Which problem do you have? You can create new kind of pipes and fittings that have higher fisical diameter and in the description indicate that this pipe is Jacketed Pipe. All fittings is nessessary todo with flange ports.
Would be interested to know how this turns out for you.
I had looked at it in the past, but was unable to find a solution that worked. Writing the spec to include both pipe sizes might be the best way to do it.
the jacketing of pipes is a type of insulation, if we take this consideration, and in addition to that, the flanges and fittings are ordered according to their inner diameter, I think it would be advisable to draw the lines in inner diameter and create the jacket as a measure which is the insulation outside diameter. enables the display of insulation, you can see the diameter of the jacket. I'm doing that. greetings!
Every piping design program I've worked with has had problems with jacketed piping. It poses a number of unique problems:
- both inner and outer pipe components must be counted for BOM
- the external line may be insulated and/or have shoes/guides/other supports
- both internal and external runs are coincidental
- the outer run is discontinuous; in other words, it welds to the *back* of the mating flanges
- it should "iso out" with a minimum of user intervention
I've seen a number of different ways of handling this. Some model the internal pipe only and use insulation to simulate the jacket. Some model the jacket and have it count the core piping virtually (good for lots of pre-fab connections). Or the jacket and core can be run in separate models with associated (but not idential) line numbers.
we had to do it. create some pipes that indicate the inner diameter, but are plotted with the outside diameter and use the inside diameter flanges. in the list of materials shows the inner and outer diameter and the insulation is added on the widest diameter. was difficult but we did it!