In a process flow diagram, what does PFD stand for?
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In the flowchart, there is a PID diagram, and along with it there is also a PFD diagram. What does PFD mean? Thank you.
PID has additional controls compared to PFD
My understanding is that a PFD is a process flow diagram that mainly shows the flow of various materials, the material balance, as well as parameters such as pressure and temperature. Through the PFD, it is possible to understand more intuitively that the process PID is a more detailed version of the PFD, with finer details shown for the convenience of construction and operational adjustments. PID and the pipeline valves of field devices are basically the same. In summary, the PFD exists on paper, where it is easy to understand; it cannot be found in the actual field. The PID details are too intricate, making it difficult to gain an overall understanding of the process; yet it remains the detailed blueprint that must be followed for construction and operation
In accordance with GBT 50933-2013 \"Standards for the Preparation of Design Documents for Petrochemical Plants\", the requirements and level of detail for PFDs and PIDs vary at different design stages； PFDs (also known as process flow diagrams) are provided during the process package and preliminary design phases ； Not provided during the detailed design phase ； And PID (Process Piping and Instrumentation Diagram) is required at all three stages: process package design, basic design, and detailed design ； I. Process Package Design Phase 1) The main contents of the PFD should include: process equipment along with their identification names, locations of major process pipelines and special valves, stream identifiers and operating conditions, heat loads of industrial furnaces/heat exchangers, names/operating conditions of utility materials along with their flow rates, as well as the main control and interlock schemes. 2) The main contents of the PID include: process equipment along with their identification names, major process pipelines, pipelines used for starting up and shutting down operations, pipelines of the safety relief system, utility material pipelines and the nominal diameters of valves, material grades and special requirements for special pipelines, safety relief valves, as well as the main control and interlock circuits. II. Basic Design Phase PFD: It should depict the entire production process, including major process equipment and their identification names, major process pipelines, operating conditions, control schemes and stream data, as well as the heat loads of heat exchange equipment; the stream data can be presented in the form of material and heat balance tables ； PID: See the provisions in Standard 5.3.9 for details. III. During the detailed design phase, a PFD is not provided; the PID must be specified in more detail
P&ID: Pipe and Instrumentation Diagram PFD: Process Fluid Diagram