HG/T 20519.4-1992 Home Page HG/T20519.4-1992 Standard Download Decompression Password: www.bzxz.net

Home Page Drawing
HG 20519.4-92
Home Page Drawing
HG 20519.4-92
In the process design construction drawing, some of the regulations used in the design are drawn into the home page drawing in the form of diagrams to better understand and use each design document.
The home page drawing includes the following contents:
1 Legends, symbols, equipment position numbers, material codes and pipeline numbers used in pipeline and instrument flow charts. For details, see the relevant design regulations: HG20519.30-92, HG20519.31-92, HG20519.32-92, HG2C519.3592, HG20519.36-92, HG20519.37-92. 2 Codes and numbers of devices and main items.
3 Legends, symbols, codes, etc. of the detection and control systems used in the process of automatic control (instrumentation) specialty. 4 Other matters that need to be explained. www.bzxz.net
The size of the drawing can be determined according to the content and shall not be larger than A1. See the example diagram for details
Screw mouth
Wall outlet bag
Equipment position number
1Equipment category code
2Main item number
3Equipment sequence number in the same type of equipment
4Same equipment suffix
Equipment category code
Compressor, fan
Heat exchanger
Reactor
Main item code and number of synthetic ammonia unit
[Main item name·code
Pipeline and instrument flow
Diagram (PID) sequence number
The first letter of the letter code of the measured variable and instrument function
Measured variable||tt ||Conductivity
Modifier
Ratio (fraction)
Manual (manual trigger)
Moisture or humidity
Pressure or vacuum
Quantity or number of pieces
Radioactivity
Velocity or rate
Subsequent letters
Test point (joint)
Integration and integration
Integration, integration
Record or print
Method of indicating graphic symbols
Measurement point
Graphic number indicating the installation position of the instrument
Installation position
Graphic symbol
Abbreviation of the Chinese characters||tt| |When energy is interrupted
Valve is in the closed position and
When energy is interrupted
Valve is in the original position
When energy is interrupted
Valve is in the open position and
Highest (higher)
Lowest (lower)
Method of indicating the liquid level gauge in glass tube
Nitrogen recovery
Hydrogen recovery
Out-of-boundary pipeline
Code of synthetic ammonia unit: 670
Main item codes of other related units
Out-of-plant pipeline
Thermal power station
Desalted water station
Nitrogen and oxygen station
Circulating water pump room
Sewage treatment station| |tt||Urea plant
Measurement point
Graphic symbol indicating the installation position of instrument
Installation position
Installation of instrument on site
Centralized instrument panel
Installation of instrument
Installation of instrument on site
Graphic symbol
Connection and signal line
Process connection or mechanical connection line
Pneumatic signal line
Electric signal line
Home page diagram
(Example diagram）
Design project
Design stage
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