It may be preferrable to elaborate piping drawings first (isometrics & arrangements), then do piping counts. I think this practice would be confusing today for a small refinery Project, due to plurality of pipes and racks.
Maintenance Dept measured, cut, and installed piping on field, connecting equipment as needed. No isometrics were used (most probably there were not).
In a fertilizer factory new piping was approximately estimated from plot plans, when we had to install a gas cleaning system (1980). If it is a simple modification involving only one P&ID, things may be simpler. Orders are usually placed after every substantial Revision, since piping is a critical item in the majority of Projects.Ībove concerns information from a rather big Petrochemical Project (1981). This may represent only (say) 75% of total piping (of final Revision), since a lot of drains, vents, expansion joints, new utility pipes, are added (by Piping or Other Disciplines). thermal liquid expansion valves, blinds, etc) are concentrated in a list of piping material take off, Revision 0. Pipe count (α meters of 3" pipe of class ABCD, β meters of 4" pipe of class CDFD, etc), valve count, count of rest piping elements (e.g. They usually visit the field for clarifications. Mentioned isometric / piping arrangement drawings are elaborated by piping designers / draftsmen, after having looked into P&ID, layout and existing piping drawings. Isometric or piping arrangement drawings are needed for "piping material take off" (revised at least three times during project implementation). You can do the "line list" based on it (you have to know elevation differences too), but you cannot estimate the length of each pipe. thanksP&ID is not drawn under scale, neither does it show pipe elevations or downs it is just a shematic diagram showing all lines. Hi all I wanted to know if it is possible to calculate volume of piping from P&ID alone? any ideas. Expecting suggestions, the lesson is "ask clarifications before".
Probably I have to erase this post, or leave it to indicate results of misunderstanding! Even though post gives some info on piping design, the matter below is not related to the query, which has been written in a clear form now. Oohps! My understanding on the matter was originally quite different, since "volume" can have the meaning of quantity (at least in my thought), so "volume of piping " was considered by me as piping material take off.
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