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GB/T 18442.5-2011 English PDF (GBT18442.5-2011)

GB/T 18442.5-2011 English PDF (GBT18442.5-2011)

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GB/T 18442.5-2011: Static vacuum insulated cryogenic pressure vessel -- Part 5: Inspection and test

This part specifies the basic requirements for the inspection and test of the static vacuum insulated cryogenic pressure vessel. The application scope in this part is the same as that in Part 1 of this standard.
GB/T 18442.5-2011
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 23.020.40
J 76
Partially replacing GB 18442-2001
Static Vacuum Insulated Cryogenic Pressure Vessel -
Part 5. Inspection and Test
ISSUED ON. NOVEMBER 21, 2011
IMPLEMENTED ON. MAY 1, 2012
Jointly issued by. General Administration of Quality Supervision,
Inspection and Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References... 5
3 Terms and Definitions ... 6
4 Test Methods... 6
5 Inspection Rules ... 10
Foreword
"Static Vacuum Insulated Cryogenic Pressure Vessel" (GB/T 18442) comprises 6 parts. - Part 1. General Requirements;
- Part 2. Material;
- Part 3. Design;
- Part 4. Fabrication;
- Part 5. Inspection and Test;
- Part 6. Safety Device Requirements.
This part is the fifth part of GB/T 18442.
This part refers to "Cryogenic Vessels - Static Vacuum-insulated Vessels - Part 1. Design, Fabrication, Inspection and Tests" (ISO 21009-1. 2008) (English Edition). This part replaces "Test Methods" (Chapter 7), "Inspection Rules" (Chapter 8) and partial contents in "Cryo-insulation Pressure Vessels" (GB 18442- 2001). Compared with GB 18442-2001, changes in this part are as follows.
- Test sequence requirements, pressure and tightness test requirements, brief requirements of the cold shock test and brief requirements of safety accessory test were added.
- Relevant inspection and test item requirements were more specified.
This part was proposed by and is under the jurisdiction of the National Technical Committee on Boilers and Pressure Vessels of Standardization Administration of China (SAC/TC 262).
Drafting organizations of this Part. China International Marine Containers (Group) Ltd., Shanghai Gas Industry Association, Zhangjiagang CIMC Sanctum Cryogenic
Equipment Co., Ltd., China Special Equipment Inspection and Research Institute, Shijiazhuang Enric Gas Equipment Co., Ltd., Shanghai Huayi Group Equipment Engineering Co., Ltd. and Shanghai Jiaotong University.
Chief drafting staffs of this part. Tang Jiaxiong, Zhou Weiming, Shou Binan, Zhai Static Vacuum Insulated Cryogenic Pressure Vessel -
Part 5. Inspection and Test
1 Scope
1.1 This part specifies the basic requirements for the inspection and test of the static vacuum insulated cryogenic pressure vessel (hereinafter referred to as "cryogenic vessel").
1.2 The application scope in this part is the same as that in Part 1 of this standard. 2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment) applies. GB 150 Steel Pressure Vessels
GB/T 18442.1 Static Vacuum Insulated Cryogenic Pressure Vessel - Part 1. General Requirements
GB/T 18442.2 Static Vacuum Insulated Cryogenic Pressure Vessel - Part 2. Material GB/T 18442.3 Static Vacuum Insulated Cryogenic Pressure Vessel - Part 3. Design GB/T 18442.4 Static Vacuum Insulated Cryogenic Pressure Vessel - Part 4. Fabrication
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 4.2 Withstand test
4.2.1 The withstand test shall be carried out for the completed vessel according to requirements of the drawing.
4.2.2 Two inspection-qualified pressure gauge with the same measurement range shall be used in the withstand test. Its measurement range shall be 1.5times~3times of the test pressure (2 times is appropriate); its accuracy and dial diameter shall not be less than Grade 1.6 and 100mm respectively.
4.2.3 Hydraulic pressure test
4.2.3.1 Generally, water with chloride ion content no greater than 25 mg/L shall be adopted in the hydraulic pressure test. Where necessary, other liquid unable to cause hazard may also be adopted. During the test, the temperature of the liquid shall be below its flash point or boiling point. And after the test, water stain (or other liquid) shall be cleared off.
4.2.3.2 The temperature for the hydraulic pressure test shall be in accordance with requirements of the drawing.
4.2.3.3 During the liquid filling, gas in the tank shall be exhausted and the external surface of the inner vessel kept dry. During the test, the pressure shall be increased slowly. After reaching the test pressure, it shall be maintained for at least 30 min; then is reduced to the design pressure and maintained at this value long enough for inspection. During the inspection, the pressure shall remain constant, but shall not be maintained by continuous pressurization. In the process of hydraulic pressure test, fastening bolt shall not be pressed or any external force shall not be applied to the pressure parts.
4.2.3.4 As for the hydraulic pressure test, the inner vessel shell complying with the following requirements is regarded as qualified.
a) It is free from leakage and visible deformation as well as abnormal noise in the test;
b) As for the inner vessel shell fabricated from the material with specified value lower limit (Rm) of the tensile strength no less than 540MPa, no crack is found in its surface non-destructive testing at random.
4.2.4 Pneumatic test
4.2.4.1 The tank with residual test liquid shall not be allowed due to the structure, support or medium; and the inner vessel may be adopted according to requirements requirements of the drawing.
4.4.2 During the test, all pipeline and pipe orifices shall be closed except the liquid inlet and exhaust outlet.
4.4.3 During the test, the inner vessel and pipeline shall be fully soaked by liquid nitrogen.
4.4.4 After the cold shock test, its inspection items and requirements shall meet those specified in the drawing.
4.5 Volume determination
4.5.1 Total volume determination, effective volume determination and vacuum interspace volume determination shall be carried out with the inner vessel; and the determination methods are in accordance with those specified in GB/T 18443.8. 4.5.2 The inner vessel with residual test liquid shall not be allowed due to the structure or medium; while the measured volume may be replaced by the volume calculated through geometrical-measured dimension.
4.6 Helium mass spectrum leak detection
4.6.1 Helium mass spectrum leak detection is carried out with the relevant weld and joint according to requirements of the drawing.
4.6.2 After the outer shell and inner vessel are well assembled, generally, the helium mass spectrum leak detection shall be carried out one by one.
4.6.3 In case of any leakage, repairing shall be carried out for a second helium mass spectrum leak detection.
4.7 Vacuum degree measurement
The measurement method of the sealing-off vacuum degree is in accordance with those specified in GB/T 18443.2.
4.8 Leak rate measurement for vacuum insulation layer
The measurement method of the leak rate for vacuum insulation layer is in accordance with those specified in GB/T 18443.3.
4.9 Leak-outgassing rate measurement for vacuum insulation layer
The measurement method of the leak-outgassing rate for vacuum insulation layer is in accordance with those specified in GB/T 18443.4.
4.10 Static evaporation rate measurement
The measurement method of the static evaporation rate is in accordance with those specified in GB/T 18443.5.
4. 11 Holding time measurement
The measurement method of the holding time is in accordance with those specified in GB/T 18443.7.
4.12 Safety accessory test
The safety accessory performance test shall be carried out according to the corresponding standard requirements and the test report be provided with. 4.13 Other test
4.13.1 The appearance quality inspection shall be conducted by visual method. 4.13.2 As for the overall dimensions, at least the outer diameter, total height (length), support layout dimension shall be measured.
5 Inspection Rules
5.1 Inspection classification
The inspection consists of delivery inspection and type test.
5.2 Delivery inspection
5.2.1 One-by-one inspection shall be carried out and only after all the products are qualified, they may be delivered.
5.2.2 The delivery inspection items shall be in accordance with those specified in Table 1.
Table 1 -- Delivery Inspection and Type Test Items
Inspection items Delivery inspection Type test
Overall dimension of the tank ??? ???

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