GB/T 18442.3-2019 PDF English (GB/T 18442.3-2011: Older version)

GB/T18442.3-2019 (GBT18442.3-2019): PDF in English

GB/T 18442.3-2019 NATIONAL 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 Contents Foreword ... 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 ... 35  Static Vacuum Insulated Cryogenic Pressure Vessels - Part 3: Design 1 Scope This 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; d) The storage medium is refrigerated liquefied gas with the standard boiling point not lower than 196 C. 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; e) Store refrigerated liquefied gas medium with the standard boiling point not lower than 196 C; 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 References The 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. 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. It is converted into the time at the standard atmospheric pressure (1.01325  105 Pa) and the set ambient temperature (20 C). NOTE: it is expressed in (h). 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. It is converted into the evaporation rate at the standard atmospheric pressure (1.01325  105 Pa) and the set ambient temperature (20 C). 3.6 Annular Space Vacuum Degree Annular space vacuum degree refers to the absolute pressure of gas in the annular space in the cryogenic vessel. 3.7 Sealing-off Vacuum Degree Sealing-off vacuum degree refers to the vacuum degree when the vacuum annular space pressure is relatively stable at room temperature after the vacuuming of the tank annular space is completed and the vacuuming interface is sealed off. 3.8 Leakage Rate of Vacuum Annular Space Leakage rate of vacuum annular space refers to the amount of gas leaking into the vacuum annular space per unit time. 3.9 Outgassing Rate of Vacuum Annular Space Outgassing rate of vacuum annular space refers to the amount of gas released per unit time from the material in the vacuum annular space and the surface of the vessel wall, etc. 3.10 Outgassing and Leakage Rate of Vacuum Annular Space Outgassing and leakage rate of vacuum annular space refers to the sum of the leakage rate of vacuum annular space and the outgassing rate of vacuum annular space. 4 General Requirements 4.1 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. Meanwhile, the strength requirements for the welded joints between the main load-bearing components, such as: annular space supports, supports and lifting lugs of the cryogenic vessels, and the tank body shall also be considered, so as to ensure the safety of the cryogenic vessels within the design service life. 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. The thermodynamic data of commonly-seen refrigerated liquefied gas is shown in Appendix B. 5 Design Documents 5.1 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; h) Design service life of the cryogenic vessels; i) Requirements for pressure resistance test and leakage test; j) Manufacturing requirements, including requirements for non-destructive testing, heat treatment (if necessary), surface cleaning, nitrogen or inert gas replacement, as well as outer shell surface treatment and coating, etc.; k) Tank body insulation mode, vacuum insulation performance indicators and annular space vacuum performance indicators, etc.; l) Specifications, performance parameters and connection modes of tank safety accessories, instruments, and loading and unloading accessories; m) Orientation, specifications and connection flange standards of nozzles, etc.; n) Location of product nameplate; o) Requirements for packaging, transportation and installation. 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 Loads 6.1 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: a) Internal pressure, external pressure or maximum differential pressure; b) When the storage volume reaches the specified filling rate, the static pres.......
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