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Questions tagged [pi-diagram]

For questions relating to piping & instrumentation diagrams

19 questions
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What makes a good piping and instrumentation diagram tool?

A while back, I asked this question for a free Piping and Instrumentation Diagram (P&ID) software on softwarerecs.SE. I described the core features of a P&ID software thusly: Where a proper P&ID software differs from a drawing tool like Visio or…
mart
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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 force or torque. As of now I'd use WS+ (W for weight,…
mart
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Where to find a complete overview for ISO P&ID standards?

I have tons of questions in regard to what is, and isn't, in accordance with ISO standards when drawing P&IDs. So, I'm looking for a resource which gives a complete overview of the standards. Meta: I realize this question may veer towards being…
user110391
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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 number), how can I identify the instrumentation?…
GibbOne
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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 essentially coding up a pump, but a pump which takes both…
Adam Tidball
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Is seal water/lubriaction oil for equiptment shown in P&IDs? If so, how to show it? (ISO)

Given the sheer amount of pumps, adding seal water lines would complicate things a lot. One alternative would be to draw the lines coming the pump that pumps the seal water, and just symbolize them "phasing out" of the drawing, and then drawing the…
user110391
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ISO standards for drawing reserve equiptment in P&IDs

Let's say you have two pumps, one always running and the other in reserve. Maybe they're switched regularly, or maybe the other is only used when the first is broken/down for maintenance. In a P&ID, drawn after ISO standards, will the reserve…
user110391
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Piping and Instrumentation diagram symbols for Position valves and HPLC pumps

I'm looking for advice on how to depict the HPLC pump on the P&I Diagram. What is the symbol (or combination of symbols) to indicate that it has 4 switchable inputs and one combined output with the built-in high-pressure pump? (+ in-situ flow…
Araneus0390
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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 valve symbols aren't exactly in line you get a line…
user408041
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Does P&ID have cross-reference same as electrical drawing?

In electrical i usually use cross-references to identify their symbols locations, I am still yet a lot to discover P&ID. So my question is, does P&ID have this such of thing?
Sahil Syazwan
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What does this P&ID symbol represent?

The symbol: Here is a part of the diagram:
storgt2
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Identification a Symbol for P&ID's Standards

i have a question regarding on PID standards ISO 14617. Below is the attached symbol graphic, i seem cannot find anywhere what actually this symbol refer to from standards that i have looked up; PIP, ISO, DIN and BS. I would appreciate if anyone…
Sahil Syazwan
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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.
Laurie B.
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Temperature measurement in a process pipe

I am going through a PID in which the line size was increased from 2 inch to 4 inch for temperature measurement and then decreased to 2 inch using two reduces. What is the need for reducers before temperature measurement?
Navinmm
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Differences in these ISO standards for P&ID drawing

I'm trying to draw a P&ID of my workplace's process, in accordance with ISO standards. In my search for the relevant standards, I have found a few that seem relevant to this. I am not sure exactly which of them are essential for P&ID drawing, and…
user110391
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