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GB/T 18442.3-2019: Static vacuum insulated cryogenic pressure vessels - Part 3: Design 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 18442.3: Historical versions
Similar standardsGB/T 18442.3-2019: Static vacuum insulated cryogenic pressure vessels - Part 3: Design---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/GBT18442.3-2019NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.020.40 J 76 Replacing GB/T 18442.3-2011 Static Vacuum Insulated Cryogenic Pressure Vessels - Part 3.Design Issued on. DECEMBER 10, 2019 Implemented on. DECEMBER 10, 2019 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 6 2 Normative References... 6 3 Terms and Definitions... 7 4 General Requirements... 9 5 Design Documents... 9 6 Loads... 11 7 Temperature... 15 8 Pressure... 15 9 Welded Joint Coefficient... 16 10 Allowable Stress... 16 11 Corrosion Allowance... 17 12 Thickness of Tank Body... 17 13 Filling Rate... 18 14 Vacuum Insulation Performance Indicators... 18 15 Vacuum Performance of Annular Space... 21 16 Pressure Resistance Test... 22 17 Leakage Test... 24 18 Structural Design... 24 Appendix A (normative) Risk Assessment Report... 33 Appendix B (informative) Thermodynamic Data of Commonly Seen Refrigerated Liquefied Gases... 351 ScopeThis Part of GB/T 18442 specifies the basic requirements for the design documents, design parameters, performance parameters and structural design of static vacuum insulated cryogenic pressure vessels (hereinafter referred to as “cryogenic vessels”). This Part is applicable to cryogenic vessels that simultaneously satisfy the following conditions. a) The working pressure of the inner vessel is not less than 0.1 MPa; b) The geometric volume is not less than 1 m3; c) The thermal insulation mode is vacuum powder insulation, vacuum composite insulation or high-vacuum multi-layer insulation; This Part does not apply to cryogenic vessels of the following scopes. a) The material of the inner vessel and outer shell is non-ferrous metal or non-metal; b) Spherical structure; c) Stacked thermal insulation mode; d) Mobile; f) The storage medium is toxic gas in accordance with the stipulations of GB 12268; g) There are special requirements for national defense and military equipment.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 150-2011 (all parts) Pressure Vessels GB/T 1448 Fiber-reinforced Plastics Composites - Determination of Compressive Properties GB/T 1450.1 Fiber-reinforced Plastic Composites - Determination of Interlaminar Shear Strength GB/T 9341 Plastics - Determination of Flexural Properties GB/T 18442.1 Static Vacuum Insulated Cryogenic Pressure Vessels - Part 1.General Requirements GB/T 20801.3-2006 Pressure Piping Code - Industrial Piping - Part 3.Design and Calculation GB/T 20801.5 Pressure Piping Code - Industrial Piping - Part 5.Inspection and Testing GB/T 24511 Stainless Steel and Heat Resisting Steel Plate, Sheet and Strip for Pressure Equipment3 Terms and DefinitionsWhat is defined in GB/T 150, GB/T 18442.1 and GB/T 26929, and the following terms and definitions are applicable to this document. 3.1 Effective Volume Effective volume refers to the maximum liquid volume of the refrigerated liquefied gas allowed to be filled in the cryogenic vessel in the state of use. 3.2 Filling Rate Filling rate refers to the ratio of the liquid volume of the refrigerated liquefied gas filled in the cryogenic vessel to the geometric volume of the inner vessel. 3.3 Specified Filling Rate Specified filling rate refers to the ratio of the liquid volume when the filled liquid reaches the highest liquid level specified in the design to the geometric volume of the inner vessel when the cryogenic vessel is filled. 3.4 Holding Time Holding time refers to the time it takes for the inner vessel to rise from the ambient atmospheric pressure to the set pressure of the safety relief device when filling refrigerated liquefied gas in accordance with the specified filling rate, after the refrigerated liquefied gas standing still inside reaches thermal equilibrium with the external ambient temperature under the atmospheric pressure, the liquid is filled to the specified filling rate, and after the gas phase valve is closed. 3.5 Static Evaporation Rate Static evaporation rate refers to the percentage of the mass of the refrigerated liquefied gas lost by natural evaporation within 24 h after the cryogenic vessel stands still to achieve thermal equilibrium at the specified filling rate, to the mass of the refrigerated liquefied gas under the effective volume of the inner vessel.4 General Requirements4.1 In addition to the requirements of this Part, the design of cryogenic vessels shall also comply with the stipulations of TSG 21 and GB/T 150.3. 4.2 The design organization shall rigorously follow the design conditions of the cryogenic vessels provided by the design entrusting party, and comprehensively consider all relevant factors, failure modes and sufficient safety margins, so as to ensure that the cryogenic vessels have sufficient strength, stiffness, stability and corrosion resistance. 4.3 The layout of the tank body, piping, safety accessories, instruments, and loading and unloading accessories shall satisfy the requirements for application and safety. 4.4 The basic content of the risk assessment report shall comply with the stipulations of Appendix A.5 Design Documents5.1 The design documents of the cryogenic vessels shall at least include the following items. a) Risk assessment report, including the main failure modes and risk control in the stages of design, manufacture and application, etc.; b) Design specification, including the main physical and chemical properties of the filling medium (serial No., name, category, and saturated vapor pressure and density corresponding to the working temperature, etc.), hazardous characteristics, limited components of mixed media and limited content requirements of detrimental impurities, as well as compatibility with tank body materials, etc. In addition, the selection of design specifications and standards, the determination principles of main design structures, the determination principles of main design parameters, the selection of materials, the selection of safety accessories, the selection of instruments, and loading and unloading accessories, and the selection of self-pressure boosters shall be elaborated; 5.2 The general design drawing shall at least indicate the following contents. 5.3 The piping system drawing shall at least indicate the following contents. a) The standards, on which, the design and manufacture of the piping system are based; b) Design parameters, including design temperature, design pressure and welded joint coefficient, etc.; c) Material designation and material standard No. and specifications of the stress- bearing elements of the piping; d) Models, specifications, performance parameters, connection modes and nozzle orientations of safety accessories (including piping overpressure relief device), instruments, and loading and unloading accessories, etc.; e) Requirements for non-destructive testing; f) Requirements for pressure resistance test; g) Requirements for leakage test.6 Loads6.1 Overall Requirements The cryogenic vessels shall be able to withstand mechanical loads (including pressure load, gravity load, inertial force load and dynamic load) and thermal stress loads under various possible working conditions, such as. normal operation and empty tank transportation, etc. In addition, the most demanding combination of these loads that may occur shall also be considered. Meanwhile, structural fatigue failures due to pressure fluctuations of the inner vessels within the design service life shall be considered. 6.2 Design Load of Inner Vessel 6.2.1 The following loads shall be considered for the pressure load. 6.2.2 The following loads shall be considered for the gravity load. 6.2.3 The loads caused by the following items shall be considered for the dynamic load. 6.2.4 The thermal stress load shall at least take into account the uneven strain load caused by the temperature gradient and the piping reaction force caused by the thermal expansion or cold contraction of the inner vessel and the annular space piping under the following working conditions. 6.2.5 During the empty tank transportation, the inertial force load borne by the annular space support structure shall be converted to an equivalent static force in accordance with the following requirements; the maximum mass shall be the sum of the masses of the inner vessel and its accessories; 6.3 Design Load of Outer Shell 6.3.1 The loads caused by internal or external pressure shall be considered for the pressure load. 6.3.2 The gravity load shall consider the gravity load (the self-weight of the tank body and accessories, such as. external piping, escalators and platforms, etc.) borne by the tank body support under normal working conditions, as well as the gravity load of the medium contained in the inner vessel under normal working conditions or test conditions. The support reaction force borne by the outer shell at the support connection is equal to the gravity load borne by the support. 6.3.3 The thermal stress load shall consider the load applied to the outer shell by the annular space piping under the working conditions of 6.2.4 b) and c). 6.3.4 The inertial force load shall at least consider the load applied to the outer shell by the transport support or lifting lug under the following conditions a) and b). 6.4 Exemption Criteria for Fatigue Analysis 6.4.1 When all the requirements of 6.4.2, 6.4.3 or 6.4.4 are satisfied, the fatigue analysis may be exempted. Otherwise, the inner vessel shall be designed for fatigue analysis in accordance with JB 4732. 6.4.2 For the inner vessels with number of cycles 106, if the designed cryogenic vessel has comparable shape and load conditions to the cryogenic vessels with successful experience in application, and has been operated for sufficient time and approved by service experience, it can be exempted from the fatigue analysis. However, special attention shall be paid to the adverse effects of the following situations. 6.4.3 When the inner vessel is made of austenitic stainless steel, the sum of the following various cycles does not exceed 4,000 times. 6.4.4 Satisfy the corresponding fatigue analysis exemption conditions specified in JB 4732.7 Temperature7.1 Design Temperature 7.1.1 The design temperature of the inner vessel shall not be lower than the possible maximum working temperature of the metal of the elements under normal working conditions. 7.1.2 The design temperature of the outer shell shall consider the influence of ambient temperature and service conditions, and shall not be lower than 50 C. 7.2 Minimum Design Metal Temperature 7.2.1 The minimum design metal temperature of the inner vessel shall consider the influence of the minimum working temperature of the medium on the metal temperature of the inner vessel under normal working conditions, and under inspection and test conditions, and shall not be higher than the boiling point of the medium.8 Pressure8.1 Design Pressure 8.1.1 The design pressure of the inner vessel shall be determined in accordance with the following requirements. 8.1.2 The design pressure of the outer shell shall be determined in accordance with the following requirements. 8.2 Calculated Pressure 8.2.1 The calculated pressure of the stress-bearing elements of the inner vessel shall not be less than the sum of the design pressure, the static pressure of the liquid column and 0.1 MPa. 8.2.2 When the static pressure of the liquid column is less than 5% of the design pressure, it can be ignored.9 Welded Joint Coefficient9.1 The welded joint coefficient of the inner vessel shall take 1.0. 9.2 The welded joint coefficient of the outer shell shall take 0.85. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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