Noise levels PMSM vs TEFC vs ODP

[JamesW]

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[phillip123]

Note: Assumes 2.5" lines with an Equivalent Length of 100 feet and the pump is at the same elevation as the pool.

You have to subtract the height of the pump inlet to the pool water surface in the trough while operating.

If the Pump inlet is 5 feet above the water in the trough, then you only have about 12 feet of suction to work with.

That limits the flow to about 140 gpm, 6.67 gpm/ft, about 5/16" lift.

Thank you very much for all the information! I really appreciate it!

Just a very quick update with some measurements. More to come later today.

The pool is approximately 35ft. x 15ft. The negative edge pump is southeast of the pool and trough, about 15ft. south and 20ft. east of the nearest corner of the pool.

The pump is situated down a hill, below the level of the pool, and it appears possibly even below the level of the trough. At best, I would judge the pump is at the same elevation as the very bottom of the trough.

 

[JamesW]

Ok, you can probably do a 3.45 hp motor that is single speed in TEFC or ODP.

Verify with Pentair if 3.45 hp is enough.

Maybe consider the 5 HP WhisperFlo XF VS if you want more power or a quieter pump.

 

[JamesW]

y = 0.0912(X)^0.669

y = 0.0912(X)^0.669, y from 0 to 2 - Wolfram|Alpha

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X is gpm/ft, y is lift in inches
0, 0
0.56, 0.0625.
1.59, 0.125
2.92, 0.1875
4.5, 0.250
6.28, 0.3125
8.26, 0.375
10.4, 0.4375
12.7, 0.5
15.2, 0.5625
17.8, 0.625
20.5, 0.6875
23.3, 0.75
26.3, 0.8125
29.4, 0.875
32.6, 0.9375
35.9, 1.0
101, 2

 

[JamesW]

The water feature in question is a 21ft. long negative edge.

Total Flow in GPM = Y-axis.

Lift required = X-axis.

Flow in GPM = 21 (Lift/0.0917)^1.499.

For example, a lift of 0.3" requires = 21 (.3/0.0917)^1.499 = 124 GPM.

x = 21 (y/0.0917)^1.499, y from 0 to 0.5 - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

www.wolframalpha.com

x = 21 (y/0.0917)^1.499, y from 0 to 0.5 - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

www.wolframalpha.com

 

[JamesW]

y = 0.0917(X/21)^0.667, y from 0 to 0.5 - Wolfram|Alpha

Wolfram|Alpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.

www.wolframalpha.com

 

[JamesW]

Here is a Weir Flow Calculator allowing the input of Total Flow, Lift and Weir Wall Length.

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