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What does SPF mean in a PID flowchart?

2018-08-25View Original

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I saw a flowchart with many SPF×××× entries on it; they aren’t bellows, and they also appear in other symbols. What does this mean?
Reply #22018-08-25
This silencer also has SPF
Reply #32018-08-25
Judging from the location, it seems to be a noise-reducing orifice plate assembly, or maybe a silencer
Reply #42018-08-27
The bellows-like device on the first page also serves another purpose: it acts as a pipeline mixer; But I don’t see any other branches mixing in, do I?
Reply #52018-09-03
Thank you all; the 5th floor might be correct. SPF is probably an abbreviation for Special Part Flange

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