What does the symbol in the red circle mean and what does the K in k 01001 stand for
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It is not clear.
Please check the respective P&ID legend.
You will get the details there for each and every symbol used in the P&ID.
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K 01001 seems to be a positive displacement vacuum pump which is used to control the column pressure (by means of a variable frequency drive). Letter K may have been chosen to designate any kind of compressor.
Agree. Dont ask like this. We learn how to look up legend.
Yes. You are right.