This part of GB/T 18443 specifies testing principles and methods, testing devices, apparatus and instruments, testing conditions and preparation, testing procedure, data processing, testing record and testing report for the holding time measurement of vacuum insulation cryogenic equipment.
This part is applicable to the holding time measurement of vacuum insulation cryogenic equipment such as vacuum insulation cryogenic pressure vessels and vacuum insulation cryogenic welded gas cylinders, excluding those for storage and transport of liquid hydrogen medium.
2 Normative References
The following normative documents contain provisions which, through reference in the text, constitute provisions of this part of GB/T 18443. For dated references, subsequent amendments (excluding corrections), or revisions of, any of these publications do not apply to this part. However parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 18443.1 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 Measurement
GB/T 18443.3 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 3: Leak Rate Measurement
GB/T 18443.4 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 4: Leak-outgassing Rate Measurement
GB/T 18443.5 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 5: Static Vaporation Rate Measurement
GB/T 18443.6 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 6: Heat-leak Rate Measurement
GB/T 18443.8 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 8: Volume Measurement
3 Terms and Definitions
For the purposes of this part, the terms and definitions given in GB/T 18443.1~GB/T 18443.6 and the following apply.
3.1
closed system
a system in the vacuum insulation cryogenic equipment, in which the mass of the medium remains unchanged without medium input or output during the test
