This part of GB/T 18443 specifies the testing principle and method, testing device, equipment and instrument, testing conditions and preparation, procedure, data processing, testing record and testing report requirements for the heat-leak rate measurement of vacuum insulation cryogenic equipment.
This part is applicable to the heat-leak rate measurement of vacuum insulation cryogenic pressure vessels, vacuum insulation cryogenic welded gas cylinders, vacuum insulation pipes and pipe fittings and other vacuum insulation cryogenic equipment except storage and transportation of liquid hydrogen medium; other equipment may refer to the provisions of this part.
Flowmeter measurement is applicable to the heat-leak rate measurement of vacuum insulation cryogenic pressure vessels, vacuum insulation cryogenic welded gas cylinders and other vacuum insulation cryogenic equipment; surface temperature measurement is applicable to the heat-leak rate measurement of vacuum insulation pipes and pipe fittings.
2 Normative References
The following normative documents contain provisions which, through reference in this 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 18443.1-2010 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 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 18443.5-2010 Testing Method of Performance for Vacuum Insulation Cryogenic Equipment - Part 5: Static Vaporation Rate Measurement
3 Terms and Definitions
For the purposes of this part, the terms and definitions given in GB/T 18443.1~GB/T 18443.5 and the following apply.
3.1
heat-leak rate
the heat quantity transmitted from the surrounding environment to storage media of vacuum insulation cryogenic equipment in unit time, W
