[introduction] if you see in a variety of flow chart of a blank, don't know all the unknown of odd shape with finger, then this will bring you a sign to learn, what they really mean, what are the broad and profound meaning.

Chemical process flow chart
1, process flow chart (PFD)
2, public material flow diagram (UFD)
3, process piping and instrument flow chart (PID, UID)
Two, the valve
1, common valve symbol













2, common valve legend


Three, pipe fittings
Common tube symbols









Four, pipeline
Common pipeline legend


Five, equipment
1, all series of the number of equipment (including spare equipment), equipment number and name, if necessary, to indicate its main specifications
2, complete sets of supply of the plant's initial supply range
3, all equipment nozzle
4, non - type equipment within the parts should be appropriate, such as plate form, with the import and export of the tower plate serial number, baffle plate, mist, heating or cooling coil, etc.
5, if there are process requirements, should be noted that the installation height of the equipment and the relative height between the equipment
6, pump, compressor, blower and other rotating equipment drive type
1, common small equipment legend


2, common equipment symbols








Six, instrument
1, all online instruments, including measurement, recording, adjustment, analysis, and so on, all instruments are required number
2, all regulating valve
3, interlocking relationship
4, random instruments should be indicated on the PID
The common instrument of legend