These drawings only present information on how a system functions, not the actual physical relationships. 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 it is just the next part or piece of the system. P&IDs are usually designed to present functional information about a system or component.Įxamples are piping layout, flowpaths, pumps, valves, instruments, signal modifiers, and controllers, as illustrated in Figure 6.Īs a rule P&IDs do not have a drawing scale and present only the relationship or sequence between components.
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