Is this 6" sewer pipe "long 90" fitting enough of a sweep? - Woodworking Talk - Woodworkers Forum
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post #1 of 11 Old 04-09-2020, 11:13 PM Thread Starter
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Is this 6" sewer pipe "long 90" fitting enough of a sweep?

Hi everyone. Working out my shop dust collection and planning on buying everything from McMaster-Carr. I'm wondering if I can substitute some of my 90 turns (composed of two 45 fittings) with some of these "long 90 degree elbows" from McMaster Carr? Or will these cause significantly more resistance than two 45 fittings?


McMaster-Carr long 90 degree elbow: https://www.mcmaster.com/9102k116
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post #2 of 11 Old 04-10-2020, 05:21 AM
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I played with this http://www.freecalc.com/fricfram.htm

and tried 2 45's, got 1.07 in pressure drop. then with a 90, got 1.05. Yes, it was water, but air won't be much different.

Bottom line, not worth modifying an existing system, but might as well do it for new work - fewer fittings to buy and install.
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post #3 of 11 Old 04-10-2020, 08:39 AM
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That fitting will be better than two 45s. The 45s are a sharp bend, R/D = 0.5 while that fitting looks like 0.75, so no sharp edge internally like the 45 has.
This site http://www.freecalc.com/ductloss.htm shows a loss coefficient of 0.33 for a 0.75R/D ninety and 0.355 for EACH of the two forty fives at 0.5R/D, so almost twice the pressure loss for the two forty fives compared to the sweep ninety.

-----Dave
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post #4 of 11 Old 04-10-2020, 09:28 AM
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Not easy to find in 6" long sweep ...

However I did find these:
https://www.amazon.com/Charlotte-Pip.../dp/B004TSTDBQ


https://flexpvc.com/cart/agora.cgi?p...n&ppinc=detail


https://www.pvcfittingsonline.com/6-...BoCOgsQAvD_BwE

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 04-10-2020 at 09:34 AM.
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post #5 of 11 Old 04-10-2020, 09:53 AM
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Those are all DWV/Sch40 size. It looks like OP is using Sewer & Drain. The two sizes are not compatible.
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-----Dave
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post #6 of 11 Old 04-10-2020, 10:06 AM
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I knew that but ......

The SDR 35 elbows are all but impossible to find in a long sweep:
https://www.completeplumbingsource.c...xoCFZwQAvD_BwE


You could use the more readily available and cheaper PVC schedule 40 and heat shrink or expand the ends to fit the SDR 35 as shown in these You Tube videos:
https://www.youtube.com/results?sear...nding+PVC+pipe

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 04-10-2020 at 10:36 AM.
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post #7 of 11 Old 04-10-2020, 10:20 AM
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Quote:
Originally Posted by woodnthings View Post
The SDR 35 elbows are all but impossible to find in a long sweep:
https://www.completeplumbingsource.c...xoCFZwQAvD_BwE

Good find!

-----Dave
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post #8 of 11 Old 04-10-2020, 11:28 PM Thread Starter
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oh man thanks everyone! this is great! I am doing a completely new install so I will save a lot by not using all the double 45's! I think I'll just go with woodnthings link to the Complete Plumbing Source site—that is a good find! Not that expensive when you price out two 45's from MacMaster-Carr comparatively.

Last edited by roverson; 04-10-2020 at 11:34 PM.
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post #9 of 11 Old 05-05-2020, 09:27 PM
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Quote:
Originally Posted by woodnthings View Post
The SDR 35 elbows are all but impossible to find in a long sweep:
https://www.completeplumbingsource.c...xoCFZwQAvD_BwE
Good find indeed.
Thanks a bunch.
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post #10 of 11 Old 05-06-2020, 12:18 AM Thread Starter
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Just to report back, I purchased the long sweep 90s today from Complete Plumbing Source and received them today and they fit the ASTM D2729 thin wall 6" pipe I found from a local supplier perfectly.
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post #11 of 11 Old 05-06-2020, 02:57 PM
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Quote:
Originally Posted by roverson View Post
Just to report back, I purchased the long sweep 90s today from Complete Plumbing Source and received them today and they fit the ASTM D2729 thin wall 6" pipe I found from a local supplier perfectly.
Great news.
Thanks for reporting back.
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