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GB/T 31480-2015 English PDF (GBT31480-2015)
GB/T 31480-2015 English PDF (GBT31480-2015)
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GB/T 31480-2015: Materials for high vacuum multilayer insulation of cryogenic vessel
GB/T 31480-2015
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
Materials for high vacuum multilayer insulation of
cryogenic vessel
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
GB/T 16958 Biaxially oriented polyester film for package
qualification certificate shall be provided.
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
5.2.1.1 Typical types of spacing materials include glass fiber paper, glass fiber cloth,
chemical fiber paper, synthetic fiber screen, etc.
5.2.1.2 The compatibility of the spacing material with oxygen shall be evaluated,
according to 4.3 of GB/T 31481-2015.
5.2.2 Glass fiber paper
5.2.2.1 The thickness shall be tested according to the method of GB/T 451.3, which
should not be greater than 0.08 mm.
5.2.2.2 Quantitatively test shall be according to the method of GB/T 451.2, which
should be (14 ± 2.0) g/m2.
5.2.2.3 The longitudinal tensile strength shall be tested, according to the method of
GB/T 12914, which should not be less than 0.03 kN/m.
5.2.2.4 The content of combustibles shall be tested, according to the method of GB/T
9914.2, which should not exceed 1.0% (mass fraction).
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
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.
5.3.3.3 The thickness of the aluminized layer shall be tested, according to the method
of GB/T 15717, which should not be greater than 1.0 Ω/□ (resistance method).
5.3.3.4 The uniformity of the aluminized layer shall be tested, according to the method
of GB/T 15717, which should be better than ±10%.
5.3.3.5 The adhesion of the aluminized layer (represented by the peeling area of the
aluminized layer) shall be tested, according to the method in 6.12 of BB/T 0030-2004,
which shall not exceed 10%.
6 Technical requirements
6.1 Manufacturing environment requirements
6.1.1 The whole manufacturing process shall be carried out in a clean environment.
6.1.2 The surface of the production equipment, tooling, tools, which are in contact with
the material, shall be kept clean and free of oil.
6.1.3 The human body shall avoid direct contact with raw materials, during the
production process.
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.
6.2.4 The spacing material shall be parallel to the edge of the heat-resistant radiation
shield; the width of the spacing material shall be greater than the width of the heat-
resistant radiation shield. The heat-resistant radiation shield shall be evenly distributed
in the middle of the spacing material; the indentation on both sides of the heat-resistant
radiation shield shall be not less than 2 mm and not more than 18 mm.
6.2.5 The width of the multilayer insulation unit shall be subject to the width of the
spacing material; the allowable deviation of its width shall comply with the provisions
6.3.2.3 The length of the core of the multilayer insulation roll shall not be less than the
width of the product; either end shall not be recessed into the product.
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.
6.3.3.3 There shall be no obvious deviation in the thickness of the same multilayer
insulation blankets.
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 ...
Get QUOTATION in 1-minute: Click GB/T 31480-2015
Historical versions: GB/T 31480-2015
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GB/T 31480-2015: Materials for high vacuum multilayer insulation of cryogenic vessel
GB/T 31480-2015
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
Materials for high vacuum multilayer insulation of
cryogenic vessel
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
GB/T 16958 Biaxially oriented polyester film for package
qualification certificate shall be provided.
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
5.2.1.1 Typical types of spacing materials include glass fiber paper, glass fiber cloth,
chemical fiber paper, synthetic fiber screen, etc.
5.2.1.2 The compatibility of the spacing material with oxygen shall be evaluated,
according to 4.3 of GB/T 31481-2015.
5.2.2 Glass fiber paper
5.2.2.1 The thickness shall be tested according to the method of GB/T 451.3, which
should not be greater than 0.08 mm.
5.2.2.2 Quantitatively test shall be according to the method of GB/T 451.2, which
should be (14 ± 2.0) g/m2.
5.2.2.3 The longitudinal tensile strength shall be tested, according to the method of
GB/T 12914, which should not be less than 0.03 kN/m.
5.2.2.4 The content of combustibles shall be tested, according to the method of GB/T
9914.2, which should not exceed 1.0% (mass fraction).
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
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.
5.3.3.3 The thickness of the aluminized layer shall be tested, according to the method
of GB/T 15717, which should not be greater than 1.0 Ω/□ (resistance method).
5.3.3.4 The uniformity of the aluminized layer shall be tested, according to the method
of GB/T 15717, which should be better than ±10%.
5.3.3.5 The adhesion of the aluminized layer (represented by the peeling area of the
aluminized layer) shall be tested, according to the method in 6.12 of BB/T 0030-2004,
which shall not exceed 10%.
6 Technical requirements
6.1 Manufacturing environment requirements
6.1.1 The whole manufacturing process shall be carried out in a clean environment.
6.1.2 The surface of the production equipment, tooling, tools, which are in contact with
the material, shall be kept clean and free of oil.
6.1.3 The human body shall avoid direct contact with raw materials, during the
production process.
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.
6.2.4 The spacing material shall be parallel to the edge of the heat-resistant radiation
shield; the width of the spacing material shall be greater than the width of the heat-
resistant radiation shield. The heat-resistant radiation shield shall be evenly distributed
in the middle of the spacing material; the indentation on both sides of the heat-resistant
radiation shield shall be not less than 2 mm and not more than 18 mm.
6.2.5 The width of the multilayer insulation unit shall be subject to the width of the
spacing material; the allowable deviation of its width shall comply with the provisions
6.3.2.3 The length of the core of the multilayer insulation roll shall not be less than the
width of the product; either end shall not be recessed into the product.
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.
6.3.3.3 There shall be no obvious deviation in the thickness of the same multilayer
insulation blankets.
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 ...
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