Questions tagged [pi-diagram]
For questions relating to piping & instrumentation diagrams
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Should codes on instruments represent the quantity they measure or the quantity they regulate (P&ID)
Let say you want to make a P&ID diagram of a process in which a level sensor transmits its data to a flow controller. The quantity measured is a tank's level, but the quantity controlled is the ...
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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 ...
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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 &...
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How to draw a pipe being moved between tanks? (ISO standard P&ID)
Where I work, we have a set-up that functionally, works as represented below:
I represented it as such, due to a lack of know-how in regards to the actual, ISO-standardized way of representing this ...
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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&...
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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.
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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 ...
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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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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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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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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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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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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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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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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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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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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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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 ...
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