i havent seen any of them around mate, but i suggest making your own 3D cells, especially if you are going to use them frequently.

Unless you wish to spend money I would advise making the one the way you want it.
Regards,
Namdac

Bently Building Mechanical Systems may be benificial, get a hold of your rep., they could get a demo for you.

Also, If you have XM, there are some 3D cells to get you started that come with the program.

Also, if you need more, which, I almost forgot about...
http://oem.cadregister.com/asp/PPOW_Entry.asp?company=10016195&elementID=26487751
The above link has an enormous amount of piping CAD files :)

Hope this helps, the web site will take a while to get what you need, but it doesn't cost a thing.

Check with the Manufacturers that you normally deal with and see if they have any cells that have been done. They might have dwg files just use V8 to open them and save them as a dgn file and set specs...etc. Make your cell library and off you go.
Regards,
Namdac