Standard No.:	GB/T 18443.7-2010
English Name:	Testing method of performance for vacuum insulation cryogenic equipment—Part 7:Holding time measurement
Chinese Name:	真空绝热深冷设备性能试验方法 第7部分：维持时间测量
Chinese Classification:	J74    Pressure vessel
Professional Classification:	GB    National Standard
Issued by:	AQSIQ; SAC
Issued on:	2010-9-26
Implemented on:	2011-2-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	170.0
Delivery:	via email in 1 business day

Scope 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 3.2 tested holding time

Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 Testing Principles and Methods 5 Testing Devices, Apparatus and Instruments 6 Testing Conditions and Preparation 7 Testing Procedure 8 Data Processing 9 Testing Record and Testing Report Annex A (Informative) Calculation for Holding Time of Standard Condition Based on the Test Result of Static Vaporation Rate Annex B (Informative) Holding Time Testing Record Annex C (Informative) Holding Time Testing Report