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GB/T 18443.2-2010 PDF English

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GB/T 18443.2-2010: Testing method of performance for vacuum insulation cryogenic equipment - Part 2: Vacuum degree measurement
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GB/T 18443.2: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 18443.2-201070 Add to Cart Auto, 9 seconds. Testing method of performance for vacuum insulation cryogenic equipment - Part 2: Vacuum degree measurement Valid
GB/T 18443.2-2001239 Add to Cart 2 days Testing method of cryo-insulation pressure vessels -- Vacuum measurement Obsolete

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GB/T 18443.3   GB/T 18443.1   GB/T 18443.4   GB/T 18443.7   

GB/T 18443.2-2010: Testing method of performance for vacuum insulation cryogenic equipment - Part 2: Vacuum degree 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/GBT18443.2-2010
NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 23.020 J 74 Replacing GB/T 18443.2-2001, GB/T 16876-1997 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 2.Vacuum Degree 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 Contents

Foreword... 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... 7 6 Test Conditions and Preparation... 7 7 Test Procedures... 8 8 Data Processing... 9 9 Test Records and Reports... 10 Appendix A (informative) Test Records of Interspace Vacuum Degree of Normal Atmospheric Temperature or Interspace Vacuum Degree after Loaded... 11 Appendix B (informative) Test Reports of Interspace Vacuum Degree of Normal Atmospheric Temperature or Interspace Vacuum Degree after Loaded... 12

Foreword

GB/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 2 of GB/T 18443. This Part serves as a replacement of GB/T 18443.2-2001 Testing Method of Cryo-insulation Pressure Vessels - Vacuum Measurement and GB/T 16876-1997 Test Methods for Interspace Vacuum of Liquid Nitrogen Containers. In comparison with GB/T 18443.2-2001, the main changes are as follows. ---The scope of application is extended from the vacuum degree measurement of the interspace of low-temperature heat insulated pressure vessels to the vacuum degree 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, etc. ---Terms and definitions are added. ---The content of GB/T 16876-1997 is integrated into this Part. 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; Shanghai Jiao Tong University; Sichuan Air Separation Plant Group; National Cryogenic Vessel Quality Supervision and Inspection Center (Guangdong); Shanghai Huayi Group Equipment Engineering Co., Ltd.; China Special Equipment Inspection & Research Institute. The main drafters of this Part. Luo Xiaoming, Zhou Weiming, Yi Xilang, Chen Guangqi, Shu Wenhua, Shou Binan, Xue Jiai, Gu Fuming, Wang Rongshun, Xue Xiaolong, Shi Fengping, Wei Yongbiao, Wang Weiguo. The issuing of the previous versions. ---GB/T 18443.2-2001; ---GB/T 16876-1997. Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 2.Vacuum Degree Measurement

1 Scope

This 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 vacuum degree measurement of the interspace of vacuum insulated cryogenic equipment. This Part is applicable to the vacuum degree measurement of the interspace 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 References

The 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

3 Terms and Definitions

What is established in GB/T 18443.1, and the following terms and definitions are applicable to this Part. 3.1 Interspaced Vacuum Degree Interspaced vacuum degree refers to the absolute pressure (expressed in Pa) of the gas in the interlayer space of the vacuum insulated cryogenic equipment. 3.4 Interspace Vacuum Degree of Normal Atmospheric Temperature Interspace vacuum degree of normal atmospheric temperature refers to the static interspace vacuum degree (expressed in Pa) when no cryogenic liquid is injected into the vacuum insulated cryogenic equipment, and the inner tank and outer shell are both at atmospheric temperature. 3.5 Interspace Vacuum Degree after Loaded Interspace vacuum degree after loaded refers to the static interspace vacuum degree (expressed in Pa) when the vacuum insulated cryogenic equipment has been injected with cryogenic liquid and is under the thermal equilibrium state.

4 Test Principles and Methods

4.1 The measurement of the interspace vacuum degree is divided into direct measurement method and indirect measurement method. The schematic diagram of the test device of the direct measurement method is shown in Figure 1; 4.2 The direct measurement method refers to the direct measurement of the vacuum degree of the interspace by using the vacuum gauge installed on the measured piece.

5 Test Devices, Equipment and Instruments

The test devices, equipment and instruments shall comply with the stipulations of 4.2 in GB/T 18443.1-2010.

6 Test Conditions and Preparation

6.1 The basic requirements of the test shall comply with the stipulations of GB/T 18443.1. 6.2 During the measurement of the interspace vacuum degree of normal atmospheric temperature, the inner container and outer shell of the measured piece shall be at the atmospheric temperature. 6.4 The vacuum gauge on the measurement pipeline shall be vertically placed. The opening plane of the vacuum gauge shall be parallel to the direction of airflow, and the vacuum gauge shall not be “degassed” within 15 min before the test. 6.5 When adopting flammable cryogenic liquid as the test medium, safety inspection shall be carried out before filling.

7 Test Procedures

7.1 Direct Measurement Method 7.2 Indirect Measurement Method 7.2.1 Connect the measured piece and the vacuum measurement system in accordance with Figure 2. 7.2.2 When the vacuum valve of the measured piece and the vacuum valve of the pumping system are closed, start the vacuum unit. 7.2.3 Open the vacuum valve of the pumping system. Use the low vacuum pump to pump the pressure of the measurement pipeline to below 3 Pa, then, use the high vacuum pump to pump it. When the measurement pipeline receives air pumping, heating degassing is allowed. 7.2.7 After 2 min of observation, after the pressure between the interlayer space and the measurement pipeline space is balanced, record the vacuum degree P1 of the connected space after it becomes stable.

8 Data Processing

8.1 During the measurement of interspace vacuum degree of normal atmospheric temperature through the indirect measurement method, calculate in accordance with Formula (1). 8.2 During the measurement of interspace vacuum degree after loaded through the indirect measurement method, calculate in accordance with the following formulas.

9 Test Records and Reports

9.1 The format of test records is shown in Appendix A. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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