1.0.1 This Guide is prepared to obtain accurate control survey to meet the requirements for instrument maintenance and easy operation, and to correctly determine the erection position of instrument.
1.0.2 This Guide is used to instruct the instrumentation designing personnel to prepare the requirements for the construction and erection of instrument for project items，or to instruct the designing personnel to select or supplement the requirements of the construction and erection of instrument (general) in Appendix A of this provision, to form the requirements for construction and erection of instrument for project items.
1.0.3 The implementation of this Guide shall also meet the requirements of current relevant standards of the nation.
1 General
2 Contents of Requirements for Instrumentation Construction and Erection
2.1 General requirements
2.2 Control room and instrument panel
2.3 Alarming and interlocking system
2.4 Flow
2.5 Liquid level instrument
2.6 Pressure and differential pressure instrument
2.7 Thermometric instrument
2.8 Analysis meter
2.9 Special instrument
2.10 Control valve
2.11 Power supply and air supply
2.12 Cable and pneumatic signal pipeline
2.13 Heat insulation and heat tracing
3 Preparation Requirements of Requirements for Instrumentation Construction and Erection
Appendix A Requirements for Instrumentation Construction and Erection(versatile)
A.1 General Description
A.2 Control room and instrument panel
A.3 Alarming and interlocking system
A.4 Flow
A.5 Level instrument
A.6 Pressure and differential pressure instrument
A.7 Thermometric instrument
A.8 Analyzer
A.9 Special equipments
A.10 Control valve
A.1l Power supply and air supply
A.12 Cable and pneumatic signal pipe line
A.13 Heat insulation and heat tracing
Appendix B Accessing Mode of Instrument
1.0.1 This Guide is prepared to obtain accurate control survey to meet the requirements for instrument maintenance and easy operation, and to correctly determine the erection position of instrument.
1.0.2 This Guide is used to instruct the instrumentation designing personnel to prepare the requirements for the construction and erection of instrument for project items，or to instruct the designing personnel to select or supplement the requirements of the construction and erection of instrument (general) in Appendix A of this provision, to form the requirements for construction and erection of instrument for project items.
1.0.3 The implementation of this Guide shall also meet the requirements of current relevant standards of the nation.
Contents of HG/T 20637.4-1998
1 General
2 Contents of Requirements for Instrumentation Construction and Erection
2.1 General requirements
2.2 Control room and instrument panel
2.3 Alarming and interlocking system
2.4 Flow
2.5 Liquid level instrument
2.6 Pressure and differential pressure instrument
2.7 Thermometric instrument
2.8 Analysis meter
2.9 Special instrument
2.10 Control valve
2.11 Power supply and air supply
2.12 Cable and pneumatic signal pipeline
2.13 Heat insulation and heat tracing
3 Preparation Requirements of Requirements for Instrumentation Construction and Erection
Appendix A Requirements for Instrumentation Construction and Erection(versatile)
A.1 General Description
A.2 Control room and instrument panel
A.3 Alarming and interlocking system
A.4 Flow
A.5 Level instrument
A.6 Pressure and differential pressure instrument
A.7 Thermometric instrument
A.8 Analyzer
A.9 Special equipments
A.10 Control valve
A.1l Power supply and air supply
A.12 Cable and pneumatic signal pipe line
A.13 Heat insulation and heat tracing
Appendix B Accessing Mode of Instrument
