Process Flow Diagram (PFD)
1.Purpose of PFD
a.Scope of process
-Identify the scope of the plant to be constructed.
b.Plant design basis
-Identify the design basis by indicating process flows from feed to products and by-products.
c.Identify equipment configuration.
-Identify the process control scheme
2.Information Indicated on PFD
a.Equipment:
-Shape
-Item Number and Service Name
-Main dimensions and capacity
b.Stream Lines:
-Main Process Lines with stream number,
-Secondary Process Lines and
-Main Utility Lines with related equipment
c.Instrumentation:
-Control system with Control Valves
-Important Instruments
d.Operating Conditions around major equipment
e.Stream data for main process lines:
-Stream Number
-Stream Description
-Molar or weight flow rate of individual components
-Composition of flowing fluid
-Total flow rate (Molar or Weight)
-Molecular Weight
-Density
-Liquid Fraction
-Operating Pressure
-Operating Temperature
f.Process Variables to be Controlled
-Pressure
-Flow
-Temperature
-Level