View this page as YouTube Video Presentation Process Flow Drawing (PFD): A process flow diagram (PFD) is a diagram commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment. The PFD displays the relationship between major equipment of a plant facility and does not show minor details such as piping details and designations.
Process flow diagrams are high levels drawings usually of multiple process systems within a large industrial plant and may be called block flow diagrams or schematic flow diagrams. Piping and Instrumentation Diagram (P&ID): The P&ID shows the interconnection of process equipment and the instrumentation used to control the process. In the process industry, a standard set of symbols is used to prepare P&ID drawings of processes. Piping and Instrumentation Diagram is a diagram in the process industry which shows the piping of the process flow together with the installed equipment and instrumentation.
As a rule Piping and Instrumentation Diagrams do not have a drawing scale and present only the relationship or sequence between components. Just because two pieces of equipment are drawn next to each other does not indicate that in the plant the equipment is even in the same building, Piping and Instrumentation Diagram is just the next part or piece of the system. These drawings only present information on how a system functions, not the actual physical relationships. Because P&IDs provide the most concise format for how a system should function, they are used extensively in the operation, repair, and modification of the plant.
![]() Most inexpensive CAD program like BricksCAD, ProgeCAD, IntelliCAD, Draftsight, CADLogic, ZWCAD or FreeCAD Packages are prepared in such a manner that these can be easily customized. 4 Programs of OpenPipe are such customized programs. The pi program is based on LISP and symbols or blocks are created as and when required and then inserted. Bill of Material is created by a VBA program, which creates a table in MS Excel. In case of valves, the pipe line is cut in that portion. Since blocks are created each time, there is a lot of saving of Disk space. Since the program is written in LISP, Piping and Instrumentation Diagram program can be even modified further. The different pipe lines are arranged on different layers. This is a program where options can be selected through Dialog Boxes. Special Dialogue Boxes are created to make the program more user friendly. To try the program, send a request for trial package. The package is a zip file, pi_trial.zip. There is no setup.exe file as in other packages. Download and unzip pi_trial.zip and copy files in a folder. While running inexpensive CAD program like BricksCAD, ProgeCAD, IntelliCAD, Draftsight, CADLogic, ZWCAD or FreeCAD program, click on tools ->Options (or Preferences) -> Files -> + of Support File Search Path -> Add -> Browse -> Select the folder. The pi_trial.zip file contains pi*.lsp, pi.dcl and pi.slb, pi.dwg (Border drawing). At command prompt type (load "pi.lsp") and press enter. pi program will be loaded. Type pid and press enter. A dialog box will open showing all options of pi. Start selecting options from Dialog Box. ![]() Dialog box to Select Create / Edit / Delete Lines : The lines are arranged on different layers, and the layer name is same as line number. The line number is generally in format : Size-Service-Line Number-Spec. ![]() New Line Number: The existing lines are shown in the list box. We can add new lines to the box by typing in New Line Number and select add. New layer is created, and New Line Number is displayed in list box. ![]() Edit Line Number : To edit an existing line number, we select a line number from list box, enter a new line number and select edit line number. The old number in list box is replaced by new number. ![]() Delete Line Number : To delete an existing line number, we select a line number from list box, and existing Line Number is deleted. ![]() Draw Line : We can draw lines on a particular layer using this option. For this we have to either select a line number from list box, or type in a new line number. Lines will be drawn on that layer. Subsequently when valves and fitting are put in, these are put on this layer. Dialog Box to insert Instruments : We can insert Instruments in the lines. We select an Instrument to be inserted. We are then asked to select where it is to be inserted. ![]() ![]() ![]() ![]() Dialog Box to insert valves : To insert a valve in a line, we select a valve to be inserted. We are then asked to select a line at left insertion point on that line. The line is cut and valve is inserted in the line. Valve is put on the layer of the line. ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Dialog Box to insert Steam Fittings : We can insert Steam Fittings in the drawing. We select a Steam Fittings to be inserted. We are then asked to select a line at left insertion point where Steam Fitting is to be inserted. Steam Fittings is put on the layer of the line. ![]() Dialog Box to insert Pipe Fittings : We can insert Pipe Fittings in the drawing. We select a Pipe Fitting to be inserted. We are then asked to select a line at left insertion point where Pipe Fitting is to be inserted. Pipe Fitting is put on the layer of the line. ![]() Dialog Box to insert Strainers : We can insert strainers in the drawing. We select a strainer to be inserted. We are then asked to select a line at left insertion point where strainer is to be inserted. Strainer is put on the layer of the line. ![]() ![]()
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