GB/T 31480-2015 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 31480-2015 | English | 315 |
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Materials for high vacuum multilayer insulation of cryogenic vessel
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GB/T 31480-2015: Materials for high vacuum multilayer insulation of cryogenic vessel---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/GBT31480-2015
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.020.40
A 82
Materials for high vacuum multilayer insulation of
cryogenic vessel
Issued on. MAY 15, 2015
Implemented on. SEPTEMBER 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Product types and models... 6
5 Raw materials... 9
6 Technical requirements... 12
7 Test methods... 14
8 Inspection rules... 15
9 Sign, product exit-factory information... 16
10 Packaging, transport, storage... 17
Appendix A (Normative) Test method for apparent thermal conductivity... 18
Appendix B (Normative) Test method of outgassing rate... 26
1 Scope
This standard specifies the product types and models, raw materials, technical
requirements, test methods, inspection rules, markings, product exit-factory
information, packaging, transportation, storage requirements of materials for high
vacuum multilayer insulation of cryogenic vessel.
This standard is applicable to the thermal insulation material, which is alternately
combined with spacing materials and heat-resistant radiation shields for high vacuum
multilayer insulation of cryogenic vessel.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 451.1 Paper and board - Determination of size and deviation
GB/T 451.2 Paper and board - Determination of size and deviation
GB/T 451.3 Paper and board - Determination of grammage
GB/T 3198 Aluminium and aluminium-alloy foil
GB/T 9914.2 Test method for reinforcement products - Part 2.Determination of
combustible - Matter content for glass fiber
GB/T 12914 Paper and board - Determination of tensile properties
GB/T 14014 Synthetic fiber bolting cloths
GB/T 15717 Test method for vacuum-deposited metal thickness - Electric resistance
method
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
High vacuum multilayer insulation
In the high vacuum multilayer insulation space of cryogenic vessel, the thermal
insulation method, which is formed by the alternate combination of spacing
materials and heat-resistant radiation shields.
3.2
Heat-resistant radiation shield
Metal foil, which has high reflectivity, OR film, which has metal plating.
3.3
Spacing material
The thermal-insulating material, which is used between heat-resistant radiation
shields, to prevent direct contact between two adjacent heat-resistant radiation
shields.
3.4
Apparent thermal conductivity
Under specified test conditions, the heat transferred per unit time, through a
multilayer insulation unit thickness of insulating material.
3.5
Outgassing rate
Under the specified test conditions, the amount of gas released per unit mass of
material, per unit time.
4 Product types and models
4.1 Multilayer insulation unit
4.1.1 Structure
A typical structure of the multilayer insulation unit is as shown in Figure 1.
Legends.
4.2 Multilayer insulation rolls
4.2.1 Product structure
A typical structure of a multilayer insulation roll is as shown in Figure 2.
Legends.
4.3 Multilayer insulation blanket
4.3.1 Product structure
The typical structure of the multilayer insulation blanket is as shown in Figure 4.
4.3.2 Models of multilayer insulation blanket and examples
The model of the multilayer insulation blanket is according to the requirements in Figure 5.
5 Raw materials
5.1 General requirements
5.1.1 The raw materials shall comply with the relevant standards; the product
5.1.2 According to the operating conditions of the cryogenic vessel, the compatibility
with oxygen shall be considered, when selecting raw materials.
5.1.3 The technological properties of raw materials shall be able to meet the
requirements of construction, baking temperature resistance, vacuuming of cryogenic
vessels.
5.1.4 When there are special requirements, the supplier and the buyer can negotiate
separately.
5.2 Spacing material
5.2.1 Types of spacing materials and their compatibility with oxygen
5.2.3 Glass fiber cloth
5.2.3.1 The glass fiber cloth shall meet the requirements of JC/T 170.
5.2.3.2 The thickness shall be tested, according to the method of GB/T 451.3, which
should be 0.05 mm ~ 0.25 mm.
5.2.3.3 The longitudinal tensile strength shall be tested, according to the method of
GB/T 12914, which should not be less than 0.06 kN/m.
5.2.3.4 It needs to be degreased and dewaxed; the content of combustibles shall be
tested, according to the method of GB/T 9914.2, which shall not exceed 0.2% (mass
fraction).
5.2.4 Chemical fiber paper
5.3 Heat-resistant radiation shield
5.3.1 Types of heat-resistant radiation shields and their compatibility with oxygen
5.3.1.1 Typical types of heat-resistant radiation shields include aluminum foil,
aluminized polyester film, etc.
5.3.1.2 The compatibility of the heat-resistant radiation shield with oxygen shall be
evaluated, according to 4.2 of GB/T 31481-2015.
5.3.2 Aluminum foil
5.3.3 Aluminized polyester film
5.3.3.1 Aluminized polyester film shall comply with the requirements of BB/T 0030-
2004.The surface shall have a continuous, bright luster, without oil traces; the edges
shall be smooth and flat. Looking at the light source, there shall be no obvious scratches,
holes, impurities, or aluminized layer falling off.
5.3.3.2 The base material of aluminized polyester film shall comply with the provisions
of GB/T 16958; the thickness should be 0.005 mm ~ 0.025 mm.
6 Technical requirements
6.1 Manufacturing environment requirements
6.1.1 The whole manufacturing process shall be carried out in a clean environment.
6.2 Manufacturing requirements for multilayer insulation units
6.2.1 The heat-resistant radiation shield can be provided with ventilation holes.
6.2.2 The spacing material and the heat-resistant radiation shield layer shall not be fixed
by chemical adhesives, such as adhesives and tapes.
6.2.3 The surface of the multilayer insulation unit shall be clean; there shall be no oil
stains, sweat stains, fingerprints, or other stains.
6.2.6 Apparent thermal conductivity
Take a representative sample of the multilayer insulation unit for testing. The apparent
thermal conductivity shall not be greater than 1.35 × 10-4 W/(m·K).
6.2.7 Outgassing rate
Take a representative sample of the multilayer insulation unit for testing. The outgassing
rate shall not exceed 8 × 10-7 Pa·m3/(s·g).
6.3 Manufacturing requirements for products
6.3.1 General requirements
6.3.2 Manufacturing requirements for multilayer insulation rolls
6.3.2.1 Aluminum foil tape should be used for the joint of spacing material or heat-
resistant radiation shield. It shall not use organic substrate tape. The interlayer joints
shall be staggered.
6.3.3 Manufacturing requirements for multilayer insulation blankets
6.3.3.1 Fixing measures shall be taken between the multilayer insulation units; the
fixings shall be clean and evenly distributed.
6.3.3.2 Chemical adhesives, such as adhesives and tapes, shall not be used for fixing.
7 Test methods
7.1 Appearance quality
The appearance quality shall be visually inspected as required. The surface cleanliness
shall meet the requirements of 6.3.1.1.
7.2 Indentation of the heat-resistant radiation shield
The indentation of the heat-resistant radiation shield shall be tested, according to the
method of GB/T 451.1, which is expressed as the distance between the edge of the heat-
resistant radiation shield and the edge of the spacing material. It shall comply with the
provisions of 6.2.4.
7.3 Width deviation
The width deviation shall be tested, according to the method of GB/T 451.1, which shall
comply with the provisions of 6.2.5.
7.4 Width misalignment
The width misalignment shall be tested, according to the method of GB/T 451.1,
expressed as the misalignment of the same side edge of the spacing material of 2
multilayer insulation units, which shall comply with the provisions of 6.3.1.2.
7.5 Apparent thermal conductivity
The apparent thermal conductivity shall be tested, according to the method specified in
Appendix A, which shall meet the requirements of 6.2.6.
7.6 Outgassing rate
The outgassing rate shall be tested, according to the method specified in Appendix B,
which shall meet the requirements of 6.2.7.
7.8 Compatibility test
7.8.1 The platinum wire combustion test of representative specimen and oxygen shall
be tested, according to the relevant methods in GB/T 31481-2015.
8 Inspection rules
8.1 Inspection classification
The inspection is divided into multilayer insulation unit inspection, product inspection,
performance test. The inspection items are as shown in Table 3.
8.2 Inspection of multilayer insulation unit
The inspection of multilayer insulation unit is a piece-by-piece inspection; the items are
as specified in Table 3.
8.3 Product inspection
The product inspection is a piece-by-piece inspection; the items are as specified in Table
3.
8.4 Performance test
If it is one of the following situations, the performance test shall be carried out. The test
items shall be in accordance with the provisions of Table 3.
9 Sign, product exit-factory information
9.1 Sign
9.1.1 Sign content
The product sign shall at least include the following.
9.1.2 Sign position
The product sign shall be indicated on the outer packaging.
9.2 Product exit-factory information
9.2.1 The product exit-factory information shall at least include the certificate of
conformity and quality certification documents.
9.2.2 The product certificate shall at least include the following contents.
9.2.3 The quality certificate shall at least include the following contents.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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