GB 50264-1997 Code for design of thermal insulation engineering for industrial equipment and pipelines
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National Standard of the People's Republic of China (
GB50264-97
Design code for insulation engineeringof industrial equipment and pipeConstruction Standard
1997-02-27
1997-10-01
State Administration of Technical Supervision
Ministry of Construction of the People's Republic of China
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Jointly Issued
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National Standard of the People's Republic of China
Design code for insulation engineeringof industrial equipment and pipe pipeGB50264-97
Editor: Ministry of Chemical Industry of the People's Republic of ChinaApproval: Ministry of Construction of the People's Republic of ChinaEffective Date: October 1, 1997
1997Beijing
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Notice on the Release of the National Standard "Industrial Equipment and Pipeline Insulation Engineering Design Code"
Jianbiao [1997] No. 72
According to the requirements of the State Planning Commission's Document No. Jizong (1990) 160, the "Industrial Equipment and Pipeline Insulation Engineering Design Code" jointly formulated by the Ministry of Chemical Industry and relevant departments has been reviewed by relevant departments. The "Industrial Equipment and Pipeline Insulation Engineering Design Code" GB50264-97 is now approved as a mandatory national standard, effective from October 1, 1997. This standard shall be implemented on the date hereof. The Ministry of Chemical Industry shall be responsible for the management of this standard. The China Chengda Chemical Engineering Company of the Ministry of Chemical Industry shall be responsible for the specific interpretation and other work. The Standard and Quota Research Institute of the Ministry of Construction shall be responsible for the publication and distribution.
Ministry of Construction of the People's Republic of China
February 27, 1997
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2 Terms and Symbols
2.1 Terms
2.2 Symbols..
Selection of Insulation Materials
3.1 Performance Requirements of Insulation Layer Materials
3.2 Performance Requirements of Moisture-proof Layer Materials·
3.3 Performance Requirements of Protective Layer Materials·
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3.4 Main Performance Requirements of Adhesives, Sealants and Wear Resistants 4 Insulation calculation
Heat insulation calculation
Cold insulation calculation
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Calculation of insulation layer thickness
Calculation of heat and cold loss
Calculation of insulation layer outer surface temperature
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Calculation of temperature at the interface of inner and outer layers in case of double-layer insulation.......
Calculation of energy price and unit cost of insulation structure…Parameters of insulation calculation
Parameters of cold insulation calculation
Design of insulation structure
Composition of insulation structure…
Design requirements of insulation layer·
Design requirements for moisture-proof layer
Design requirements for protective layer
Appendix A Properties of commonly used insulation materials
Appendix B
Maximum allowable heat loss
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·(28)
（33)
（33)
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Appendix C Ambient temperature and relative humidity in various places
Electricity
Appendix D
Explanation of terms used in this code
Additional explanation...
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1.0.1 This code is formulated to meet the requirements of production technology, save energy, improve working conditions, improve economic benefits and ensure the quality of insulation engineering design. 2 This specification is applicable to the insulation engineering design of industrial equipment and pipelines with an outer surface temperature of -196℃ to 1.0.2
850℃.
This specification is not applicable to equipment and pipelines with special requirements in nuclear energy, aviation, and aerospace systems, as well as the insulation design of buildings, cold storage and long-distance buried pipelines. 1.0.3 The insulation design shall meet the following common requirements: 1.0.3.1 The insulation design shall correctly select materials that meet the current national and industry standards according to the use environment and the temperature of the insulated surface. New materials shall be selected only after being identified by the national testing department.
1.0.3.2 The insulation design shall be based on the requirements of process, energy saving, anti-condensation and economy. The insulation structure shall be determined. 1.0.4
In addition to implementing this specification, the insulation engineering design shall also comply with the provisions of the current relevant national standards and specifications.
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2 Terms and Symbols
2.1 Terms
2.1.1 Thermal insulation thermal insulation, insulation is a general term for heat insulation and cold insulation.
2 Thermal insulation heat insulation
In order to reduce the heat dissipation of equipment, pipelines and their accessories to the surrounding environment, the coating measures taken on their outer surface.
2.1.3 Cold insulation cold insulation
In order to reduce the heat from the surrounding environment transferred into the low-temperature equipment and pipelines, and to prevent condensation on the outer wall surface of low-temperature equipment and pipelines, the coating measures taken on their outer surface. 2.1.4 Thermal insulation layer thermal insulation layer Insulation materials and products that play a major role in maintaining the stability of the medium temperature. 2.1.5 Thermal insulation structure thermal insulation construction A structural complex composed of an insulation layer, a moisture-proof layer, a protective layer, etc. sEconomic thickness economicthickness
After insulation, the thickness calculated when the sum of the annual heat dissipation loss and the annual amortization cost of the insulation project investment is the minimum. 2.1.7 Design service years designserviceyears The number of years (n) selected when calculating the economic thickness, or the normal service life of the insulation project.
2.1.8 Allowable service temperature of insulation materials
allowservicetemperaturetruefor
insulationmaterials
The temperature at which insulation materials and their products do not deform, melt, coke, become brittle, loosen, or lose strength during long-term operation. Engineering Construction Standard Full-text Information System
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coldbridge
A component buried in the cold insulation layer with a large thermal conductivity that causes a large loss of cold.
Average temperature of insulation materials
materials
meantemperaturetrueofinsulation
The average temperature of the inner surface of the insulation layer and the outer surface of the insulation layer of the insulation material under the use environment.
Heat capacity of medium
Heat capacity of pipe
Nominal diameter
Inner diameter of pipe
Outer diameter of equipment or pipe
Outer diameter of inner insulation layer
Outer diameter of outer insulation layer
Tax coefficient
Annual interest rate (compound interest rate)
Correction coefficient of cold insulation thickness
Additional coefficient of heat loss at the place where the pipe passes through the hanger. Interest-bearing years or depreciation period
Energy price, a general term for heat price and cold price
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Cold price at (T～—39℃)
Cold price at (—40～-196℃)
Unit price of insulation material
Unit price of moisture-proof material||t t||Unit price of protective layer material
Unit cost of insulation structure
Continued table of heat loss expressed per meter of pipeline or per meter of equipment
"Maximum allowable" heat loss expressed per meter of pipeline or per meter of equipment Heat loss expressed per square meter of insulation layer outer surface\Maximum allowable" heat loss expressed per square meter of insulation layer outer surface Insulation project investment loan allocation rate, compound interest Equipment and pipeline outer surface temperature
Inner insulation layer outer surface temperature
Outer insulation layer outer surface temperature
Permitted safe use temperature of outer insulation material Ambient temperature
Dew point temperature
Average temperature
Annual operation time
Residence time of medium in pipeline without freezing||tt| |Volume of medium
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Volume of pipe
Heat release coefficient by convection
Heat release coefficient by radiation
Heat release coefficient of the outermost surface of the insulation layer to the surrounding airLinear expansion coefficient
Thickness of insulation layer (total thickness for double layers)
Thickness of inner insulation layer
Thickness of outer insulation layerbzxz.net
Thermal conductivity at average temperature
Thermal conductivity at room temperature
Thermal conductivity of inner insulation material
Thermal conductivity of outer insulation material
Density of medium
Density of pipe
Relative humidity of surrounding air
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Selection of Insulation Materials
3.1 Performance Requirements for Insulation Layer Materials
3.1.1 Insulation layer materials should be selected to provide products that can provide thermal conductivity equations or graphs that vary with temperature. For loose or compressible insulation materials, products that can provide thermal conductivity equations or graphs at the use density should be selected. During the feasibility study and preliminary design stages, the data specified in the performance of commonly used insulation materials in Appendix A of this specification can be used for insulation calculations.
3.1.2 During operation, when the average temperature of the thermal insulation material is lower than 350℃, its thermal conductivity shall not be greater than 0.12W/(m·℃), and when the average temperature of the cold insulation material is lower than (27℃), its thermal conductivity shall not be greater than 0.064W/(m·℃). 3.1.3 The density of hard materials for heat preservation shall not exceed 300kg/m3; the density of soft materials and semi-hard products shall not exceed 200kg/m3; the density of cold insulation materials shall not exceed 200kg/m3.
3.1.4 The compressive strength of hard materials used for heat preservation shall not be less than 0.4MPa; the compressive strength of hard materials used for cold insulation shall not be less than 0.15MPa. 3.1.5 The moisture content of heat insulation materials shall not exceed 7.5% (weight ratio, the same below); the moisture content of cold insulation materials shall not exceed 1%.
3.1.6 The insulation layer material should be selected to provide products with test certificates of allowable use temperature and non-flammability, flame retardancy and flammability performance; for cold insulation materials, water absorption, hygroscopicity and hydrophobicity test certificates are also required. For hard insulation materials, the linear expansion or contraction rate data of the material is also required.
3.1.7 Insulation materials used in contact with the surface of austenitic stainless steel shall comply with the provisions of the "Industrial Equipment and Pipeline Insulation Engineering Construction Acceptance Code" (GBJ126) on chloride ion content.
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The combustion performance of the insulation layer material shall comply with the combustion level specified in the current national standard "Building Material Combustion Performance Classification Method" (GB8624) according to the different outer surface temperatures of the insulated process equipment and pipelines, and shall comply with the following provisions: 3.1.8.1 When the outer surface temperature T of the insulated equipment and pipelines is greater than 100℃, the insulation layer material shall meet the performance requirements of non-combustible Class A materials. 3.1.8.2 When the outer surface temperature T of the insulated equipment and pipelines is less than or equal to 100℃, the insulation layer material shall not be lower than the performance requirements of flame-retardant Class B1 materials. 3.1.8.3 The outer surface temperature T of the insulated equipment and pipelines When the temperature is less than or equal to 50℃, the performance requirements of foam plastic insulation materials with protective layers shall not be lower than those of general flammability B2 grade materials.
3.2 Performance requirements for moisture-proof layer materials
3.2.1 The moisture-proof layer materials shall be selected with anti-vapor permeability, waterproof and moisture-proof properties, and their water absorption rate shall not exceed 1%. 2 The combustion performance of moisture-proof layer materials shall comply with the provisions of Article 3.1.8 of this Code. 3.2.2
3.2.3 The moisture-proof layer materials shall be selected with chemically stable, non-toxic and corrosion-resistant materials, and shall not corrode or dissolve the insulation layer and protective layer materials. 3.2.4 The moisture-proof layer materials shall be selected with materials that do not soften, bubble or melt in summer, and do not become brittle, crack or fall off when used at low temperatures. 3.2.5 The softening temperature of the smearable moisture-proof layer material shall not be lower than 65°C, and the bonding strength shall not be less than 0.15MPa; the volatile matter shall not be greater than 30%. 3.3 Performance requirements for protective layer materials
3.3.1 The protective layer material shall be selected with high strength, shall not soften or crack under the ambient temperature of use, and shall be resistant to aging. Its service life shall not be less than the designed service life. The designed service life of the thermal insulation protective layer material for national key projects shall be greater than 10 years. For cold insulation, it shall reach 12 to 18 years.
3.3.2 The protective layer material shall have the properties of being waterproof, moisture-proof, resistant to atmospheric corrosion, and having good chemical stability; and shall not corrode or dissolve the moisture-proof layer or the thermal insulation layer. Engineering Construction Standard Full-text Information System1 The insulation layer material should be selected to provide a thermal conductivity equation or chart that changes with temperature. For loose or compressible insulation materials, products that can provide a thermal conductivity equation or chart at the use density should be selected. In the feasibility study and preliminary design stages, the data specified in the performance of commonly used insulation materials in Appendix A of this specification can be used for insulation calculations.
3.1.2 During operation, when the average temperature of the thermal insulation material is lower than 350℃, its thermal conductivity shall not be greater than 0.12W/(m·℃), and when the average temperature of the cold insulation material is lower than (27℃), its thermal conductivity shall not be greater than 0.064W/(m·℃). 3.1.3 The density of hard insulation materials shall not be greater than 300kg/m; the density of soft materials and semi-hard products shall not be greater than 200kg/m3, and the density of cold insulation materials shall not be greater than 200kg/m.
3.1.4 The compressive strength of hard materials used for heat preservation shall not be less than 0.4MPa; the compressive strength of hard materials used for cold preservation shall not be less than 0.15MPa. 3.1.5 The moisture content of heat-insulating materials shall not be greater than 7.5% (weight ratio, the same below); the moisture content of cold-insulating materials shall not be greater than 1%.
3.1.6 The insulation layer material should be selected to provide products with test certificates of allowable use temperature and non-flammability, flame retardancy and flammability performance; for cold-insulating materials, water absorption, hygroscopicity and hydrophobicity test certificates are also required. For hard insulation materials, the linear expansion or contraction rate data of the material is also required.
3.1.7 The insulation materials used in contact with the surface of austenitic stainless steel shall comply with the provisions on chloride ion content in the "Code for Construction Acceptance of Industrial Equipment and Pipeline Insulation Engineering" (GBJ126).
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The combustion performance of the insulation layer material shall comply with the combustion grade specified in the current national standard "Classification Method for Combustion Performance of Building Materials" (GB8624) according to the different outer surface temperatures of the insulated process equipment and pipelines, and shall comply with the following provisions: 3.1.8.1 When the outer surface temperature T of the insulated equipment and pipelines is greater than 100℃, the insulation layer material shall meet the performance requirements of non-combustible Class A materials. 3.1.8.2 When the outer surface temperature T of the insulated equipment and pipelines is less than or equal to 100℃, the insulation layer material shall not be lower than the performance requirements of flame-retardant Class B1 materials. 3.1.8.3 When the outer surface temperature T of the insulated equipment and pipelines is less than or equal to 50℃, the performance requirements of foam plastic insulation layer materials with protective layers shall not be lower than those of general combustible Class B2 materials.
3.2 Performance requirements for moisture-proof layer materials
3.2.1 The moisture-proof layer materials should be selected with anti-vapor permeability, waterproof and moisture-proof properties, and the water absorption rate should not exceed 1%. 2 The combustion performance of the moisture-proof layer materials should comply with the provisions of Article 3.1.8 of this Code. 3.2.2
3.2.3 The moisture-proof layer materials should be selected with chemically stable, non-toxic and corrosion-resistant materials, and should not corrode or dissolve the insulation layer and protective layer materials. 3.2.4 The moisture-proof layer materials should be selected with materials that do not soften, bubble or melt in summer, and do not become brittle, crack or fall off when used at low temperatures. 3.2.5 The softening temperature of the smearable moisture-proof layer material shall not be lower than 65°C, and the bonding strength shall not be less than 0.15MPa; the volatile matter shall not be greater than 30%. 3.3 Performance requirements for protective layer materials
3.3.1 The protective layer material shall be selected with high strength, shall not soften or crack under the ambient temperature of use, and shall be resistant to aging. Its service life shall not be less than the designed service life. The designed service life of the thermal insulation protective layer material for national key projects shall be greater than 10 years. For cold insulation, it shall reach 12 to 18 years.
3.3.2 The protective layer material shall have the properties of being waterproof, moisture-proof, resistant to atmospheric corrosion, and having good chemical stability; and shall not corrode or dissolve the moisture-proof layer or the thermal insulation layer. Engineering Construction Standard Full-text Information System1 The insulation layer material should be selected to provide a thermal conductivity equation or chart that changes with temperature. For loose or compressible insulation materials, products that can provide a thermal conductivity equation or chart at the use density should be selected. In the feasibility study and preliminary design stages, the data specified in the performance of commonly used insulation materials in Appendix A of this specification can be used for insulation calculations.
3.1.2 During operation, when the average temperature of the thermal insulation material is lower than 350℃, its thermal conductivity shall not be greater than 0.12W/(m·℃), and when the average temperature of the cold insulation material is lower than (27℃), its thermal conductivity shall not be greater than 0.064W/(m·℃). 3.1.3 The density of hard insulation materials shall not be greater than 300kg/m; the density of soft materials and semi-hard products shall not be greater than 200kg/m3, and the density of cold insulation materials shall not be greater than 200kg/m.
3.1.4 The compressive strength of hard materials used for heat preservation shall not be less than 0.4MPa; the compressive strength of hard materials used for cold preservation shall not be less than 0.15MPa. 3.1.5 The moisture content of heat-insulating materials shall not be greater than 7.5% (weight ratio, the same below); the moisture content of cold-insulating materials shall not be greater than 1%.
3.1.6 The insulation layer material should be selected to provide products with test certificates of allowable use temperature and non-flammability, flame retardancy and flammability performance; for cold-insulating materials, water absorption, hygroscopicity and hydrophobicity test certificates are also required. For hard insulation materials, the linear expansion or contraction rate data of the material is also required.
3.1.7 The insulation materials used in contact with the surface of austenitic stainless steel shall comply with the provisions on chloride ion content in the "Code for Construction Acceptance of Industrial Equipment and Pipeline Insulation Engineering" (GBJ126).
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The combustion performance of the insulation layer material shall comply with the combustion grade specified in the current national standard "Classification Method for Combustion Performance of Building Materials" (GB8624) according to the different outer surface temperatures of the insulated process equipment and pipelines, and shall comply with the following provisions: 3.1.8.1 When the outer surface temperature T of the insulated equipment and pipelines is greater than 100℃, the insulation layer material shall meet the performance requirements of non-combustible Class A materials. 3.1.8.2 When the outer surface temperature T of the insulated equipment and pipelines is less than or equal to 100℃, the insulation layer material shall not be lower than the performance requirements of flame-retardant Class B1 materials. 3.1.8.3 When the outer surface temperature T of the insulated equipment and pipelines is less than or equal to 50℃, the performance requirements of foam plastic insulation layer materials with protective layers shall not be lower than those of general combustible Class B2 materials.
3.2 Performance requirements for moisture-proof layer materials
3.2.1 The moisture-proof layer materials should be selected with anti-vapor permeability, waterproof and moisture-proof properties, and the water absorption rate should not exceed 1%. 2 The combustion performance of the moisture-proof layer materials should comply with the provisions of Article 3.1.8 of this Code. 3.2.2
3.2.3 The moisture-proof layer materials should be selected with chemically stable, non-toxic and corrosion-resistant materials, and should not corrode or dissolve the insulation layer and protective layer materials. 3.2.4 The moisture-proof layer materials should be selected with materials that do not soften, bubble or melt in summer, and do not become brittle, crack or fall off when used at low temperatures. 3.2.5 The softening temperature of the smearable moisture-proof layer material shall not be lower than 65°C, and the bonding strength shall not be less than 0.15MPa; the volatile matter shall not be greater than 30%. 3.3 Performance requirements for protective layer materials
3.3.1 The protective layer material shall be selected with high strength, shall not soften or crack under the ambient temperature of use, and shall be resistant to aging. Its service life shall not be less than the designed service life. The designed service life of the thermal insulation protective layer material for national key projects shall be greater than 10 years. For cold insulation, it shall reach 12 to 18 years.
3.3.2 The protective layer material shall have the properties of being waterproof, moisture-proof, resistant to atmospheric corrosion, and having good chemical stability; and shall not corrode or dissolve the moisture-proof layer or the thermal insulation layer. Engineering Construction Standard Full-text Information System
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