GBJ 93-1986 Industrial Automation Instrumentation Engineering Construction and Acceptance Specification GBJ93-86
Some standard content:
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Industrial Automation Instrument Engineering
Construction and Acceptance Specifications
GBJ93—86
Engineering Construction Standard Full-text Information System
W Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Industrial Automation Instrument Engineering Construction
And Acceptance Specifications
GBJ93—86
Editor Department: Chemical Engineering of the People's Republic of China Industry Ministry Approval Department: State Planning Commission of the People's Republic of China Effective Date: January 1, 1987
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the Release of "Industrial Automation Instrument Engineering Construction and Acceptance Specification"
Ji Biao [1986] No. 753
According to the requirements of the original National Construction Commission (82) Jianshijizi No. 14 Notice, the "Industrial Automation Instrument Engineering Construction and Acceptance Specification" edited by the Ministry of Chemical Industry has been reviewed by relevant departments. The "Industrial Automation Instrument Engineering Construction and Acceptance Specification" GBJ93-86 is now approved as a national standard and will be implemented from January 1, 1987. This specification is managed by the Ministry of Chemical Industry, and its specific interpretation and other work is the responsibility of the Construction Technology Research Institute of the Ministry of Chemical Industry. The publication and distribution is organized by the Basic Construction Standards and Quotas Research Institute of our Commission. State Planning Commission
May 14, 1986
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Preparation Instructions
According to the requirements of the Notice No. 14 of the former State Construction Commission (82) Jianshijizi, our Ministry organized the Ministry of Nuclear Industry, the Ministry of Water Resources and Electric Power, and the Ministry of Metallurgy, as well as the Sichuan Provincial and Shanghai Municipal Planning (Construction) Commissions to jointly prepare the "Industrial Automation Instrument Engineering Construction and Acceptance Specifications". This specification summarizes the experience in the design, construction and use of industrial automation instrument engineering over the past 30 years since the founding of the People's Republic of China, refers to relevant domestic and foreign materials, and conducts extensive investigations and research and solicits opinions during the preparation process. Finally, our Ministry will review and finalize it together with relevant departments.
This specification is divided into twelve chapters and four appendices. The main contents include: general principles, source components, instrument panels (boxes, operating tables), instrument equipment, instrument power supply equipment and installation of gas and liquid supply systems, laying of electrical lines for instruments, electrical explosion protection and grounding, laying of instrument pipelines, degreasing, protection, instrument adjustment and project acceptance. With the development of construction, new technologies, new processes, new materials and new machines will continue to emerge. It is hoped that all units will seriously summarize experience and pay attention to accumulating information in the process of implementing this specification. If you find that there is a need for modification and supplementation, please send your opinions and relevant information to the Construction Technology Research Institute of the Ministry of Chemical Industry (Shijiazhuang City, Hebei Province) for reference in future revisions.
Ministry of Chemical Industry
January 1986
Engineering Construction Standard Full Text Information System
W.bzsoso.cO Engineering Construction Standard Full Text Information System
Chapter 1 General
Installation of Source Components
Chapter 2
Section 1
Section 2
General Provisions·
Temperature Source Components
Section 3
Pressure Source Components
Section 4 Flow Source Components
Section 5 Level Source Components.
Section 6 Analysis of Source Components
Chapter 3 Installation of Instrument Panels (Boxes, Operation Tables): Section 1
General Provisions
Section 2
Installation of Instrument Panels (Boxes, Operation Tables)
Chapter 4 Installation of Instrument Equipment
Section 1
Section 2
Section 3
Section 4
Section 5
Section 6
Section 7
General Provisions||tt| |Temperature instrument
Pressure instrument
Flow meter
Level instrument
Analytical instrument
Regulating valve, actuator and solenoid valve·
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Chapter 5 Installation of instrument power supply equipment and gas and liquid supply systems*. (15 )
Section 1 Power Supply Equipment.
Section 2 Gas Supply System
Section 3 Liquid Supply System
Chapter 6 Laying of Electrical Lines for Instruments
Section 1 General Provisions
Section 2 Installation of Brackets·
Section 3 Installation of Junction Ducts
Engineering Construction Standards Full-text Information System
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Engineering Construction Standard Full Text Information System
Section 4 Laying of Cable (Line) Protection TubesSection 5 Laying of Cables..
Section 6 Laying of Compensating Wires and Wires
Section 7 Wiring in Instrument Panels (Boxes, Racks)Chapter 7 Electrical Explosion-Proof and Grounding,
Section 1 Explosion-Proof
Section 2 Grounding·
Chapter 8 Laying of Instrument Pipelines
Section Section 1
General Provisions
Section 2
Laying of Pipelines
Section 3
Section 4
Section 5
Section 6
Chapter 9
Bends and Connections
Fixing of Pipelines
Piping in Instrument Panels (Boxes, Racks)
Pressure Test of Instrument Piping Systems
Section 1
Section 2
Section 3||t t||General Provisions
Degreasing Methods
Chapter 10
Section 1
Isolation and Flushing·
Section 2
Heating and Insulation
Section 3
Chapter 11
Section 1
Section 2
Section 3
Chapter 12
Painting·
Instrument Adjustment
—General Provisions
Monomer Adjustment||t t||System debugging
Project acceptance
Section 1 Trial operation
Section 2 Handover and acceptance
Upstream and downstream of orifice plate, nozzle and venturi tube
Appendix 1
Minimum length of side straight pipe section
Project 2 Construction Standard Full Text Information System
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W. Engineering Construction Standard Full-text Information System
Appendix 2 Formulation and use conditions of alkaline degreasing liquid.....
Appendix 3 Conversion table of legal measurement units and customary measurement units used in this specification
Appendix 4 Explanation of terms used in this specification ·
Additional explanation
Engineering Construction Standard Full Text Information System
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W Engineering Construction Standard Full Text Information System
Chapter I General Provisions
Article 1.0.1 This specification applies to the construction and acceptance of industrial automation instruments (hereinafter referred to as instrument engineering).
Article 1.0.2 The construction of instrument engineering shall be carried out in accordance with the provisions of the design construction drawings and the instrument installation and operating instructions: when there are no provisions in the design, it shall comply with the provisions of this specification; the models, specifications and materials of equipment and materials shall comply with the design provisions; any modification of the design must be approved by the original design department. Article 1.0.3 The construction of instrument engineering shall be coordinated with the construction, electrical and process equipment, pipeline and other disciplines. Article 1.0.Article 4 The construction of electrical equipment, electrical lines, and electrical explosion-proof and grounding projects in instrumentation projects, for parts not specified in this specification, shall comply with the relevant provisions of the current national standard "Electrical Installation Installation Project Construction and Acceptance Specifications". Article 1.0.5 The welding work in instrumentation projects shall comply with the provisions of the current national standard "On-site Equipment, Industrial Pipeline Welding Project Construction and Acceptance Specifications". Article 1.0.6 The purging of the gas supply system, the cleaning of the liquid supply system, the cutting method of the pipe, the processing of the threads and sealing surfaces of the high-pressure pipes connected by threaded flanges, and the connection of the pipelines in the instrumentation projects shall comply with the provisions of the current national standard "Industrial Pipeline Project Construction and Acceptance Specifications".
Article 1.0.7 The equipment and main materials used in instrumentation projects shall comply with the relevant provisions of the current national or ministerial standards. Article 1.0.8 The instrumentation equipment to be installed shall be properly stored according to the required storage conditions, and the main materials used in instrumentation projects shall be stored according to their materials, models and specifications.
Article 1.0.9 Instrument engineering shall meet the following conditions before construction: 1. Design and construction drawings, relevant technical documents and necessary instrument installation and use instructions are complete;
2. Construction drawings have been reviewed;
3. Technical preparations such as technical disclosure and necessary technical training have been completed; 4. The construction site has the construction conditions for instrument engineering. Article 1.0.10 In addition to the implementation of this specification, the construction of instrument engineering shall also be implemented in accordance with the provisions of the current relevant standards and specifications. Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 2 Installation of Source Components
Section 1 General Provisions
Article 2.1.1 The installation of source components shall be carried out at the same time as the manufacturing of process equipment or the prefabrication and installation of process pipelines.
Article 2.1.2 The drilling and welding work for installing the source components must be carried out before the anti-corrosion, lining, purging and pressure testing of the process pipeline or equipment. Article 2.1.3 When drilling holes in high-pressure, alloy steel, and non-ferrous metal process pipelines and equipment, mechanical processing methods should be used. Article 2.1.4 The source components installed on masonry and concrete castings should be buried at the same time as the masonry or casting. When this is not possible, installation holes should be reserved. Article 2.1.5 It is not advisable to drill holes and weld on the welds and their edges when installing the source components.
Article 2.1.6 The source valve should be installed only after it has passed the inspection in accordance with the provisions of the current national standard "Industrial Pipeline Engineering Construction and Acceptance Specifications". Article 2.1.7 The connection between the source valve and the process equipment or pipeline should not use a ferrule joint.
Section 2 Temperature Source Components
Article 2.2.1 The installation location of the temperature source component should be selected in a place where the medium temperature changes sensitively and is representative. It should not be selected near resistance components such as valves, where the medium flow is in a dead angle, or where the vibration is large. Article 2.2.2 The installation location of the thermocouple source component should be away from strong magnetic fields. Article 2.2.3 The installation of the temperature source component on the process pipeline shall comply with the following provisions:
1. When installed vertically with the process pipeline, the axis of the source component should intersect vertically with the axis of the process pipeline.
2. When installed at the bend of the process pipeline, it should be against the flow direction of the medium, and the axis of the source component should coincide with the axis of the process pipeline. 3. When installed obliquely with the process pipeline, it should be against the flow direction of the medium, and the axis of the source component should intersect with the axis of the process pipeline.
Article 2.2.4 Design regulations When the source component needs to be installed on the expansion pipe, the installation of the enlarged pipe shall comply with the provisions on the installation of reducers in the current national standard "Industrial Pipeline Engineering Construction and Acceptance Specifications". Section 3 Pressure Source Components
Article 2.3.1 The installation location of the pressure source component should be selected where the medium flow is stable.
When the pressure source component and the temperature source component are on the same pipe section, Article 2.3.2
, it should be installed on the upstream side of the temperature source component. Article 2.3.3 The end of the pressure source component should not exceed the inner wall of the process equipment or pipeline.
Article 2.3.4 When measuring the pressure of turbid media such as dust, solid particles or sediment, the source component should be installed tilted upward. It is advisable to install it at an acute angle along the flow beam on a horizontal process pipeline.
Article 2.3.5 When measuring the pressure of liquid, steam and condensable gas with a temperature higher than 60°C, the source component of the pressure gauge installed on site shall be equipped with an annular or U-shaped condensation bend.
Article 2.3.6 When the pressure source component is installed on a horizontal or inclined process pipeline, the orientation of the pressure port shall comply with the following provisions: 1. When measuring gas pressure, it shall be in the upper half of the process pipeline. 2. When measuring liquid pressure, it shall be in the lower half of the process pipeline within the range of 0 to 45 degrees with the horizontal center line of the process pipeline. 3. When measuring steam pressure, it shall be in the upper and lower halves of the process pipeline within the range of 0 to 45 degrees with the horizontal center line of the process pipeline. Engineering Construction Standard Full Text Information System
W.bzsoso.cOm Engineering Construction Standard Full Text Information System
Section 4 Flow Source Components
Article 2.4.1 The minimum length of the straight pipe section on the upstream and downstream sides of the orifice plate, nozzle and venturi tube shall comply with the provisions of Appendix 1 of this specification when there is no design requirement. Article 2.4.2 The inner surface of the minimum straight pipe section specified for installing the throttling device shall be clean and free of pits.
Article 2.4.3 When the thermometer is installed on the upstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device shall comply with the following provisions: 1. When the diameter of the thermometer sleeve is less than or equal to 0.03 times the inner diameter of the process pipeline, it shall not be less than 5 (or 3) times the inner diameter of the process pipeline. 2. When the diameter of the thermometer sleeve is between 0.03 and 0.13 times the inner diameter of the process pipeline, it shall not be less than 20 (or 10) times the inner diameter of the process pipeline. Note: When the numbers in brackets are used, the additional limit relative error of the flow rate is ±0.5%. Article 2.4.4 When installing a thermometer on the downstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device should not be less than 5 times the inner diameter of the process pipeline. Article 2.4.5 The installation of the flange used to clamp the throttling device shall comply with the following provisions: 1. After the flange is welded to the process pipeline, the pipe mouth and the flange sealing surface shall be flush. 2. The flange surface shall be perpendicular to the axis of the process pipeline, and the verticality allowable deviation is 1 degree.
3. The flange shall be coaxial with the process pipeline, and the coaxiality allowable deviation shall not exceed the following formula:
t≤0.015D (1/B-1)
Where t is the allowable deviation of coaxiality
D is the inner diameter of the process pipeline
β is the ratio of the inner diameter of the throttling device to the inner diameter of the process pipeline under working conditions 4. When using butt welding flanges, the inner diameter of the flange must be equal to the inner diameter of the process pipeline. Article 2.4.6 When the throttling device is installed on the horizontal and inclined process pipeline, the orientation of the pressure tapping port shall comply with the following provisions: When measuring gas and liquid flow, it shall comply with Article 2.3.6 of this Code and the Engineering Construction Standard Full Text Information SystemArticle 1 The installation of the source components shall be carried out at the same time as the manufacturing of process equipment or the prefabrication and installation of process pipelines.
Article 2.1.2 The drilling and welding work for the installation of the source components must be carried out before the anti-corrosion, lining, purging and pressure testing of the process pipelines or equipment. Article 2.1.3 When drilling holes in process pipelines and equipment of high pressure, alloy steel and non-ferrous metals, mechanical processing methods shall be adopted. Article 2.1.4 The source components installed on masonry and concrete castings shall be buried at the same time as masonry or casting. When this cannot be done, installation holes shall be reserved. Article 2.1.5 It is not advisable to drill holes and weld on the welds and their edges when installing the source components.
Article 2.1.6 The source valve shall be installed only after it has passed the inspection in accordance with the provisions of the current national standard "Industrial Pipeline Engineering Construction and Acceptance Specifications". Article 2.1.7 The connection between the source valve and the process equipment or pipeline should not use a ferrule joint.
Section 2 Temperature Source Components
Article 2.2.1 The installation location of the temperature source component should be selected in a place where the medium temperature changes sensitively and is representative. It should not be selected near resistance components such as valves, where the medium flow is in a dead angle, or where the vibration is large. Article 2.2.2 The installation location of the thermocouple source component should be away from strong magnetic fields. Article 2.2.3 The installation of the temperature source component on the process pipeline shall comply with the following provisions:
1. When installed vertically with the process pipeline, the axis of the source component should intersect vertically with the axis of the process pipeline.
2. When installed at the bend of the process pipeline, it should be against the flow direction of the medium, and the axis of the source component should coincide with the axis of the process pipeline. 3. When installed obliquely with the process pipeline, it should be against the flow direction of the medium, and the axis of the source component should intersect with the axis of the process pipeline.
Article 2.2.4 Design regulations When the source component needs to be installed on the expansion pipe, the installation of the enlarged pipe shall comply with the provisions on the installation of reducers in the current national standard "Industrial Pipeline Engineering Construction and Acceptance Specifications". Section 3 Pressure Source Components
Article 2.3.1 The installation location of the pressure source component should be selected where the medium flow is stable.
When the pressure source component and the temperature source component are on the same pipe section, Article 2.3.2
, it should be installed on the upstream side of the temperature source component. Article 2.3.3 The end of the pressure source component should not exceed the inner wall of the process equipment or pipeline.
Article 2.3.4 When measuring the pressure of turbid media such as dust, solid particles or sediment, the source component should be installed tilted upward. It is advisable to install it at an acute angle along the flow beam on a horizontal process pipeline.
Article 2.3.5 When measuring the pressure of liquid, steam and condensable gas with a temperature higher than 60°C, the source component of the pressure gauge installed on site shall be equipped with an annular or U-shaped condensation bend.
Article 2.3.6 When the pressure source component is installed on a horizontal or inclined process pipeline, the orientation of the pressure port shall comply with the following provisions: 1. When measuring gas pressure, it shall be in the upper half of the process pipeline. 2. When measuring liquid pressure, it shall be in the lower half of the process pipeline within the range of 0 to 45 degrees with the horizontal center line of the process pipeline. 3. When measuring steam pressure, it shall be in the upper and lower halves of the process pipeline within the range of 0 to 45 degrees with the horizontal center line of the process pipeline. Engineering Construction Standard Full Text Information System
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Section 4 Flow Source Components
Article 2.4.1 The minimum length of the straight pipe section on the upstream and downstream sides of the orifice plate, nozzle and venturi tube shall comply with the provisions of Appendix 1 of this specification when there is no design requirement. Article 2.4.2 The inner surface of the minimum straight pipe section specified for installing the throttling device shall be clean and free of pits.
Article 2.4.3 When the thermometer is installed on the upstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device shall comply with the following provisions: 1. When the diameter of the thermometer sleeve is less than or equal to 0.03 times the inner diameter of the process pipeline, it shall not be less than 5 (or 3) times the inner diameter of the process pipeline. 2. When the diameter of the thermometer sleeve is between 0.03 and 0.13 times the inner diameter of the process pipeline, it shall not be less than 20 (or 10) times the inner diameter of the process pipeline. Note: When the numbers in brackets are used, the additional limit relative error of the flow rate is ±0.5%. Article 2.4.4 When installing a thermometer on the downstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device should not be less than 5 times the inner diameter of the process pipeline. Article 2.4.5 The installation of the flange used to clamp the throttling device shall comply with the following provisions: 1. After the flange is welded to the process pipeline, the pipe mouth and the flange sealing surface shall be flush. 2. The flange surface shall be perpendicular to the axis of the process pipeline, and the verticality allowable deviation is 1 degree.
3. The flange shall be coaxial with the process pipeline, and the coaxiality allowable deviation shall not exceed the following formula:
t≤0.015D (1/B-1)
Where t is the allowable deviation of coaxiality
D is the inner diameter of the process pipeline
β is the ratio of the inner diameter of the throttling device to the inner diameter of the process pipeline under working conditions 4. When using butt welding flanges, the inner diameter of the flange must be equal to the inner diameter of the process pipeline. Article 2.4.6 When the throttling device is installed on the horizontal and inclined process pipeline, the orientation of the pressure tapping port shall comply with the following provisions: When measuring gas and liquid flow, it shall comply with Article 2.3.6 of this Code and the Engineering Construction Standard Full Text Information SystemArticle 1 The installation of the source components shall be carried out at the same time as the manufacturing of process equipment or the prefabrication and installation of process pipelines.
Article 2.1.2 The drilling and welding work for the installation of the source components must be carried out before the anti-corrosion, lining, purging and pressure testing of the process pipelines or equipment. Article 2.1.3 When drilling holes in process pipelines and equipment of high pressure, alloy steel and non-ferrous metals, mechanical processing methods shall be adopted. Article 2.1.4 The source components installed on masonry and concrete castings shall be buried at the same time as masonry or casting. When this cannot be done, installation holes shall be reserved. Article 2.1.5 It is not advisable to drill holes and weld on the welds and their edges when installing the source components.
Article 2.1.6 The source valve shall be installed only after it has passed the inspection in accordance with the provisions of the current national standard "Industrial Pipeline Engineering Construction and Acceptance Specifications". Article 2.1.7 The connection between the source valve and the process equipment or pipeline should not use a ferrule joint.
Section 2 Temperature Source Components
Article 2.2.1 The installation location of the temperature source component should be selected in a place where the medium temperature changes sensitively and is representative. It should not be selected near resistance components such as valves, where the medium flow is in a dead angle, or where the vibration is large. Article 2.2.2 The installation location of the thermocouple source component should be away from strong magnetic fields. Article 2.2.3 The installation of the temperature source component on the process pipeline shall comply with the following provisions:
1. When installed vertically with the process pipeline, the axis of the source component should intersect vertically with the axis of the process pipeline.
2. When installed at the bend of the process pipeline, it should be against the flow direction of the medium, and the axis of the source component should coincide with the axis of the process pipeline. 3. When installed obliquely with the process pipeline, it should be against the flow direction of the medium, and the axis of the source component should intersect with the axis of the process pipeline.
Article 2.2.4 Design regulations When the source component needs to be installed on the expansion pipe, the installation of the enlarged pipe shall comply with the provisions on the installation of reducers in the current national standard "Industrial Pipeline Engineering Construction and Acceptance Specifications". Section 3 Pressure Source Components
Article 2.3.1 The installation location of the pressure source component should be selected where the medium flow is stable.
When the pressure source component and the temperature source component are on the same pipe section, Article 2.3.2
, it should be installed on the upstream side of the temperature source component. Article 2.3.3 The end of the pressure source component should not exceed the inner wall of the process equipment or pipeline.
Article 2.3.4 When measuring the pressure of turbid media such as dust, solid particles or sediment, the source component should be installed tilted upward. It is advisable to install it at an acute angle along the flow beam on a horizontal process pipeline.
Article 2.3.5 When measuring the pressure of liquid, steam and condensable gas with a temperature higher than 60°C, the source component of the pressure gauge installed on site shall be equipped with an annular or U-shaped condensation bend.
Article 2.3.6 When the pressure source component is installed on a horizontal or inclined process pipeline, the orientation of the pressure port shall comply with the following provisions: 1. When measuring gas pressure, it shall be in the upper half of the process pipeline. 2. When measuring liquid pressure, it shall be in the lower half of the process pipeline within the range of 0 to 45 degrees with the horizontal center line of the process pipeline. 3. When measuring steam pressure, it shall be in the upper and lower halves of the process pipeline within the range of 0 to 45 degrees with the horizontal center line of the process pipeline. Engineering Construction Standard Full Text Information System
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Section 4 Flow Source Components
Article 2.4.1 The minimum length of the straight pipe section on the upstream and downstream sides of the orifice plate, nozzle and venturi tube shall comply with the provisions of Appendix 1 of this specification when there is no design requirement. Article 2.4.2 The inner surface of the minimum straight pipe section specified for installing the throttling device shall be clean and free of pits.
Article 2.4.3 When the thermometer is installed on the upstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device shall comply with the following provisions: 1. When the diameter of the thermometer sleeve is less than or equal to 0.03 times the inner diameter of the process pipeline, it shall not be less than 5 (or 3) times the inner diameter of the process pipeline. 2. When the diameter of the thermometer sleeve is between 0.03 and 0.13 times the inner diameter of the process pipeline, it shall not be less than 20 (or 10) times the inner diameter of the process pipeline. Note: When the numbers in brackets are used, the additional limit relative error of the flow rate is ±0.5%. Article 2.4.4 When installing a thermometer on the downstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device should not be less than 5 times the inner diameter of the process pipeline. Article 2.4.5 The installation of the flange used to clamp the throttling device shall comply with the following provisions: 1. After the flange is welded to the process pipeline, the pipe mouth and the flange sealing surface shall be flush. 2. The flange surface shall be perpendicular to the axis of the process pipeline, and the verticality allowable deviation is 1 degree.
3. The flange shall be coaxial with the process pipeline, and the coaxiality allowable deviation shall not exceed the following formula:
t≤0.015D (1/B-1)
Where t is the allowable deviation of coaxiality
D is the inner diameter of the process pipeline
β is the ratio of the inner diameter of the throttling device to the inner diameter of the process pipeline under working conditions 4. When using butt welding flanges, the inner diameter of the flange must be equal to the inner diameter of the process pipeline. Article 2.4.6 When the throttling device is installed on the horizontal and inclined process pipeline, the orientation of the pressure tapping port shall comply with the following provisions: When measuring gas and liquid flow, it shall comply with Article 2.3.6 of this Code and the Engineering Construction Standard Full Text Information SystemArticle 2 The inner surface of the minimum straight pipe section specified for installing the throttling device should be clean and free of pits.
Article 2.4.3 When installing a thermometer on the upstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device shall comply with the following provisions: 1. When the diameter of the thermometer sleeve is less than or equal to 0.03 times the inner diameter of the process pipeline, it shall not be less than 5 (or 3) times the inner diameter of the process pipeline. 2. When the diameter of the thermometer sleeve is between 0.03 and 0.13 times the inner diameter of the process pipeline, it shall not be less than 20 (or 10) times the inner diameter of the process pipeline. Note: When the numbers in brackets are used, the additional limit relative error of the flow rate is ±0.5%. Article 2.4.4 When installing a thermometer on the downstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device shall not be less than 5 times the inner diameter of the process pipeline. Article 2.4.5 The installation of the flange used to clamp the throttling device shall comply with the following provisions: 1. After the flange is welded to the process pipeline, the pipe mouth and the flange sealing surface shall be flush. 2. The flange surface should be perpendicular to the axis of the process pipeline, and the allowable deviation of verticality is 1 degree.
3. The flange should be coaxial with the process pipeline, and the allowable deviation of coaxiality shall not exceed the provisions of the following formula:
t≤0.015D (1/B-1)
Where t is the allowable deviation of coaxiality
D is the inner diameter of the process pipeline
β is the ratio of the inner diameter of the throttling device to the inner diameter of the process pipeline under working conditions 4. When using butt-welded flanges, the inner diameter of the flange must be equal to the inner diameter of the process pipeline. Article 2.4.6 When the throttling device is installed on horizontal and inclined process pipelines, the orientation of the pressure tapping shall comply with the following provisions: , When measuring gas and liquid flow, it shall comply with Article 2.3.6 of this specification and the full text information system of engineering construction standardsArticle 2 The inner surface of the minimum straight pipe section specified for installing the throttling device should be clean and free of pits.
Article 2.4.3 When installing a thermometer on the upstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device shall comply with the following provisions: 1. When the diameter of the thermometer sleeve is less than or equal to 0.03 times the inner diameter of the process pipeline, it shall not be less than 5 (or 3) times the inner diameter of the process pipeline. 2. When the diameter of the thermometer sleeve is between 0.03 and 0.13 times the inner diameter of the process pipeline, it shall not be less than 20 (or 10) times the inner diameter of the process pipeline. Note: When the numbers in brackets are used, the additional limit relative error of the flow rate is ±0.5%. Article 2.4.4 When installing a thermometer on the downstream side of the throttling device, the straight pipe distance between the thermometer and the throttling device shall not be less than 5 times the inner diameter of the process pipeline. Article 2.4.5 The installation of the flange used to clamp the throttling device shall comply with the following provisions: 1. After the flange is welded to the process pipeline, the pipe mouth and the flange sealing surface shall be flush. 2. The flange surface should be perpendicular to the axis of the process pipeline, and the allowable deviation of verticality is 1 degree.
3. The flange should be coaxial with the process pipeline, and the allowable deviation of coaxiality shall not exceed the provisions of the following formula:
t≤0.015D (1/B-1)
Where t is the allowable deviation of coaxiality
D is the inner diameter of the process pipeline
β is the ratio of the inner diameter of the throttling device to the inner diameter of the process pipeline under working conditions 4. When using butt-welded flanges, the inner diameter of the flange must be equal to the inner diameter of the process pipeline. Article 2.4.6 When the throttling device is installed on horizontal and inclined process pipelines, the orientation of the pressure tapping shall comply with the following provisions: , When measuring gas and liquid flow, it shall comply with Article 2.3.6 of this specification and the full text information system of engineering construction standards
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