Plastic (HDPE) Pipework

[WiZardOz]

wondering if anyone has previously had any experience with regards to the interfacing of Plastic Pipework to CS pipework..

It would seem that there is nothing in place within AutoPLANT to deal with the connection of non-matching sizes

for example :

280mm Plastic Stub Flange connection to 250mm CS Flange
630mm Plastic Stub Flange connection to 600mm CS Flange

though others may have come across a solution to this as it would save me a little work in modifying the code

Regards,
Garry

[Cad Monkey]

G'day Gary
We have been going over this issue today (again) the only way we can deal with it is to break the line at the change of size as generally this is due to a material change anyway (and change of line number) and not try and connect the two different sized components so in effect it becomes a natural spec break. We are then going to manually add the connection details on the iso's.
We could do with some way of overiding the connection criteria sometimes for these types of materials with odd sizes and forcing it to join, we can only hope.

[Zortar]

In the C:\Program Files\Bentley\Plant XM\Modules\joints.ebs file you can modify the code to allow different CLASSES or FACINGS to mate up, but I have never found a way to get different SIZES to mate up. Good luck and please share if you find an answer.

[awerning]

The easiest solution is to find a fitting that AutoPLANT already has programmed to handle this kind of transition and then make a spec item to suite. The one that seems to stand out to me (and I have used it for this same purpose before) is the expanding flange component. Like a reducer, you can use it to increase or decrease in size. One end connects to pipe (or what ever end type you specify in the catalog) of what ever size you wish and the other end is flanged what ever size you wish. If you don't like the way AutoPLANT draws it, you can modify the draw script slightly as we did (as we all know that we will never use and expanding flange for its original purpose anyway B) ).

[LenS]

in the past i have used pvc reducer inserts -> to get me down to the correct pipe size and then added a lap joint. the lap joint comes with a backing ring flange. The flange end connection on the lap joint can be modified within your spec to then mate with your CS flange

[awerning]

The major downfall to that method is that you will get 2 components in your BOM. I suppose you can turn one to existing or set your sort code to 100 (if you are sorting your BOM by sort code and have the programming in place to omit components > 99 sort code). Using the expanding flange class will do the same thing in a single component.

[andersun]

I was on an project where the PA modified the plactic speckey.ini file. As I remember he loosen constraints for the flange so that it only looked for a flange OD to make the connection.