GB/T 18442.5-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 18442.5-2019 | English | 145 |
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Static vacuum insulated cryogenic pressure vessels - Part 5: Inspection and testing
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| GB/T 18442.5-2011 | English | 70 |
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Static vacuum insulated cryogenic pressure vessel -- Part 5: Inspection and test
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GB/T 18442.5-2019: Static vacuum insulated cryogenic pressure vessels - Part 5: Inspection and testing
---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/GBT18442.5-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.40
J 76
Replacing GB/T 18442.5-2011
Static vacuum insulated cryogenic pressure vessels -
Part 5.Inspection and testing
Issued on. DECEMBER 31, 2019
Implemented on. DECEMBER 31, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 7
4 Test methods... 7
5 Inspection rules... 12
1 Scope
This Part of GB/T 18442 specifies the test methods and inspection rules during
and after the fabrication of static vacuum insulated cryogenic pressure vessels
(hereinafter referred to as "cryogenic vessels").
This Part applies to cryogenic vessels, which simultaneously meet the following
conditions.
a) The working pressure of the inner vessel is not less than 0.1 MPa;
b) The geometric volume is not less than 1 m3;
c) The insulation method is vacuum powder insulation, vacuum composite
insulation, or high vacuum multilayer insulation;
d) The storage medium is a refrigerated liquefied gas with a standard boiling
point of not lower than -196 °C.
This Part does not apply to cryogenic vessels in the following scope.
a) The material of inner vessel and outer jacket is non-ferrous metal or non-
metal;
b) HAVE a spherical structure;
c) Stacked insulation;
d) Mobile;
e) STORE refrigerated liquefied gas medium with standard boiling point
below -196 °C;
f) The storage medium is toxic gas according to GB 12268;
g) Those with special requirements such as national defense and military
equipment.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 150 (all parts) Pressure vessels
GB/T 18442.1 Static vacuum insulated cryogenic pressure vessels - Part 1.
General requirements
GB/T 18442.2-2019 Static vacuum insulated cryogenic pressure vessels -
Part 2.Materials
GB/T 18442.3-2019 Static vacuum insulated cryogenic pressure vessels -
Part 3.Design
GB/T 18442.4-2019 Static vacuum insulated cryogenic pressure vessels -
Part 4.Fabrication
GB/T 18442.6-2019 Static vacuum insulated cryogenic pressure vessel -
Part 6.Safety device requirements
GB/T 18443.2 Testing method of performance for vacuum insulation
cryogenic equipment - Part 2.Vacuum degree measurement
3 Terms and definitions
The terms and definitions defined in GB/T 150, GB/T 18442.1, GB/T 18442.3,
and GB/T 18442.4 and the following ones apply to this document.
4 Test methods
4.1 Test sequence
4.1.1 When the cold shock test is required, it shall be carried out after the inner
vessel has been manufactured and the nondestructive testing is passed.
4.1.4 The pressure-tight test of the external piping shall be carried out after the
tank and external piping have been manufactured and the nondestructive
testing is passed.
4.1.5 The leak test shall be carried out after the tank and piping system have
been assembled, and after all safety accessories, instruments, and loading-
unloading accessories have been installed.
4.2 Pressure-tight test
4.2.1 Pressure-tight test of inner vessel
4.2.1.1 Basic requirements for pressure-tight test
4.2.1.2.3 The hydraulic test shall meet the following requirements.
4.2.1.2.4 During the hydraulic test, if the inner vessel has no leak, no visible
deformation, and abnormal noise, it is qualified.
4.2.1.3 Air pressure test
4.2.1.3.1 For inner vessels that do not allow residual test liquid due to structure
or support, medium, etc., the air pressure test is generally used.
4.2.1.3.2 The gas used in the test shall be dry and clean air, nitrogen, or other
inert gas.
4.2.1.3.6 During the air pressure test, if there is no abnormal noise in the inner
vessel, and there are no air leak and no visible deformation checked through
liquid soap or other reliable leak detection methods, it is qualified.
4.2.2 Pressure-tight test of piping
4.2.2.1 The internal piping of the annular space and the inner vessel are
subjected to a pressure-tight test together. After the external piping passes the
nondestructive testing, the pressure-tight test shall be carried out according to
the drawing.
4.2.2.2 Pressure-tight test requirements and test procedures of piping are in
accordance with the provisions of GB/T 20801.5; and, meet the requirements
of drawings.
4.3 Air tightness test
4.3.1 After the pressure-tight test is passed, all safety accessories, instruments,
loading-unloading accessories shall be installed and subjected to the air
tightness test.
4.4 Helium leak detection test
The helium leak detection test shall meet the requirements of GB/T 18443.3 or
design documents.
4.5 Cold shock test
4.5.1 Whether to do the cold shock test shall be based on the requirements of
the drawing.
4.5.2 Liquid nitrogen shall be used as the test medium for the cold shock test.
4.6 Cleanliness detection
4.6.1 The cleanliness testing method of the surface of the parts in contact with
the medium is in accordance with the provisions of JB/T 6896.
4.6.2 The testing methods for degreasing, descaling, drying, etc. on the surface
of the vacuum annular space and the surfaces of its internal parts are in
accordance with the design documents.
4.7 Volume measurement
4.9 Detection of air leak rate of vacuum annular space
The detection method of the air leak rate of vacuum annular space is in
accordance with the provisions of GB/T 18443.3.
4.10 Detection of leak-outgassing rate of vacuum annular space
The detection method of the leak-outgassing rate of vacuum annular space is
in accordance with the provisions of GB/T 18443.4.
4.11 Detection of static evaporation rate
The detection method of static evaporation rate is in accordance with GB/T
18443.5.
4.12 Detection of holding time
The detection method of holding time is in accordance with the provisions of
GB/T 18443.7.
4.13 Test of safety accessories
The performance test of safety accessories shall comply with the provisions of
the corresponding product standards and design documents.
4.14 Other inspections
4.14.1 The inspection items after the final assembly of cryogenic vessel include
at least the following contents. The conformity requirements shall meet the
requirements of this Part and the design documents.
5 Inspection rules
5.1 Inspection classification
The inspection is classified into one-by-one inspection, lot size inspection, and
type test.
5.2 One-by-one inspection
After the cryogenic vessel is completed, it shall pass the inspection one by one
before leaving the factory. The one-by-one inspection items and requirements
shall be in accordance with Table 1 and Table 2.
5.3 Lot size inspection
5.4 Type test
5.4.1 Cryogenic vessels shall be subjected to low-temperature performance
type tests. The low-temperature performance type tests shall be carried out by
a type test agency approved by the relevant national competent authority. A
low-temperature performance type test report and certificate shall be issued.
5.4.2 In one of the following situations, it shall carry out a low-temperature
performance type test.
5.4.3 The test items, requirements, and test vessel selection rules for the low-
temperature performance type test shall be in accordance with Table 1, Table
2, and Table 3, respectively.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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