GB/T 18443.3-2010 PDF EnglishUS$85.00 · In stock · Download in 9 seconds
GB/T 18443.3-2010: Testing method of performance for vacuum insulation cryogenic equipment - Part 3: Leak rate measurement 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 18443.3: Historical versions
Similar standardsGB/T 18443.3-2010: Testing method of performance for vacuum insulation cryogenic equipment - Part 3: Leak rate measurement---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/GBT18443.3-2010 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.020 J 74 Replacing GB/T 18443.3-2001, GB/T 16775-1997 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 3.Leak Rate Measurement Issued on. SEPTEMBER 26, 2010 Implemented on. FEBRUARY 1, 2011 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 5 4 Test Principles and Methods... 6 5 Test Devices, Equipment and Instruments... 8 6 Test Conditions and Preparation... 8 7 Test Procedures... 9 8 Data Processing... 12 9 Test Records and Reports... 13 Appendix A (informative) Test Records of Leak Rate... 14 Appendix B (informative) Test Reports of Leak Rate... 16ForewordGB/T 18443 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment is divided into eight parts. ---Part 1.Basic Requirements; ---Part 2.Vacuum Degree Measurement; ---Part 3.Leak Rate Measurement; ---Part 4.Leak-outgassing Rate Measurement; ---Part 5.Static Evaporation Rate Measurement; ---Part 6.Heat-leak Rate Measurement; ---Part 7.Holding Time Measurement; ---Part 8.Volume Measurement. This is Part 3 of GB/T 18443. This Part serves as a replacement of GB/T 18443.3-2001 Testing Method of Cryo-insulation Pressure Vessels - Leakage Measurement and GB/T 16775-1997 Test Methods for Leak Rate of Cryogenic Containers. In comparison with GB/T 18443.3-2001, the main changes are as follows. ---The scope of application is extended from the leak rate measurement of low-temperature heat insulated pressure vessels to the leak rate measurement of vacuum insulated cryogenic equipment, such as. vacuum insulated cryogenic pressure vessels, vacuum insulated cryogenic welding gas cylinders and vacuum insulated cryogenic pipes and their pipe fittings, etc. ---Terms and definitions are added. ---The test method is modified from the previous “dynamic leak detection method and cumulative leak detection method” into “helium hood leak detection method and helium hood leak detection method by-passing”; ---The re-detection requirements for the effective minimum detectable leak rate are added; ---The requirements for the format of test records are added. Appendix A and Appendix B of this Part are informative. This Part was proposed by and shall be under the jurisdiction of National Technical Committee 262 on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262). The drafting organizations of this Part. Shanghai Institute of Special Equipment Inspection and Technical Research; Shanghai Gas Industry Association; National Cryogenic Vessel Quality Supervision and Inspection Center; Shanghai Jiao Tong University; Shanghai Huayi Group Equipment Engineering Co., Ltd.; China Special Equipment Inspection & Research Institute. The main drafters of this Part. Chen Guangqi, Zhou Weiming, Lu Xuesheng, Shu Wenhua, Shou Binan, Luo Xiaoming, Xue Jiai, Wang Rongshun, Xue Xiaolong, Shi Fengping, Wei Yongbiao, Gu Fuming, Wang Weiguo. The issuing of the previous versions. ---GB/T 18443.3-2001; ---GB/T 16775-1997. Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 3.Leak Rate Measurement1 ScopeThis Part of GB/T 18443 specifies the test principles and methods, test devices, equipment and instruments, test conditions and preparation, test procedures, data processing, test records and test reports of the leak rate measurement of vacuum insulated cryogenic equipment. This Part is applicable to the leak rate measurement of vacuum insulated cryogenic equipment, such as. vacuum insulated cryogenic pressure vessels, vacuum insulated cryogenic welding gas cylinders and vacuum insulated pipes and their pipe fittings, except for liquid hydrogen storage and transportation media. The other equipment may take this as a reference.2 Normative ReferencesThe clauses of the following documents become clauses of this Part through the reference in this Part of GB/T 18443.In terms of references with a specified date, all subsequent amendments (excluding errata content) or revisions do not apply to this Part. However, the various parties that reach an agreement in accordance with this Part are encouraged to explore whether the latest versions of these documents are applicable. In terms of references without a date, the latest versions apply to this Part. GB/T 18443.1-2010 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 1.Basic Requirements GB/T 18443.2 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 2.Vacuum Degree Measurement3 Terms and DefinitionsWhat is established in GB/T 18443.1-2010 and GB/T 18443.2, and the following terms and definitions are applicable to this Part. 3.1 Leak Rate Leak rate refers to the flow rate of a specific gas passing through a leak under specified conditions, expressed in (Pa m3/s). 3.2 Effective Systematic Minimum Detectable Leak Rate Effective systematic minimum detectable leak rate refers to the minimum leak rate that can be detected by the instrument for the measured piece under specific working conditions, methods and systems of leak detection, expressed in (Pa m3/s). 3.3 Reference Leak Standard Leak Reference leak / standard leak refers to a device for calibration that provides a known flow rate of a specified gas under specified conditions (temperature and pressure).4 Test Principles and Methods4.1 Leak Detection System The schematic diagram of the test device of the helium hood leak detection system is shown in Figure 1. 4.2 Test Principles 4.2.1 Basic principle A closed gas hood covers the measured area outside the measured piece. After the closed space inside the measured piece is evacuated to a vacuum degree that can ensure the stable operation of the helium mass spectrometer in the required sensitivity range, use helium gas to fill the hood. When there is a leak in the measured piece, helium gas enters the system through the leak and is sucked into the leak detector, which displays a helium signal. By comparing it with the helium signal triggered by the standard leak, calculate the leak rate of the measured piece.5 Test Devices, Equipment and InstrumentsThe test devices, equipment and instruments shall comply with the stipulations of 4.2 in GB/T 18443.1, and satisfy the following requirements.6 Test Conditions and Preparation6.1 The basic test requirements shall comply with the stipulations of GB/T 18443.1 and satisfy the following requirements. 6.2 Selection of Test Methods 6.2.1 When the gas load of the measured piece satisfies the pumping capacity of the leak detector, the helium hood leak detection method shall be selected for the measurement.7 Test Procedures7.1 Helium Hood Leak Detection Method 7.1.1 The measurement of the effective minimum detectable leak rate of the instrument shall comply with the following requirements. 7.1.2 The connection of the measured piece shall comply with the following requirements. 7.1.3 The measurement of the effective systematic minimum detectable leak rate shall comply with the following requirements. 7.1.4 The leak detection by the measured piece shall comply with the following requirements. 7.1.5 The re-detection of the effective systematic minimum detectable leak rate shall comply with the following requirements. 7.2 Helium Hood Leak Detection Method By-passing 7.2.1 The measurement of minimum detectable leak rate The measurement of the effective minimum detectable leak rate of the instrument shall be carried out in accordance with the requirements of 7.1.1. 7.2.3 The measurement of the effective systematic minimum detectable leak rate shall comply with the following requirements. 7.2.4 The leak detection of the measured piece shall comply with the following requirements. 7.2.5 The re-detection of the effective systematic minimum detectable leak rate shall comply with the following requirements.8 Data Processing8.1 The effective minimum detectable leak rate of the instrument shall be calculated in accordance with Formula (1). 8.3 The leak rate of the measured piece shall be calculated in accordance with Formula (3).9 Test Records and Reports9.1 The format of test records is shown in Appendix A.Appendix A(informative) Test Records of Leak Rate The format of the test records of leak rate is shown in Table A.1. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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