Jandy sweep elbow?

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T

Tapio

0
Aug 17, 2015
18
San Diego, CA
Of the many things I found while planning my pump install was the Jandy sweep elbow designed to provide less hydraulic friction in an elbow. I liked the idea first but when I realized they recommend a transition cement (ABC-PVC) for it I lost interest. This sweep elbow must be made of ABS (or CPVC I read elsewhere). I rather keep everything to good old PVC.

Anyway what do you guys think of this elbow?
 
Tapio said:
Of the many things I found while planning my pump install was the Jandy sweep elbow designed to provide less hydraulic friction in an elbow. I liked the idea first but when I realized they recommend a transition cement (ABC-PVC) for it I lost interest. This sweep elbow must be made of ABS (or CPVC I read elsewhere). I rather keep everything to good old PVC.

Anyway what do you guys think of this elbow?
Click to expand...
Why not just use a regular SCH40 PVC Sweep?
http://www.usplastic.com/catalog/item.aspx?itemid=97739&catid=726

Dom
 
You could use sweeps but they are not commonly available in the 2" or 2.5" size unless you order online and they are 2x the cost of a regular elbow. I don't think it is necessary to worry about the extra loss associated with regular elbows as most people likely have somewhat oversized pumps for their pools in general. You might consider two 45s in place of a single 90.
 
Mas985 is our hydraulics guy but he will confirm that the friction loss in a regular 90 is small enough not to pay it any attention. In short, use standard 90's.........the head loss is almost inconsequential.
 
I believe I read about the sweep elbow requirement on page 144, Section (p), item 2, line C in the California 2008 Building Energy Efficiency Standards for Residential and Nonresidential Buildings, available at http://www.energy.ca.gov/2008publications/CEC-400-2008-001/CEC-400-2008-001-CMF.PDF


System piping.
A. A length of straight pipe that is greater than or equal to at least 4 pipe diameters shall be installed before the
pump; and
B. Pool piping shall be sized so that the velocity of the water at maximum flow for auxiliary pool loads does not
exceed 8 feet per second in the return line and 6 feet per second in the suction line; and
C. All elbows shall be sweep elbows or elbow-type that have a pressure drop of less than the pressure drop of
straight pipe with a length of 30 pipe diameters.




 
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