Points of emission on P&IDs
Points of emission on P&IDs
(OP)
Is it a standard practice to show all possible points of emission (threaded connections like vents and drains or break flanges) on Piping and Instrument Diagrams? Is this only for hazardous fluids/gases? Has OSHA dictated that these be shown? Thanks for any insight!





RE: Points of emission on P&IDs
All valves should be shown IMO to accurately depict the system. Flanges are not typically shown except at vessel connectons (and then not always) and/or where you have a spectacle blind in the system or something like that. Basically, flanges shown are the exception.
RE: Points of emission on P&IDs
Hope this helps.
saxon
RE: Points of emission on P&IDs
--Mike--
RE: Points of emission on P&IDs
However, different companies have different P&ID standards...
RE: Points of emission on P&IDs
I personally believe that a P&ID should show every valve that gives the operator access to the process, but should not attempt to be a piping drawing. If you must keep track of every connection and joint which might become a point of emission in a piping system, your only recourse is to keep a set of accurate as-built pipe routing and isometric drawings. A 2-D P&ID cannot do a decent job of representing that information anyway, without losing its ability to fulfill its core functions.
RE: Points of emission on P&IDs
This is our method to comply with EPA requirements. The valves are tagged in the field with a unique number and that tag number is also on the P&I-D. This makes it more convenient to locate the actual valve in the field.
ben