仪表安装技术要求(英文).doc

TECHNICAL SPECIFICATIONS FOR AUTOMATION INSTRUMENT INSTALLATION WORKS
2. TECHNICAL REQUIREMENTS FOR CONSTRUCTION
1.1 Conditions for Instrument Installation
1.1.1 The construction drawings, related technical documents and necessary installation and operation instructions of the instruments are all ready and on hand.
1.1.2 Joint checkup of construction drawings has been made.
2.1.3 Technical preparation such as technical explanation and training has been completed.
2.1.4 The construction site has been made ready for instrumentation works, and construction procedures have been prepared and approved.

2.2 General Specification of Instrument Installation
2.2.1 The instrument installation works must be complied with the construction drawings and the operation instructions of the instruments. The model, specification and quality of the equipment and material must be complied with the Instrument Specifications.
2.2.2 Good cooperation must be made between the instrument construction works and other specialties, such as building, structure, electric, process equipment, piping and so on.
2.2.3 Among the instrument installation works, the installation of power supply equipment, laying of electric lines and construction of electric explosion-proofing and grounding works must be complied with the Code for Construction and Acceptance of Industrial Automation and Instrumentation Engineering (GBJ 93-86) and Standard for Quality Inspection and Assessment of Automation Instrument Installation Works (GBJ131-90).
2.2.4 The welding of the instrument installation works must be complied with CM-QC-TR-009 Code for the Field Welding of Equipment and Industrial Piping.

2.2.5 The purging of the air supply system, cleaning of liquid supply system, cutting method of the pipeline, and processing of high-pressure screw thread and sealing surface for threaded flange connection as well as connection of piping must be complied with the specification in the Code for Construction and Acceptance of Industrial Metallic Piping.
2.3 Installation of Sensing Elements
2.3.1 General Specification
(1) The installation of sensing elements shall be made at the same time as the process equipment manufacturing or prefabrication and installation of process piping.
(2) Opening and welding for sensing element installation must be done before the anti-corrosion, lining, purging and pressure test of process piping or equipment.
(3) Holes/Openings in the high pressure, alloy steel and non-ferrous metal process piping and equipment must be bored with mechanical method.
(4) The sensing elements to be installed on masonry or concrete cast piece must be embedded at the same time when the masonry or casting is being made. If it cannot be done so, the mounting holes shall be reserved.
(5) Opening and welding for installation of the sensing elements is not preferred at or near welding seams.
(6) The sensing elements used in high pressure, negative pressure, high temperature, flammable, explosive, poisonous and noxious media must be all inspected.
(7) The sensing elements used in innoxious media at normal temperature under low and medium pressure must have spot inspection at rate of 30% according to sort of the elements and one piece of each sort shall be inspected as minimum.
2.3.2 Temperature Sensing Element
The technical requirements for construction of the temperature sensing elements shall be complied with the Table 1.
Table 1
Item
Technical Requirements
Material
Conformed to the design requirements
Location
Far away from strong magnetic field, vibration and avoiding fluid dead angle
Vertical installation
Axes of piping and element are perpendicularly crossed.
Installation at the bend of piping
Axes of piping and element are coincident.
Inclined installation
Countercurrent to medium flow
Installation with expanded tube
Conformed to Section 2.2.4 of GBJ93-86
Tightness
No leakage
Pressure resistance
Conformed to Section 8.6 of GBJ93-86

2.3.3 Pressure Sensing Element
The technical requirements for pressure sensing element construction shall be complied with Table 2.
Table 2
Item
Technical Requirements
Material
Conformed to design requirements
Location
Conformed to design requirements
Installation orientation on horizontal and inclined piping
Gas medium
Above horizontal centerline of the piping
Liquid medium
Within 45°corner angle below horizontal centerline of the piping
Steam medium
Within 45°corner angle above or below horizontal centerline of the piping
Installed on piping of turbid media containing dust or sediments
Vertical
Inclined upward
Horizontal
To be an acute angle along the flow direction of the medium at the upper segment of the pipeline
Adjacent to temperature sensing element hole
At the upper stream of the temperature sensing element hole
Sensing element stub extending into the piping or equipment inner wall
Shall not exceed the inner wall
Tightness
No leakage
Pressure resistance
Conformed to Section 8.6 of GBJ93-86

2.3.4 Flow Sensing Element
The technical requirements for the flow sensing element construction shall be complied with the Table 3.
Table 3
Item
Technical Requirements
Check-up before Installation of the Throttling Elements
Material, model and specification
Conformed to the design requirements
Appearance
Clean and smooth
Orientation of orifice plate and carrier tap
In line with“＋” and “－”
Inner ring of carrier (D1)
D≤D1≤1.02D
Deviation of orifice diameter
Conformed to the design requirements
Edge of orifice plate inlet and nozzle outlet
No burr and round angle
Installation of Flow Sensing Elements
Material, model and specification
Conformed to the design requirements
Min. length of the straight run before and after the throttling element
Conformed to the design requirements and ISO-5167 Standard
Distance from the thermometer installed at the upper stream to throttling element
Thermowell diameter of the thermometer≤0.03D
L≥5D
Thermowell diameter of the thermometer between 0.03D and 0.13D
L≥20D
Distance (L1) from the thermometer installed at the downstream to throttling element
L1≥5D
Item
Technical Requirements
Installation of Flow Sensing Elements
Installation of the flange used to clamp the throttling element
Welding of flange with the piping
The nozzle shall be flush with the flange face.
Perpendicularity of the flange face to piping axis
Allowable variation 1°
Coaxiality between flange and the piping
T £ 0.015D (1/B-1)
Inside diameter of the butt welded flanges
D2＝D
Orientation of sensing element on horizontal and inclined piping
Gas medium
Above the horizontal center line of the pipeline
Liquid medium
Within 45°corner angle below the horizontal center line of the pipeline
Steam medium
Within 45°corner angle above the horizontal center line of the pipeline
Flange used
as sensing element
Distance between the axes of the upper and down stream sensing holes and the upper and down stream side end face of the orifice plate (L3)
L3＝25.4±0.8mm
Diameters of the upper and down stream sensing holes
Equal
The axis of sensing hole and the process piping axis
Crossed perpendicularly

2.3.5 Level Measurement Element
The technical requirements for the construction of the level sensing elements shall be complied with the following Table 4.
Table 4
Item
Technical Requirements
Material
Conformed to the design requirements
Location
Conformed to the design requirements
Guiding device of the float level gauge
Vertical and the liquid flow in the guiding device shall be unblocked.
Two-chamber balance container
Position of the container
Vertical
Center point
Coincided with normal liquid level and the allowable deviation being 2 mm
Sing-chamber balance container
Position of the container
Vertical
Elevation
Conformed to the design requirements
Compensation type balance container
Provided with heat expansion prevention device
Connecting pipe between the flange of the fixed float level gauge and the process equipment
Assuring the float to move freely within full range
Tightness
No leakage
Pressure resistance
Conformed to Section 8.6 of GBJ93-86

2.3.6 Composition Sensing Element
The technical requirements for the construction of the composition sensing elements shall be complied with the following Table 5.

Table 5
Item
Technical Requirements
Material
Conformed to the design requirements
Location
Conformed to the design requirements
Orientation of installation on horizontal and inclined piping
Gas medium
Above the horizontal center line of the pipeline
Liquid medium
Within 45°corner angle below the horizontal center line of the pipeline
Steam medium
Within 45°corner angle above and below the horizontal center line of the pipeline
Elevation angle (θ) of the sensing element for gas containing solid or liquid impurity
θ＞15°
Tightness
No leakage
Pressure resistance
Conformed to Section 8.6 of GBJ93-86

2.4 Instrument Panels and Operating Consoles
2.4.1 Formed Steel Base of the Instrument Panel and Operating Console
The technical requirements for the construction of the formed steel bases of the instrument panels and operating consoles shall be complied with the Table 6.
Table 6
Item
Technical Requirements
Fabrication
Material, model and specification
Conformed to the design requirements
Outline dimensions
In line with the panel and operating console
Linearity
Per meter
Allowable deviation 1mm
Total length being more than 5m
Allowable deviation 5mm
Installation
Position
Conformed to the design requirements
Upper surface of the base
Horizontal and higher above the ground
Horizontal obliquity
Per meter
Allowable deviation 1mm
Total length being more than 5m
Allowable deviation 5mm
Installation
Fixation
Firm
Painting
Intact
Grounding
Conformed to the design requirements

2.4.2 Instrument Panel and Operating Console
The technical requirements for the construction of the instrument panels and operating consoles shall be complied with the Table 7.
Table 7
Items
Technical Requirements
Installation
Verticality (per meter)
Allowable deviation 1.5mm
Top elevation difference between two adjacent panels (consoles)
Allowable deviation 2mm
Maximum top elevation difference between the panels (the joints between the panels being more than two)
Allowable deviation 5mm
Flatness of the panels (consoles)
At the joint seam between two adjacent panels (consoles)
Allowable deviation 1mm
At joints (more than 5) between panels
Allowable deviation 5mm
Joint clearance between panels (consoles)
Allowable deviation 2mm
Fixation
Firm
Painting
Intact
Grounding
Conformed to the design requirements
Bolt
Provided with anti-rust layer
Vibration reduction
Conformed to the design requirements
Sealing
Conformed to the design requirements

2.5 Instruments
2.5.1 General Specification
2.5.1.1 The instruments used in high pressure, negative pressure, high temperature, flammable, explosive, poisonous and noxious media must be all inspected.
2.5.1.2 Spot check must be made at rate of 30% for the instruments used for innoxious medium at low- and medium pressure and normal temperature according to their system and services. At least one system or one piece of equipment for one service shall be checked as min.
2.5.2 Temperature Instruments
2.5.2.1 Temperature Measuring Element
The technical requirements for the construction of the temperature-measuring elements shall be complied with the Table 8.
Table 8
Item
Technical Requirements
Installation
Model and specification
Conformed to the design requirements
Item number
Conformed to the design requirements
Position
Conformed to the design requirements or Section 4.1.1 of GB J93-86
Protective measures
Conformed to Section 4.2.1 and 4.1.2 of GBJ 93-86
Material of the gasket
Conformed to the design requirements
Tightness
No leakage
Insertion Depth
In the pipeline
Conformed to the design requirements
In the equipment
Conformed to the design requirements
Wiring
Correct and orderly

2.5.2.2 Temperature Transmitter
The technical requirements for the construction of the temperature transmitters shall be complied with the Table 9.
Table 9
Item
Technical Requirements
Installation
Model and specification
Conformed to the design requirements
Item number
Conformed to the design requirements
Position
Conformed to the design requirements or Section 4.1.1 of GB J93-86
Accessories
Complete
Fixation
Firm and right
Centralized installation
Conformed to the design requirements
Wiring
Model and specification
Conformed to the design requirements
Connection
Correct
Connection of the terminal
Firm and having good conductivity
Lead-in inlet of the terminal box
Shall not face upward and shall be sealed
Sign of the line number
Correct and clear
2.5.3 Pressure Instruments
2.5.3.1 Pressure Gauge
The technical requirements for the construction of the pressure gauges shall be complied with the Table 10.
Table 10
Item
Technical Requirements
Installation
Model and specification
Conformed to the design requirements
Item number
Conformed to the design requirements
Position
Conformed to the design requirements, convenient for operation and maintenance
Sensing joint
Connection
To make the instrument not to bear mechanical stress
Tightness
No leakage
Material of the gasket
Conformed to the design requirements
Fixation
Firm and right
Wiring
Correct
Installation height
For low pressure measurement
Instrument center shall be 1.2 to 1.5 m above the ground.
For high pressure measurement
Instrument center shall be1.8 m above the ground.

2.5.3.2 Pressure Transmitter
The technical requirements for the construction of the pressure transmitters shall be complied with the Table 11.
Table 11
Item
Technical Requirements
Installation
Model and specification
Conformed to the design requirements
Item number
Conformed to the design requirements
Position
Conformed to the design requirements or Section 4.1.1 of GB J93-86
Accessories
All ready and complete
Fixation
Firm and right
Sensing joint
Connection
To make the instrument not to bear mechanical stress
Tightness
No leakage
Centralized installation
Conformed to the design requirements
Installation
Piping connection or wiring
No leakage and correct
Connection of the terminal end
Firm and having good conductivity
Sign of the line number
Correct and clear
2.5.4 Flow Instruments
2.5.4.1 Differential Pressure Transmitter
The technical requirements for the construction of the differential pressure transmitters shall be complied with the Table 12.

Table 12