Questions tagged [pi-diagram]

For questions relating to piping & instrumentation diagrams

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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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24 views

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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1answer
56 views

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?
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1answer
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What does this P&ID symbol represent?

The symbol: Here is a part of the diagram:
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1answer
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In P&ID, what is the difference in terms of information between pipe and signal line In the diagram?

I got a question. In the P&ID, the pipe will have information such as size, spec, service, insulation size/type and etc. For signal line, is it necessary to have these kind of information? or they ...
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2answers
797 views

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, ...
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1answer
43 views

How to draw orthogonal lines between two points in AutoCad which will be redrawn automatically if the points are shifted?

I was wondering how to do the following in AutoCAD: Suppose we have two snap-points, say one at 0,0 and other at 100,50. I want to draw a line (or a polyline) between these two points such that (a) ...
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0answers
19 views

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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1answer
318 views

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 ...
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0answers
29 views

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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52 views

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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1answer
524 views

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 ...