"elbow" for duct when modeling a point cloud

[philsogood]

hi

i'm working on plants where I need to create the existing ducts

there are small deviations along the ducts there are no elbow in real life but it would need one to get the true position of the duct

revit doesn't really like small angle for elbow and i would like to know if it's possible to get some special family which would permit to connect ducts together

@iainsavage(bless be him 😉 ) find a very good tip for pipes but what about ducts, there is no "allow slope adjustements" on ducts fittings!

have you any idea/tip?

Phil

[iainsavage]

In real life very small deviations would be created using a mitred offset rather than an elbow.

You would need to create it as a family (unless you can source one - UK library has rectangular and oval ones but not circular). It could be made parametric.

You would need to place the  fitting manually, it won't work in routing options.

[philsogood]

hi Iain

I made a mistake, i'm not talking of deviation but of angle change like on picture below

thanks

[iainsavage]

Same thing in my opinion, just one half of the image that I posted - on site I think they would do that with a customised mitred coupling or very shallow angle mitred elbow.

In Revit terms you would make a family and give it a part type of Offset and place it manually in the project.

I do however wonder if you really do have that change in direction in the building or if its an inaccuracy in the point cloud?

[philsogood]

hi @iainsavage,

no issue with the point cloud. The ducts/pipes are never straight as on a screen

have you a mitred family because i don't know what it is (in English.... and it'll be hard to get a good translation)?

thanks

Phil

[iainsavage]

I don't know how to translate "mitre" but basically they cut the ends of two pieces of duct at an angle (half of the overall change in direction needed at the "elbow") then join them together, so there is no radius just an abrupt change in direction.

I don't have a suitable family but you could probably start with a segmented bend family and modify it

[RSomppi]

I think you're going to drive yourself crazy trying to model these deflections. How are you going to account for the curvature of the earth over long runs? You would be surprised at how short of a length that it actually comes into play. Some deviations change with temperature variances. Revit is not built to account for these.

Unless there are fittings in place that make these small angles, I think it's an exercise in futility.