Two of the most important drawing documents in this stage are…
A Process Flow Diagram (PFD), shows all equipment in the process scheme like pumps, compressors, heater, reactors, distillation column that are required for processing, and links them up in the form of a flow diagram showing materials flow and heat flow through each of the equipment.
The other most important drawing is Piping and Instrumentation Diagrams (P&ID) showing all interconnecting pipe sizes, pipe specifications, control system and control instrument specifications. It also gives major equipment sizes and performance specification.
In earlier days, P&IDs were being conceived and drafted total manually. Now P&ID software provide the capability to built schematics intelligently, performing design checks for consistency and compatibility of components. Once the process simulation is done, the actual drafting works are carried out by software programs like AutoCAD.
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