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Plant 3D Isometric Drawings need to show BOP elevations not Center Line
Change the elevation give in the Isometric Drawing to the Bottom of Pipe and here's why. Once again, in the real world of construction, center line elevations are almost useless...besides, it makes designers and engineers look like incompetent amateurs.
The purpose of piping isometrics is primarily for fabrication in a shop. Usually spool drawings are made from the piping isometrics. For fabrication, centerlines are used, not BOP. In 40+ years in piping design I have yet to see dimensioning to BOP on piping isometrics. Perhaps a reference note indicating BOP may be included on an isometric in addition to dimensions to centerlines, but never actual dimensions to BOP.
Spool drawings and isometrics are two different things. Spool drawings are, as you say, intended for shop fabrication. Isometric drawings are intended for field fabrication and erection. Center of Pipe dimensions and Bottom of Pipe dimensions are also two different things. COP is the dimension between changes in direction, horizontal or vertical; as in COP to COP. The label on the Plant 3D ISO drawing should then be "COP" without the plus sign (+), to be technically correct.
Your welcome (I assume you're not being sarcastic). Perhaps you can tell me where I can find a BOP callout for a plan view...seriously. I'm using the 2020 version and in the annotation tab I can find nothing for elevation callout as in Revit. I'm really perplexed, is there anywhere in Plant 3D that will give an actual BOP...as in the dimension from the floor elevation to the bottom quadrant of a pipe run? I found this <> and parts of it are as clear as mud for me.
I would ask for a toggle to give an option of BOP as well as COP.
I would still want COP for those using the isometrics for a design function. i.e. Checking, comparing with equipment nozzle centrelines etc. COP is not used for by those shop fabricating spools. The only non-design use for elevations is for installation - in which case it should be BOP as I continually get told. (BOP on an isometric would also be extremely useful for spotting obvious elevation errors when the primary layout requirement is BOP).
Yes, I could spend all day putting every BOP on orthos. It is not difficult but it still takes time. There is always one missed off at the first issue. The same BOP information is on the Navis model and indirectly from COP on the isometrics if folk bothered to look - but they don't.
