Process diagrams PFDs

Process Flow Diagram (PFD) A diagram that shows the material flow from one piece of equipment to the other in a process. It usually provides information about the pressure, temperature, composition, and flow rate of the various streams, heat duties of exchangers, and other such information pertaining to understanding and conceptualizing the process. 

Discuss the main differences between a process flow diagram (PFD) and a process piping and instrument diagram (P ID). 

System description is tlie compilation of tlie process/plant information needed for tlie risk analysis. For e. ample, site locations, environs, weatlier data, process flow diagrams (PFDs), piping an instnmientation diagrams (P IDs), layout drawings, operating and maintenance procedures, technology documentation, process chemistry, and tliermophysical property data may be required. 

Before the HAZOP study is started, detailed information on the process must be available. This includes up-to-date process flow diagrams (PFDs), process and instrumentation diagrams (P IDs), detailed equipment specifications, materials of construction, and mass and energy balances. 

Figure 6.2 shows a detailed process flow diagram (PFD) for a 2 1 array RO system. The figure shows the major components of an RO system including instrumentation, control switches, and valves. 

Figure 6.2 Sample RO process flow diagram (PFD) showing major equipment, valves, and instruments.

Process flow diagrams (PFDs) and material energy balances. 

The process configuration is based on complete process flow diagrams (PFD s) and material and energy balances that show the main recycle streams and control loops. 

This chapter covers the preparation and presentation of the process flowsheet, also known as t) t process flow diagram (PFD). The flowsheet is the key document in process design. It shows the arrangement of the equipment selected to carry out the process, the stream connections, stream flow rates and compositions, and the operating conditions. It is a diagrammatic model of the process. 

PFD The Process Flow Diagram (PFD) shows the basic layout of the unit. A heat and mass balance is included in the flowsheet. Some flowsheets will show the basic control philosophy [851]. 

Complex Refinement Structures. Flowsheets are refined across various hierarchical abstraction levels and depicted in specific representation formats. In the context of the IMPROVE project, we are mainly interested in two of the three commonly used flowsheet variants the abstract flow diagram (AFD) and the process flow diagram (PFD). Thus, the flowsheet editor supports the full hierarchy of complex stepwise refinement operations from AFD to PFD and assures a set of consistency constrains in order to preserve their semantic correctness. 

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