Piping elbow using special angle - Inventor Forum

 

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Your drawing asks for a slope of 1/100 which is ~0.573... deg roughly, positive or negative of 90deg; this is quite common in Pharmaceutical gravity draining lines. 

 

ASME BPE clasifies this as

GSD2 - 1in/8ft - 10mm/1m - minimum slope 1% - minimum slope deg 0.57deg

 

I had that in a couple of projects and sadly Inventor can't be used for this. I have authored both my obtuse acute elbows to content center but unfortunately you can only use one with self draining lines.

 

Your whole run needs to slope in a single direction... which is not always the case. Some lines are so long that you need to have a maximum point somewhere in the middle rather than at one end. The Tube and Pipe Style window only allows you to select a single elbow be that obtuse or acute.

 

What I have ended up doing is running everything in tubing with bends, which allows custom angle routing.

 

This is Idea 102 on Tube and Pipe overhaul (to be posted when time permits)

 

102. Allow self draining lines with 2 slope directions. In the T&P style dialog when you tick the Self Draining box you are allowed to select a custom elbow which is either larger or smaller than 90deg. We should be allowed to choose the complement angle elbow as well. On long runs we tend to create a high point in the middle of the run and have them falling in both directions. For example on a self draining route from a pump to a storage vessel we create a high point in the middle and first section falls back to the pump while second falls towards the vessel.

 

 

Not sure how the next will help you but I'll throw it out there for anyone interested.

 

Tubing with bends has brought another set of problems because I needed insulated pipes in 1" and 2" wall thickness and sweep tube segments don't follow the pipe template but the pipe ID OD and sweep path get created automatically each time you change, modify the route.

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I could have created a CC family where the OD of the pipe is the OD of the insulation but any branch fittings, clamps and instruments would stick to the outside face of the insulation rather than the pipe; another bug / limitation / improvement opportunity.

 

For this I decided to just add the insulation as a separate feature and while this works great in "Rigid Pipe with Fittings" (image bellow) it doesn't play well on "Tubing with Bends".

 

 

The sketch on sweep segment has no constraints, no dimensions and the OD ID circles are created based om T&P style dimensions (my guess) rather than part parameters.

 

If you change OD parameter in the part and you then modify the route (force update the sweep segment) the pipe segment doesn't change OD.

 

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Adrian S.

Postby Teapot1 » Thu 14 Oct, 08:12

Brandotheplumber wrote:The first thing I think about is that the eyeball on the end of the jet reduces down to 1/2&#; so why should I worry?
In the end I agree with czeckmate. The use of fittings are important force bending pipe makes cracks. Less fittings the best 2 45&#;s no way.

Your first point is of course correct in that the stupid pool industry generally hasnt a clue. My sytems and installs balance (enlarge ) the return fitting holes to equal the cross sectional area of the pipe divided by the number of returns obviously. However with powerful pumps this would almost certainly lead to cavitation at the pump so another good reason to use a variable speed pump. Standard setups with 1/2" holes just creates more dynamic head and larger electricity bills.

Depending on the system 2 x 45's can often produce higher flow due to less resistance as seldom are there just one 90 bend so they all add up. As you reduce the speed and power of the pump the flow becomes more important so long radius bends and 2x 45's are relevant.
The biggest loss is still the filter, manufacturers overstate the flow you are likely to get by x2 to try and outsell the competition, I know this from flow testing actual figures from pools I have worked on, its the first test I do.
Gluing joints, do it right and no leaks, these are low pressure open systems.

Your first point is of course correct in that the stupid pool industry generally hasnt a clue. My sytems and installs balance (enlarge ) the return fitting holes to equal the cross sectional area of the pipe divided by the number of returns obviously. However with powerful pumps this would almost certainly lead to cavitation at the pump so another good reason to use a variable speed pump. Standard setups with 1/2" holes just creates more dynamic head and larger electricity bills.Depending on the system 2 x 45's can often produce higher flow due to less resistance as seldom are there just one 90 bend so they all add up. As you reduce the speed and power of the pump the flow becomes more important so long radius bends and 2x 45's are relevant.The biggest loss is still the filter, manufacturers overstate the flow you are likely to get by x2 to try and outsell the competition, I know this from flow testing actual figures from pools I have worked on, its the first test I do.Gluing joints, do it right and no leaks, these are low pressure open systems.

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