60 degree pipe elbow

[tmccar]

I have been routing a PVC pipe and it is modelling the 30 and 45 degree elbows fine, but it does the "custom fitting" when I try to route at 60 degrees. I have checked the angle under "segments and sizes" and 60 degrees is checked.

[iainsavage]

Check the lookup table to see if there are entries for a 60 degree option.

In my experience it would be very unusual to be able to purchase a 60 degree elbow commercially so maybe that's why the option is not working?

In reality you would probably use two 30 degree elbows to get 60 degrees.

Upload the family if you need more help.

[tmccar]

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@iainsavage wrote:

Check the lookup table to see if there are entries for a 60 degree option.

In my experience it would be very unusual to be able to purchase a 60 degree elbow commercially so maybe that's why the option is not working?

In reality you would probably use two 30 degree elbows to get 60 degrees.

Upload the family if you need more help.

I edited the elbow family and it looks like the lookup table name is "PVC-U elbow metric"

But I can't find that filename in the Programdata\Autodesk\RVT2022 folder.

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[ToanDN]

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@tmccar wrote:

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I can't find 

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Do a Windows file search.

[iainsavage]

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@tmccar  schrieb:

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I edited the elbow family and it looks like the lookup table name is "PVC-U elbow metric"

But I can't find that filename in the Programdata\Autodesk\RVT2022 folder.

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The lookup table resides inside the family but you can export it.

In the family editor click Family Types then Manage Lookup Tables then Export.

You can then open it in a speadsheet or text editor.

If you get stuck upload the family.

[tmccar]

Can't get it working in PVC pipe so I switched to stainless and that allows me to route at 60  degrees.

[iainsavage]

could you upload the pvc elbow family and maybe someone can fix it for you?

[ToanDN]

What is the pipe for?  I am not a fluid dynamic engineer by any stretch but a 60 degree elbow does not scream efficient flowing to me.

[tmccar]

It's for mains water from a borehole well to a treatment plant.

[tmccar]

Family

[RobDraw]

It's between a 45 and a 90. These are obtuse angles in the flow path, less acute than a 90.

[ToanDN]

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@RobDraw wrote:

It's between a 45 and a 90. These are obtuse angles in the flow path, less acute than a 90.

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Is this considered 60 degree or 30 degree?

[RobDraw]

No. If the red line represents piping, that condition doesn't exist in normal piping.

It's kind if hard to accurately measure an angle between squiggly lines.

Look up 30, 45, 60 degree elbows.

[ToanDN]

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@RobDraw wrote:

No. If the red line represents piping, that condition doesn't exist in normal piping.

Makes sense.

[iainsavage]

There are formulas in the family which appear to restrict the allowable angles to 11.25, 22.5, 45, 90 degrees which is usual for pipe fittings. Interestingly there is not a 30 degree angle which you said you had successfuly created.

In the lookup table (attached) the valid angles are 11.25, 15, 22.5, 30, 45, 90.

So as I said earlier the manufacturer will have restricted the allowable angle values to the fittings which are commercially available.

If you really want a 60 degree elbow then you need to create new lines in the lookup table with 60 degrees as the entry in the column D, but you also then need to have applicable values for the other columns E to P on those 60 degree rows and that data is probably not available from the manufacturer if they don't actually sell that product.

Another option would be to use a generic elbow family in which the geometry is mainly driven by formulas and can flex to any angle.. 

[iainsavage]

It is the angle by which the flow path changes so this would be 60 degrees

Confusingly though some people will refer to a 45 degree elbow as a 135 degree!