1 General Provisions
1.0.1 This code is formulated in order to meet the requirements of production process and energy saving and emission reduction, improve working condition and economic benefit and guarantee the design quality of thermal insulation engineering.
1.0.2 This code is applicable to design of industrial equipment and insulation engineering of pipeline with outside surface temperature at -196℃~850℃.
This code is inapplicable to the design of equipment and pipeline in the nuclear energy, aviation and space system for special purpose and of pipeline insulation engineering in buildings, refrigeratory and buried type.
1.0.3 Thermal insulation design shall meet the following requirements:
1 In design of insulation engineering, materials shall be in conformity with current relevant national standard and selected depending on operating environment, materials of insulating equipment and pipeline and surface temperature. For new materials, they shall pass the test by the national legal inspection department before being used.
2 Thermal insulation design shall be subjected to calculation according to the requirements of technology, energy saving, anti-condensation and economical efficiency and the thermal insulation construction shall be determined.
1.0.4 Design of industrial equipment and pipeline insulation engineering shall not only meet the requirements of this code but also comply with those in the national current standards.
2 Terms and Symbols
2.1 Terms
2.1.1 Thermal insulation
A general term for heat and cold insulation.
2.1.2 Heat insulation
Cladding on the external surface to reduce equipment, pipeline and its accessories to radiate heat to surrounding environment or lower surface temperature.
2.1.3 Cold insulation
Cladding on the external surface to reduce the heat of surrounding environment into the low-temperature equipment and pipeline and prevent their outer wall surface against condensing.
2.1.4 Thermal insulation layer
Thermal insulation material and its products which play a key role in keeping the medium temperature stable.
2.1.5 Rigid insulation
The products can basicaly maintain the original state when being used, at the load of 2×10-3MPa, condensability ratio is less than 6% and they can not be bendable.
2.1.6 Semi-rigid insulation
At the load of 2× 10-3 MPa, products condensability is between 6% and 30%. When being bent 90°, the products can recover the shape.
2.1.7 Soft insulation
At load of 2×10-3 MPa, product condensability is above 30% and the products can be bent over 90° without damages.
2.1.8 Thermal insulation construction
It consists of thermal insulation layer, vapor barrier and protective jacket.
2.1.9 Economic thickness
The calculation thickness when the sum of expenses for annual heat radiation loss after insulation and annual amortized expenses for insulation engineering investment is minimum value.
2.1.10 Design service life
Number of years selected for calculating economic thickness or the number of years for normal use of insulation engineering.
2.1.11 Maximum service temperature
Maximum temperature thermal insulation product can bear when normal use is guaranteed.
2.1.12 Cold bridge
Parts buried in cold insulation layer, with so large heat flux density to lead to much loss of cooling capacity.
2.2 Symbols
C——Heat capacity of media ;
Cp——Heat capacity of pipe wall;
D——Inside diameter of pipeline;
D0——External diameter of pipeline or equipment;
D1——External diameter of internal thermal insulation layer;
D2——External diameter of external thermal insulation layer;
Fi——Loss of insulation material and tax coefficient;
i——Annual (compound) rate;
K——Correction factor of cold insulation thickness;
Kr——thermal loss additional coefficient at the place where the pipeline passes through the hanger;
n——Years of interest accrual or depreciation life;
PE——A general term for energy cost, heat price and cold price;
PH——Heat price;
Pc——Cold price;
Pc1——Cold price at (Ta~-39℃);
Pc2——Cold price at (-40℃~-196℃);
Pi——Unit price of insulation material to factory;
P9——Unit price of protective jacket meterials;
PT——Unit cost of thermal insulation construction;
q——Heat loss expressed by pipeline length per meter;
[q]——Maximum allowable heat loss in pipeline length per meter;
Foreword I
1 General Provisions
2 Terms and Symbols
2.1 Terms
2.2 Symbols
3 Basic Requirements
4 Selection of Thermal Insulation Material
4.1 Requirements of Insulation Material Performance
4.2 Requirement of Vapor Barrier Performance
4.3 Requirement of Protective Jacket Performance
4.4 Requirement of Binder, Sealant and Anti-Abrasive Performance
5 Calculation of Thermal Insulation
5.1 Calculation of Heat Insulation
5.2 Calculation of Cold Insulation
5.3 Calculation of Thermal Insulation Thickness
5.4 Calculation of Heat and Cold Loss
5.5 Calculation of Thermal Insulation Layer Outer Surface Temperature
5.6 Calculation of Interface Temperature for Double Insulation Layers
5.7 Calculation of Energy Price and Insulation Construction Unit Price
5.8 Calculation Parameter of Heat Insulation
5.9 Calculation Parameter of Cold Insulation
6 Design of Thermal Insulation Construction
6.1 Components of Thermal Insulation Construction
6.2 Requirements of Thermal Insulation Layer Design
6.3 Requirement of Vapour Barrier Design
6.4 Requirement of Protective Jacket Design
Appendix A Performance of Commonly used Insulation Material
Appendix B Maximum Allowance Heat Loss
Appendix C List of Ambient Temperature, Relative Humidity, Dew Point in Different Areas
Appendix D Relation of ~δ for Insulation Thickness Calculation
Appendix E Performance of Binder, Sealant, Anti-abrasive, Mastic and Polyurethane Waterproof Membrane
Appendix F Costs of Insulation Construction
Explanation of Wording in this Code
List of Quoted Standards
