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Forums >> Revit Systems >> Technical Support >> 18" (450mm) storm piping & related fittings
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Joined: Thu, Jan 8, 2009
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Hi, does anyone know how i can draw 18" storm pipes? I tried laying out a stormwater system, but the biggest pipe size in PVC is 12" (300mm). I went to properties, edit, duplicate, and named the new pipe type PVC2, selecting the material as Carbon Steel. Now I was able to select the 450mm pipe, but the fittings would not accomodate (they remained max 300). Hope someone can help! Thanks
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Hi Koolair, My experience Civil Engineer/Engineering contractor that not much in the way of fittings is available in larger pipe sizes. Stormdrains are usually larger than 18" for clogging reasons. Usually the minimum size is 24 these are City and County standards. You can of course create your own fittings, these days in california the tendency is to use prefabricated junction boxes made by Christie and others you can find them on the web. These type of junction boxes are not very efficient as far as maintaining HGL ( pressure momentum ). The best way and a good way particularly if you are going to go to larger piping, is to build junction structures. These structures which can be easily modeled in Revit are basically a large box where a main line enters the upstream end, midway downstream in the box a lateral pipe connection is made generally at 45 degrees not 90, creating a sort of concrete wye. The main line that say inters the junction box as a 24" transitions from 24" to 30" (sweep blend void) keeping the soffit of the pipe following the basic slope, the lateral then transitions from 18" to 27" ( sweep blend void ) at the centerline of the main, These structures will also have a manhole near the down stream end. These are very efficient as far as maintaining pressure and momentum. Some steel fabricated piping is done with welded basically segmented sweeps generally these are very week structurally and cannot be used in any traffic type of conditions. Let me know if this helps
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Joined: Mon, Jul 16, 2007
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well put mbsteve. if you are trying to use the pvc fittings out of the box for a design/coordination solution, they will not work. they are not accurate. i have had to create all the fittings that we need on a project, i have created carbon steel, ductile iron, and pvc just to name a few. another thing that is fundamentally wrong is the inner and outter diameters of the predetermined pipes.
Edited on: Mon, Mar 16, 2009 at 2:24:28 PM
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Hi guys thanks for the tips. Sorry I did post back ealier...I just ended up plugging away at it myself. I was able to work this out. mbsteve, I am working out storm drains inside a building so I don't imagine concrete would apply. eddieboarder, do you have any links or resources where I could learn step by step how to modify plumbing fixtures? I just worked on a gang trap and am having problems..... thanks
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unfortuantely no, kyle b (yoda of revit) has a couple good videos about connectors its the go with the flow series but i would suggest just looking at the fittings that autodesk provides out of the box and mess around with them and the look up tables...also if you went to AU 08 andeken put on a class about creating victaulic elbows and one about a victaulic wye.
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