirements for the normal operation of the test equipment and instruments. 5.5 Test medium The test medium is water. 5.6 Test environment The test environment requirements are as follows. a) The temperature of the test medium is room temperature, that is, 10°C~30°C; for metal pressure-resistant shells with plexiglass observation windows, the test description The quality temperature should be the same as the design temperature of the plexiglass observation window. The requirements of 5.4.1.3 of the Rules for Classification and Construction of Water Apparatus; b) Atmospheric pressure. 84kPa~106kPa; c) Relative humidity requirement. 30%~95%. 5.7 Test pressure The test pressure is established according to the following principles. a) For submersibles with a maximum working depth not greater than 6000m, the test pressure of the metal pressure shell (including pressure shell accessories) is 1.25 times The maximum working pressure of the submersible. b) For submersibles with a maximum working depth greater than 6000m, the test pressure of the metal pressure shell (including pressure shell accessories) is 1.1 times~ 1.25 times the maximum working pressure of the submersible. When designing metal pressure shells (including pressure shell accessories), such as the safety factor and the allowable material The stress used is selected in accordance with the "Code for Classification and Construction of Diving Systems and Submersibles", and the test pressure should be 1.25 times the maximum of the submersible Working pressure, if the safety factor and allowable stress of materials are not selected in accordance with the "Code for Classification and Construction of Diving Systems and Submersibles" The selected material is not within the scope of the "Code for Classification and Construction of Diving Systems and Submersibles", and its test pressure can be determined by itself, but It should not be lower than 1.1 times the maximum working pressure of the submersible. The maximum working pressure of the submersible shall be calculated according to Appendix A.6 Test content and method6.1 Preparation before the test 6.1.1 Before the test, the integrity of the metal pressure shell (including the accessories of the pressure shell) should be checked. The inspection content includes the metal pressure shell and its reinforced structure, Electrical penetrations and auxiliary tooling equipment or components, etc. The metal pressure hull used for the manned cabin should also be checked for the hatch cover and the hatch cover opening and closing mechanism and Observation window and other contents. The fasteners of each connection part should be fully assembled and fastened properly. Temporary pressure element assembled for external pressure test It is necessary to take appropriate measures to ensure its safety. 6.1.2 Before the test, the appearance inspection of the metal pressure shell (including the accessories of the pressure shell) shall be carried out, and the appearance shall be intact, and the surface shall not affect the bearing capacity Scratches, pits and other defects. If there are defects, it should be reassessed whether the external pressure strength test can be carried out. 6.1.3 If conditions permit, a sensor with a water leakage alarm function can be installed at a location where water is easy to store after the metal pressure shell leaks before the test. 6.1.4 The requirements for the sealing test before the test are as follows. a) Before the test, the metal pressure shell (including the pressure shell accessories) should be tested for tightness, and the metal pressure shell (including the pressure shell accessories) should not be sent. Leakage can be detected by hydrostatic external pressure tightness test or air tightness test. After the sealing test is qualified, the outside can be carried out. Compressive strength test. b) In the hydrostatic external pressure sealing test, the detection pressure should not be less than 0.3MPa. It is advisable to mark the area prone to leakage, such as smearing white Powder, etc., in order to determine the specific leakage location. Visually observe the metal pressure shell (including pressure shell accessories) or check the number of water leakage alarms It is judged whether the metal pressure shell (including the pressure shell accessories) leaks. c) Air tightness test detection, the test medium is air, and the test pressure is the design pressure. If the inside of the metal pressure shell is normal pressure, the test The pressure should be no more than 0.1MPa, and the pressure holding time should be no less than 0.5h, which should be enough to leak all welded joints and connections Check whether there is leakage through foaming agents such as soapy water or soaking in water. Use foaming agent to detect, there should be no bubbles on the surface Health; immersion test, there should be no air bubbles on the water surface. d) If the metal pressure shell (including the accessories of the pressure shell) cannot be tested for the overall tightness, the auxiliary test tool can be used to test the metal pressure shell. The tightness of the opening position is tested, and the test medium is water. During the test, the auxiliary test tool is used in the local area of the opening position Establish a closed cavity that can withstand internal pressure, and inject water and pressurize the closed cavity. The test pressure should not be less than 0.3 MPa. The time is not less than 15min, and there should be no leakage at the opening position. e) If leakage occurs, re-test the leak tightness after repair until it is qualified. 6.2 External pressure strength test 6.2.1 General requirements At least two loading and unloading tests shall be carried out for the external pressure strength test. During the test, if required by the test client, strain measurement and displacement or Deformation measurement. If strain measurement and deformation or displacement measurement are not required, the loading and unloading steps of the test shall be in accordance with the test steps of the strain measurement test. carried out. During the test, the metal pressure shell (including pressure shell accessories) shall not produce permanent deformation such as creep during the pressure holding process. 6.2.2 Requirements for loading and unloading The loading speed of the test should not be less than the designed diving speed of the submersible, and the unloading speed should not be less than the designed floating speed of the submersible. Installed The unloading speed of the metal pressure-resistant shell of the machine glass observation window should not be greater than 4.5 MPa/min. During the test, according to Table B.1 in Appendix B, record the pressure value and time at the beginning and end of each stage of the loading and unloading of the test. 6.2.3 Strain measurement 6.2.3.1 General requirements According to the purpose of the test, determine the strain measurement location, uniformly number the corresponding strain, and compile the strain of the metal pressure shell (including the pressure shell accessories) Layout plan of measurement points. 6.2.3.2 Strain measurement location The strain measurement location of the metal pressure shell (including the attachment of the pressure shell) shall be determined by the test client according to the design results, and the following parts should be included. a) Typical parts, that is, the shell plate and reinforced ribs on the typical section of the shell; b) The connection part between the opening reinforced area and the shell; c) The location of local structural stress concentration, such as the opening position of the electrical penetration, can be determined according to the finite element calculation results; d) The location where the construction process factors affect the strength, such as the position of the weld; e) Process defects, such as out-of-tolerance in shape, out-of-tolerance in wall thickness, forced assembly, multiple repair welding, etc.; f) Welded on the shell and used to connect and fix the components; g) Other parts considered by the test client to be measured. 6.2.3.3 Strain gauge pasting requirements When the strain gauge is pasted, follow the requirements below. a) The patch part of the strain gauge should be polished, and the surface of the structure directly under water pressure, the polished area of each measuring point is generally not less than 50mm× 50mm (same requirements for compensating strain gauges), the surface of the structure that is not subject to water pressure, the grinding area of the measuring point is not less than 30mm×30mm (compensation Strain gauge requirements are the same), the surface roughness Ra should not be greater than 3.2μm after polishing, and the strain gauge should be pasted with patch glue. Should Check the quality of the paste after at least 24h after the variants are pasted. 1) There is no obvious deviation between the sticking position of the strain gauge and the marking direction, the strain gauge has no warpage, no degumming, and there is no gap between the strain gauge and the shell surface. bubble; 2) The resistance value of the strain gauge is within ±0.5Ω of the factory nominal value, and the measured value is recorded in Table C.1 of Appendix C; 3) The insulation resistance value of the strain gauge should not be lower than 100MΩ, and the measured value should be recorded in Table C.1. b) After the quality of the strain gauges meets the requirements, weld them with the connecting wires according to their respective numbers, check the resistance value and insulation resistance value, and measure the number The value is entered in Table C.1, and the qualified conditions are in 2) and 3) in a), in which the resistance value should be added with the resistance value of the wire. Connection of all strain gauges The connecting wires should be of the same specification. c) Use vulcanized silicone rubber or other sealant to cover the strain gauges and the welding points of the strain gauges and the wires layer by layer. The coverage area o......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 40073-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 40073-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 40073-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 40073-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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