Questions tagged [pi-diagram]

For questions relating to piping & instrumentation diagrams

6 questions with no upvoted or accepted answers
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How to identify a P&ID diagram symbol used by more than one control loop

I know that a P&ID symbol has a loop number. For instance in the image below the number is 0134. In case an instrumentation is used by more than one control loop (so I need to write more than one ...
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Custom Models in Process Engineering

I'm using Aspen Custom Modeler to create a model to be used in Aspen Plus and Aspen Plus Dynamics, and I'm having trouble figuring out how to code the mass balance, energy balance, etc. I'm ...
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Proper designator for a torque guard in a P&ID

What's the proper first letter designator for a torque guard in a DIN or ISO compliant P&ID? I find fist-letter designators for a few physical values (L for level, S for speed etc.) but none for ...
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Aligning objects to each other in AutoCad

I have two symbolic valves I would like to align in Autocad 2021 (a threeway valve on top and normal valve underneath). I am trying to create a line between the midpoint of both valves. But if the ...
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Atmospheric Break

I'm working on a P&ID drawing and need to add a symbol for an "Atmospheric Break". Is there a symbol for this that I can use to represent this? Thanks in advance.
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Custom User Models in Aspen Plus

I'm trying to simulate a purifier in Aspen Plus in a cryogenic system. This purifier is just meant to change the pressure of the outlet stream based on the inlet flow and pressure (we are using the ...