GB/T 8174-1987 Testing and evaluation of thermal insulation effect of equipment and pipelines
Some standard content:
UDC621.181.5.021/.022621.016/.018F04
National Standard of the People's Republic of China
GB8174-87
Methods of measuring and evaluating thermal insulation effects for equipments and pipesPublished on August 28, 1987
Published by the National Bureau of Standards
Implemented on June 1, 1988
National Standard of the People's Republic of China
Methods of measuring and evaluating thermal insulation effects for equipments and pipes pipesUDC621.181.5.021/
.022:621
.016/.018
GB8174—87
This standard aims to determine and evaluate the insulation effect of equipment, pipes and their accessories by testing the surface temperature and heat dissipation loss of the insulation structure, and makes principle provisions for the test and evaluation methods of the insulation effect of equipment and pipes. 1 Subject content and applicable model
This standard specifies several test methods for the surface temperature and heat dissipation loss of the insulation structure, various requirements for the test work, test organization and preparation, data processing methods, test errors, insulation effect evaluation methods and test report preparation. This standard applies to equipment, pipes and their accessories specified in GB4272. 2 Reference standards
GB2588
General rules for calculating thermal efficiency of equipment
Terms and terms of insulation materials
GB4132
General rules for thermal insulation technology of equipment and pipelines
GB4272
GB8175
3 Terms and terms
Guidelines for thermal insulation design of equipment and pipelines
Steady heat transfer
Heat transfer process in which the temperature of each point in an object does not change with time. 3.2. Heat flow*)
The amount of heat transferred from or to an object per unit time. Q(w)
3.3·Heat flux density*)
The heat flow per unit area perpendicular to the direction of heat flow. q
3.4Linear heat flux density*)
The heat flow per unit length.
（w/m）
Note: 1) Cited from GB4132.
2) Cited from 1SO7345-1985 "Thermal Insulation
3.5 Thermal Emissivity (Blackness) e
（w/m）
Physical Quantity and Definition".
The ratio of the emissivity of an object to the emissivity of a black body at the same temperature. 3.6 Heat Dissipation
Approved by the National Bureau of Standards on August 28, 1987
Building 321---Standard Query and Download Network
www. jz321. net
1.988-06-01 Implementation
GB 817487
The heat flux or linear heat flux lost from the outer surface of the insulation structure to the surrounding environment. g (or q.) (W/m2)
9(W/m)
4 Test method
4.1 Surface temperature test method
4.1.1 Thermocouple method
A method of directly and closely attaching a thermocouple to the outer surface of the insulation structure to measure its surface temperature. This is the basic method for testing the outer surface temperature of the insulation structure.
4.1.2 Surface thermometer method
A method of contacting the sensor of a thermocouple type, thermal resistance type or other surface thermometer with the outer surface of the insulation structure to measure its outer surface temperature. This is a common method for testing the surface temperature of the insulation structure. When measuring, the measuring point processing and reading correction should be carried out according to the characteristics of the instrument and the different outer surfaces of the insulation structure. If necessary, the thermocouple method should be used for comparison. 4.1.3 Infrared radiation thermometer method
A method of aiming an infrared radiation thermometer at the outer surface of the insulation structure to measure its surface temperature. When using a low-temperature infrared radiation thermometer for measurement, the thermal emissivity value of the measured surface should be correctly determined, and a reasonable distance and emission angle should be selected. This method is generally applicable to non-contact measurement and measurement of moving objects.
4.1.4 Infrared thermal imaging method
A method of scanning the outer surface of the measured insulation structure with an infrared thermal imager to reflect the temperature distribution of the outer surface of the insulation structure. This method is generally used to analyze the temperature distribution of the outer surface of the measured insulation structure, and is suitable for use in census or long-distance measurement. 4.2 Surface heat dissipation loss test method
4.2.1 Thermal balance method
A method of obtaining the heat dissipation loss value by measuring and calculating the heat balance principle. This method is a basic method for testing the heat dissipation loss of the surface of the insulation structure.
4.2.1.1·For equipment, the heat dissipation loss value of the insulation structure surface can be obtained by measuring and calculating the positive and negative balance method in accordance with GB2588. 4.2.1.2 For pipelines, the heat loss value of the surface of the insulation structure can be obtained by measurement and calculation using the exact difference method or the energy balance principle. 4.2.2 Heat flow meter method
Use a thermal resistance heat flow meter, bury its sensor in the insulation structure or stick it on the outer surface of the insulation structure to directly measure the heat loss value. This method is a common method for testing the heat loss of the surface of the insulation structure. 4.2.2.1 When the sensor of the heat flow meter is buried in the insulation structure, the measured result should be converted into the heat loss value of the outer surface of the insulation structure.
4.2.2.2 When the sensor of the heat flow meter is closely attached to the outer surface of the insulation structure, the surface thermal emissivity of the sensor should be consistent with the thermal emissivity of the measured surface, and the contact thermal resistance between the sensor and the measured surface should be minimized as much as possible. 4.2.3 Surface temperature method
A method for calculating the heat loss value according to the heat transfer theory based on the measured surface temperature, ambient temperature, wind speed, surface thermal emissivity, and the outer dimensions of the insulation structure. 4.2.4 Temperature difference method
The method of calculating the heat dissipation loss value according to the heat transfer theory by testing the inner and outer surface temperature of the insulation structure, the thickness of the insulation structure and the heat transfer performance of the insulation structure at the use temperature. 5 Test requirements
5.1 Test classification
According to different requirements and referring to GB6422, the insulation effect test of equipment, pipelines and their accessories is divided into three levels: 2
GB8174---87
The first level test is applicable to insulation projects using new technologies, new materials and new structures; a.
The second level test is applicable to the acceptance test of insulation projects after new construction, reconstruction, expansion and overhaul; b.
The third level test is applicable to the census and regular monitoring of insulation projects. c.
The first and second level tests should be undertaken by units with higher levels and approved by relevant competent authorities. 5.2 Test parameters, generally including the following values: a.
Outer surface temperature of insulation structure;
Heat dissipation loss of outer surface of insulation structure:
Ambient temperature, wind speed;
Outer surface temperature of equipment, pipelines and accessories; For equipment, pipelines and accessories without inner metal wall, the outer surface temperature can be d.
The temperature of the medium tested can be regarded as the outer surface temperature; e.
Other parameters such as thermal properties of insulation structure and materials. 5.3 Test instruments
Instruments and meters with corresponding accuracy should be reasonably selected according to the test level and test method. Requirements for measurement point layout:
Should correctly and representatively reflect the measured parameters; should comply with the use conditions of test instruments and meters; must meet the principle requirements of the test method and the requirements of measurement accuracy. c..
5.5 Sensor installation
Sensor installation should comply with the technical requirements for the use of corresponding instruments and meters. 5.6 On-site test conditions:
5.6.1 The influence of external factors on the test should be eliminated and reduced. The test should meet the one-dimensional stable heat transfer condition in principle. 5.6.1.1 Try to test under the condition of wind speed equal to or less than 0.5m/s. If it cannot be met, a wind shield should be added. 5.6.1.2 Outdoor tests should be carried out on cloudy days or at night. If it cannot be met, a sunshade should be added and tested after a period of stabilization.
Outdoor tests should be avoided in rainy and snowy weather conditions. 5.6.1.3
5.6.2 The ambient temperature should be measured 1m away from the measured location, and the influence of other heat sources should be avoided. 5.6.3 Other conditions should meet the requirements of the test method used. 6 Test organization and preparation work
Determine the test leader according to the test task, and equip trained testers according to different test levels. Collect various relevant information on the test site. Formulate and compile the test plan, which generally includes the following contents: Determination of the test system;
Determination of the calculation basis;
Selection of the parameters to be measured and the corresponding test methods, calculation procedures and formulas, and data; Determination of test instruments and meters;
Determination of test conditions, test duration, various parameters and test procedures; Preparation of test record forms;
Preparation of test work plan.
“Verify or calibrate instruments and meters to ensure the integrity of their functions and the accuracy of their values.6.4
6.5 Check the operation of the equipment, pipelines and their accessories under test, eliminate defects that affect the positive belt test, and prepare measuring points.6.6 When testing with multiple parameters such as the heat balance method and the temperature difference method, simultaneous testing must be carried out, and preliminary testing should be carried out when necessary.“In principle, the first-level test should be carried out using two different methods for comparison. If two methods cannot be used, one method is allowed to be used for multiple tests. The number of repeatability should be determined based on the deviation range of the test value, generally not less than 3 times. 7 Data Processing
7.1 The measured data are processed according to the following methods: 7.1.1 The surface temperature and heat loss of the pipeline insulation structure are processed by the method of calculating the arithmetic mean. When the heat loss is tested by the surface temperature method, the surface heat loss value can be calculated from the average surface temperature. 7.1.2 The surface temperature and heat loss of the equipment insulation structure are processed by the method of calculating the surface area weighted average. 7.2 For the heat dissipation loss of the insulation structure of equipment, pipelines and their accessories, if it is a year-round operating condition, the test value should be converted into the corresponding value under the local annual average temperature conditions; if it is a seasonal operating condition, it should be converted into the corresponding value under the local operating period average temperature conditions, according to formula (1):
q=gyear
Wherein: 9
Converted heat dissipation loss, W/m;
Tested heat dissipation loss, W/m\;
Annual (or local operating period) average external surface temperature of the insulation structure of equipment, pipelines and their accessories, K; T, - the external surface temperature of the insulation structure of the equipment, pipelines and their accessories during the test, K; T.
Local annual (or local operating period) average ambient temperature, K; - ambient temperature during the test, K.
7.3 For pipelines, the heat loss per unit area can be converted into the heat loss per unit length according to formula (2): =axD
Wherein: 9
Heat loss per unit length of pipe, W/m;
.--Heat loss per unit area, W/m;--Outer diameter of insulation structure, m.
8Test error
（1）
The first-level test shall make an error analysis of the measured parameters and a comprehensive error analysis of the test results. The comprehensive error of the test results is required to be no more than 15%, and the error of repeated tests is no more than 5%. 8.2 Error estimation shall be made for the second-level test; the comprehensive error of the test results is required to be no more than 20%, and the error of repeated tests is no more than 8%. 8.3 Error analysis or error estimation may not be made for the third-level test, but the error of repeated tests shall not exceed 10%. 9 Evaluation of thermal insulation effect
9.1 The test results shall be analyzed and evaluated in accordance with the relevant provisions of GB4272. 9.1.1 Equipment, pipelines and their accessories with an outer surface temperature higher than 323K (50°C) are considered unqualified and should be transformed by insulation technology.
9.1.2 Equipment, pipelines and their accessories with an outer surface temperature higher than 333K (60°C) are considered to be prone to scalding and should be treated with insulation measures. Note: 1) refers to the surface temperature when the ambient temperature is 298K (25℃) 9.1.3 The maximum allowable heat dissipation loss of equipment, pipelines and accessories after insulation is shown in Tables 1 and 2: Table 1 Maximum allowable heat dissipation loss value under seasonal operating conditions Equipment, pipelines and accessories outer surface
Temperature, K(℃)
Maximum allowable heat dissipation loss, W/m
(kcal/(m\-h))
Equipment, pipelines and accessories outer surface
Temperature, K(℃）
Maximum allowable heat dissipation loss, W /m
[kcal/(m*·h)]
Outer surface of equipment, pipelines and accessories
Temperature, K(℃）
Maximum allowable heat dissipation loss W/m
[kcal/(m\-h)]
GB8174—87
Table 2 Maximum allowable heat dissipation loss value for normal operation conditions 323
(350）
Any test value exceeding the maximum allowable heat dissipation loss value is considered unqualified, and technical measures such as thermal insulation transformation should be taken. 9.2 Analyze the quality of thermal insulation engineering, propose existing problems and make reasonable energy-saving suggestions or measures for the problems. The quality of its insulation project mainly includes the following contents:
Rationality of the use of insulation materials
Difference between the calculated economic thickness of the insulation layer and the actual thickness used; uniformity of the thickness of the insulation layer;
Strictness of the gap treatment of insulation material products; reliability of the form of the protective layer and the appearance quality; treatment of the expansion joints of the insulation structure;
Comprehensive quality evaluation in the construction of insulation projects. Test report
10.1 The test report includes: general description, test time, meteorological conditions, test objects, working conditions, measurement point location layout diagram, test parameters, data tables, test errors, insulation effect evaluation, etc. 10.1.1'The general description should include: task proposal, test purpose, test system, calculation basis, description of the use of non-standard test methods, etc. 10.1.2 The data table should include: main parameters of the equipment, calculation formulas and results, etc. 10.2 The test report shall be compiled into a book as a technical file after being signed by the person in charge of the test. Additional notes:
This standard was proposed by the National Energy Basics and Management Standardization Technical Committee. This standard was drafted by the Nanjing Fiberglass Research and Design Institute of the State Building Materials Industry Bureau and the China Institute of Standardization and Information Classification and Coding.
The main drafters of this standard are He Zhensheng, Dai Zizhu, Lu Xianjie, Sun Shiping, Li Zhouqun, Ye Shuhua, and Bai Yuzhen. Building 321---Standard Query and Download Network
|tt||People's Republic of China
National Standard
Testing and Evaluation of Thermal Insulation Effect of Equipment and Pipeline GB8174-87
Published by China Standards Press
(Beijing Fuwai Sanchonghe)
Printed by Beijing Printing Factory of China Standards Press and issued by Beijing Publishing House of Xinhua Bookstore||t t||Sold by Xinhua Bookstores in all regions
Copyright reserved. No measurement allowed
Printing sheet 1/2 Word count 10000
Format 880×12301/16
First edition February 1989 Second printing February 1989 Number of copies 1-6500
Book number: 155066·1-6093
Price 0.30 yuan
Heading 10682 The surface temperature and heat dissipation loss of the equipment insulation structure are processed by the method of calculating the weighted average of the surface area. 7.2 For the heat dissipation loss of the insulation structure of the equipment, pipelines and their accessories, if it is a year-round operating condition, the test value should be converted into the corresponding value under the local annual average temperature conditions; if it is a seasonal operating condition, it should be converted into the corresponding value under the local operating period average temperature conditions, according to formula (1):
q=gyear
Where: 9
Converted heat dissipation loss, W/m;
Tested heat dissipation loss, W/m\;
The annual (or local operating period) average external surface temperature of the insulation structure of the equipment, pipelines and their accessories, K; T, - The external surface temperature of the insulation structure of the equipment, pipelines and their accessories during the test, K; T.
The local annual (or local operating period) average ambient temperature, K; - The ambient temperature during the test, K.
7.3 For pipelines, the heat loss per unit area can be converted into the heat loss per unit length according to formula (2): =axD
Wherein: 9
Heat loss per unit length of pipe, W/m;
.--Heat loss per unit area, W/m;--Outer diameter of insulation structure, m.
8Test error
（1）
The first-level test shall make an error analysis of the measured parameters and a comprehensive error analysis of the test results. The comprehensive error of the test results is required to be no more than 15%, and the error of repeated tests is no more than 5%. 8.2 Error estimation shall be made for the second-level test; the comprehensive error of the test results is required to be no more than 20%, and the error of repeated tests is no more than 8%. 8.3 Error analysis or error estimation may not be made for the third-level test, but the error of repeated tests shall not exceed 10%. 9 Evaluation of thermal insulation effect
9.1 The test results shall be analyzed and evaluated in accordance with the relevant provisions of GB4272. 9.1.1 Equipment, pipelines and their accessories with an outer surface temperature higher than 323K (50°C) are considered unqualified and should be transformed by insulation technology.
9.1.2 Equipment, pipelines and their accessories with an outer surface temperature higher than 333K (60°C) are considered to be prone to scalding and should be treated with insulation measures. Note: 1) refers to the surface temperature when the ambient temperature is 298K (25℃) 9.1.3 The maximum allowable heat dissipation loss of equipment, pipelines and accessories after insulation is shown in Tables 1 and 2: Table 1 Maximum allowable heat dissipation loss value under seasonal operating conditions Equipment, pipelines and accessories outer surface
Temperature, K(℃)
Maximum allowable heat dissipation loss, W/m
(kcal/(m\-h))
Equipment, pipelines and accessories outer surface
Temperature, K(℃）
Maximum allowable heat dissipation loss, W /m
[kcal/(m*·h)]
Outer surface of equipment, pipelines and accessories
Temperature, K(℃）
Maximum allowable heat dissipation loss W/m
[kcal/(m\-h)]
GB8174—87
Table 2 Maximum allowable heat dissipation loss value for normal operation conditions 323
(350）
Any test value exceeding the maximum allowable heat dissipation loss value is considered unqualified, and technical measures such as thermal insulation transformation should be taken. 9.2 Analyze the quality of thermal insulation engineering, propose existing problems and make reasonable energy-saving suggestions or measures for the problems. The quality of its insulation project mainly includes the following contents:
Rationality of the use of insulation materials
Difference between the calculated economic thickness of the insulation layer and the actual thickness used; uniformity of the thickness of the insulation layer;
Strictness of the gap treatment of insulation material products; reliability of the form of the protective layer and the appearance quality; treatment of the expansion joints of the insulation structure;
Comprehensive quality evaluation in the construction of insulation projects. Test report
10.1 The test report includes: general description, test time, meteorological conditions, test objects, working conditions, measurement point location layout diagram, test parameters, data tables, test errors, insulation effect evaluation, etc. 10.1.1'The general description should include: task proposal, test purpose, test system, calculation basis, description of the use of non-standard test methods, etc. 10.1.2 The data table should include: main parameters of the equipment, calculation formulas and results, etc. 10.2 The test report shall be compiled into a book as a technical file after being signed by the person in charge of the test. Additional notes:
This standard was proposed by the National Energy Basics and Management Standardization Technical Committee. This standard was drafted by the Nanjing Fiberglass Research and Design Institute of the State Building Materials Industry Bureau and the China Institute of Standardization and Information Classification and Coding.
The main drafters of this standard are He Zhensheng, Dai Zizhu, Lu Xianjie, Sun Shiping, Li Zhouqun, Ye Shuhua, and Bai Yuzhen. Building 321---Standard Query and Download Network
|tt||People's Republic of China
National Standard
Testing and Evaluation of Thermal Insulation Effect of Equipment and Pipeline GB8174-87
Published by China Standards Press
(Beijing Fuwai Sanchonghe)
Printed by Beijing Printing Factory of China Standards Press and issued by Beijing Publishing House of Xinhua Bookstore||t t||Sold by Xinhua Bookstores in all regions
Copyright reserved. No measurement allowed
Printing sheet 1/2 Word count 10000
Format 880×12301/16
First edition February 1989 Second printing February 1989 Number of copies 1-6500
Book number: 155066·1-6093
Price 0.30 yuanbZxz.net
Heading 10682 The surface temperature and heat dissipation loss of the equipment insulation structure are processed by the method of calculating the weighted average of the surface area. 7.2 For the heat dissipation loss of the insulation structure of the equipment, pipelines and their accessories, if it is a year-round operating condition, the test value should be converted into the corresponding value under the local annual average temperature conditions; if it is a seasonal operating condition, it should be converted into the corresponding value under the local operating period average temperature conditions, according to formula (1):
q=gyear
Where: 9
Converted heat dissipation loss, W/m;
Tested heat dissipation loss, W/m\;
The annual (or local operating period) average external surface temperature of the insulation structure of the equipment, pipelines and their accessories, K; T, - The external surface temperature of the insulation structure of the equipment, pipelines and their accessories during the test, K; T.
The local annual (or local operating period) average ambient temperature, K; - The ambient temperature during the test, K.
7.3 For pipelines, the heat loss per unit area can be converted into the heat loss per unit length according to formula (2): =axD
Wherein: 9
Heat loss per unit length of pipe, W/m;
.--Heat loss per unit area, W/m;--Outer diameter of insulation structure, m.
8Test error
（1）
The first-level test shall make an error analysis of the measured parameters and a comprehensive error analysis of the test results. The comprehensive error of the test results is required to be no more than 15%, and the error of repeated tests is no more than 5%. 8.2 Error estimation shall be made for the second-level test; the comprehensive error of the test results is required to be no more than 20%, and the error of repeated tests is no more than 8%. 8.3 Error analysis or error estimation may not be made for the third-level test, but the error of repeated tests shall not exceed 10%. 9 Evaluation of thermal insulation effect
9.1 The test results shall be analyzed and evaluated in accordance with the relevant provisions of GB4272. 9.1.1 Equipment, pipelines and their accessories with an outer surface temperature higher than 323K (50°C) are considered unqualified and should be transformed by insulation technology.
9.1.2 Equipment, pipelines and their accessories with an outer surface temperature higher than 333K (60°C) are considered to be prone to scalding and should be treated with insulation measures. Note: 1) refers to the surface temperature when the ambient temperature is 298K (25℃) 9.1.3 The maximum allowable heat dissipation loss of equipment, pipelines and accessories after insulation is shown in Tables 1 and 2: Table 1 Maximum allowable heat dissipation loss value under seasonal operating conditions Equipment, pipelines and accessories outer surface
Temperature, K(℃)
Maximum allowable heat dissipation loss, W/m
(kcal/(m\-h))
Equipment, pipelines and accessories outer surface
Temperature, K(℃）
Maximum allowable heat dissipation loss, W /m
[kcal/(m*·h)]
Outer surface of equipment, pipelines and accessories
Temperature, K(℃）
Maximum allowable heat dissipation loss W/m
[kcal/(m\-h)]
GB8174—87
Table 2 Maximum allowable heat dissipation loss value for normal operation conditions 323
(350）
Any test value exceeding the maximum allowable heat dissipation loss value is considered unqualified, and technical measures such as thermal insulation transformation should be taken. 9.2 Analyze the quality of thermal insulation engineering, propose existing problems and make reasonable energy-saving suggestions or measures for the problems. The quality of its insulation project mainly includes the following contents:
Rationality of the use of insulation materials
Difference between the calculated economic thickness of the insulation layer and the actual thickness used; uniformity of the thickness of the insulation layer;
Strictness of the gap treatment of insulation material products; reliability of the form of the protective layer and the appearance quality; treatment of the expansion joints of the insulation structure;
Comprehensive quality evaluation in the construction of insulation projects. Test report
10.1 The test report includes: general description, test time, meteorological conditions, test objects, working conditions, measurement point location layout diagram, test parameters, data tables, test errors, insulation effect evaluation, etc. 10.1.1'The general description should include: task proposal, test purpose, test system, calculation basis, description of the use of non-standard test methods, etc. 10.1.2 The data table should include: main parameters of the equipment, calculation formulas and results, etc. 10.2 The test report shall be compiled into a book as a technical file after being signed by the person in charge of the test. Additional notes:
This standard was proposed by the National Energy Basics and Management Standardization Technical Committee. This standard was drafted by the Nanjing Fiberglass Research and Design Institute of the State Building Materials Industry Bureau and the China Institute of Standardization and Information Classification and Coding.
The main drafters of this standard are He Zhensheng, Dai Zizhu, Lu Xianjie, Sun Shiping, Li Zhouqun, Ye Shuhua, and Bai Yuzhen. Building 321---Standard Query and Download Network
|tt||People's Republic of China
National Standard
Testing and Evaluation of Thermal Insulation Effect of Equipment and Pipeline GB8174-87
Published by China Standards Press
(Beijing Fuwai Sanchonghe)
Printed by Beijing Printing Factory of China Standards Press and issued by Beijing Publishing House of Xinhua Bookstore||t t||Sold by Xinhua Bookstores in all regions
Copyright reserved. No measurement allowed
Printing sheet 1/2 Word count 10000
Format 880×12301/16
First edition February 1989 Second printing February 1989 Number of copies 1-6500
Book number: 155066·1-6093
Price 0.30 yuan
Heading 10683 The maximum allowable heat dissipation loss of equipment, pipelines and accessories after insulation is as shown in Tables 1 and 2: Table 1 Maximum allowable heat dissipation loss value under seasonal operating conditions Equipment, pipelines and accessories outer surface
Temperature, K(℃)
Maximum allowable heat dissipation loss, W/m
(kcal/(m\-h))
Equipment, pipelines and accessories outer surface
Temperature, K(℃）
Maximum allowable heat dissipation loss, W/m
[kcal/ (m*·h)]
Outer surface of equipment, pipelines and their accessories
Temperature, K(℃）
Maximum allowable heat loss W/m
[kcal/(m\-h)]
GB8174—87
Table 2 Maximum allowable heat loss value for normal operation conditions 323
(350）
Any test value exceeding the maximum allowable heat loss value is considered unqualified, and technical measures such as thermal insulation transformation should be taken. 9.2 Analyze the quality of thermal insulation engineering, propose problems and make reasonable energy-saving suggestions or measures for the problems. The quality of its insulation project mainly includes the following contents:
Rationality of the use of insulation materials
Difference between the calculated economic thickness of the insulation layer and the actual thickness used; uniformity of the thickness of the insulation layer;
Strictness of the gap treatment of insulation material products; reliability of the form of the protective layer and the appearance quality; treatment of the expansion joints of the insulation structure;
Comprehensive quality evaluation in the construction of insulation projects. Test report
10.1 The test report includes: general description, test time, meteorological conditions, test objects, working conditions, measurement point location layout diagram, test parameters, data tables, test errors, insulation effect evaluation, etc. 10.1.1'The general description should include: task proposal, test purpose, test system, calculation basis, description of the use of non-standard test methods, etc. 10.1.2 The data table should include: main parameters of the equipment, calculation formulas and results, etc. 10.2 The test report shall be compiled into a book as a technical file after being signed by the person in charge of the test. Additional notes:
This standard was proposed by the National Energy Basics and Management Standardization Technical Committee. This standard was drafted by the Nanjing Fiberglass Research and Design Institute of the State Building Materials Industry Bureau and the China Institute of Standardization and Information Classification and Coding.
The main drafters of this standard are He Zhensheng, Dai Zizhu, Lu Xianjie, Sun Shiping, Li Zhouqun, Ye Shuhua, and Bai Yuzhen. Building 321---Standard Query and Download Network
|tt||People's Republic of China
National Standard
Testing and Evaluation of Thermal Insulation Effect of Equipment and Pipeline GB8174-87
Published by China Standards Press
(Beijing Fuwai Sanchonghe)
Printed by Beijing Printing Factory of China Standards Press and issued by Beijing Publishing House of Xinhua Bookstore||t t||Sold by Xinhua Bookstores in all regions
Copyright reserved. No measurement allowed
Printing sheet 1/2 Word count 10000
Format 880×12301/16
First edition February 1989 Second printing February 1989 Number of copies 1-6500
Book number: 155066·1-6093
Price 0.30 yuan
Heading 10683 The maximum allowable heat dissipation loss of equipment, pipelines and accessories after insulation is as shown in Tables 1 and 2: Table 1 Maximum allowable heat dissipation loss value under seasonal operating conditions Equipment, pipelines and accessories outer surface
Temperature, K(℃)
Maximum allowable heat dissipation loss, W/m
(kcal/(m\-h))
Equipment, pipelines and accessories outer surface
Temperature, K(℃）
Maximum allowable heat dissipation loss, W/m
[kcal/ (m*·h)]
Outer surface of equipment, pipelines and their accessories
Temperature, K(℃）
Maximum allowable heat loss W/m
[kcal/(m\-h)]
GB8174—87
Table 2 Maximum allowable heat loss value for normal operation conditions 323
(350）
Any test value exceeding the maximum allowable heat loss value is considered unqualified, and technical measures such as thermal insulation transformation should be taken. 9.2 Analyze the quality of thermal insulation engineering, propose problems and make reasonable energy-saving suggestions or measures for the problems. The quality of its insulation project mainly includes the following contents:
Rationality of the use of insulation materials
Difference between the calculated economic thickness of the insulation layer and the actual thickness used; uniformity of the thickness of the insulation layer;
Strictness of the gap treatment of insulation material products; reliability of the form of the protective layer and the appearance quality; treatment of the expansion joints of the insulation structure;
Comprehensive quality evaluation in the construction of insulation projects. Test report
10.1 The test report includes: general description, test time, meteorological conditions, test objects, working conditions, measurement point location layout diagram, test parameters, data tables, test errors, insulation effect evaluation, etc. 10.1.1'The general description should include: task proposal, test purpose, test system, calculation basis, description of the use of non-standard test methods, etc. 10.1.2 The data table should include: main parameters of the equipment, calculation formulas and results, etc. 10.2 The test report shall be compiled into a book as a technical file after being signed by the person in charge of the test. Additional notes:
This standard was proposed by the National Energy Basics and Management Standardization Technical Committee. This standard was drafted by the Nanjing Fiberglass Research and Design Institute of the State Building Materials Industry Bureau and the China Institute of Standardization and Information Classification and Coding.
The main drafters of this standard are He Zhensheng, Dai Zizhu, Lu Xianjie, Sun Shiping, Li Zhouqun, Ye Shuhua, and Bai Yuzhen. Building 321---Standard Query and Download Network
|tt||People's Republic of China
National Standard
Testing and Evaluation of Thermal Insulation Effect of Equipment and Pipeline GB8174-87
Published by China Standards Press
(Beijing Fuwai Sanchonghe)
Printed by Beijing Printing Factory of China Standards Press and issued by Beijing Publishing House of Xinhua Bookstore||t t||Sold by Xinhua Bookstores in all regions
Copyright reserved. No measurement allowed
Printing sheet 1/2 Word count 10000
Format 880×12301/16
First edition February 1989 Second printing February 1989 Number of copies 1-6500
Book number: 155066·1-6093
Price 0.30 yuan
Heading 1068
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