Which Pentair pump for this setup

[mkmkmkmk]

Hi all -

What's the current-recommended Pentair pump for a spa. In the past I used Pentair IntelliFloXF Variable Speed Pump 3HP Max | Rotary Keypad Control | 022055

but now I see:

• This product is obsolete.
• The superceded product was not found.

1) What pump would you use for the spa 10x10 spa with 12 jets and 4-sided negative edge?
2) And what pump would you put for (3) bubblers + (2) magicflow laminars (all ~75' from the equipment)?

And while we're here...
3) What pump for the 20x30 pool with one of the 20' sides being a negative edge into a catch basin?

Thanks

 

[Jimrahbe]

mk,

I don't see that the IntelliFlo XF is obsolete...

IntelliFlo XF

The new IntelliFlo3 is another option.

IntelliFlo3 VSF

Thanks,

Jim R.

 

[JamesW]

022055 is obsolete and superseded by 022056.

IntelliFloXF VSF Pump

Pentair IntelliFloXF VSF Pump - This innovative, variable speed & variable flow pool pump offers precision and savings for large and feature-rich pools.

www.pentair.com

 

[JamesW]

You need to know how much flow you want and how much head loss you have on the suction and return to size a pump properly.

Here are the pump performance curves for the Intelliflo3, the IntelliFloXF and the WhisperFloXF 5.0 HP.

The head loss on the suction has to remain below 17 feet at maximum flow.

What size is the suction?

IntelliFlo3® VSF Pool Pump

The Intelliflo3 VSF pool pump includes auto regulating flow technology, energy savings, and superior performance for crystal clear water.

www.pentair.com

Sell Sheet | IntelliFlo3 VSF Pool Pump

online.flippingbook.com

________________________________________________________________________________________________________________________________________

https://www.pentair.com/content/dam/extranet/nam/pentair-pool/commercial/pumps/intelliflo-xf-vsf/intellifloxfvsf-pump-brochure-english.pdf

________________________________________________________________________________________________________________________________________

WhisperFloXF® VS 5HP Variable Speed Pump

The WhisperFloXF VS 5HP Commercial Pump is the first five-horsepower variable-speed pool pump that runs on single-phase or three-phase power.

www.pentair.com

https://www.pentair.com/content/dam/extranet/nam/pentair-pool/commercial/brochures/pumps/whisperfloxf-vs-pump-brochure.pdf

 

[JamesW]

Pipe Size and Flow Rates.​

You want to keep the water velocity below 6 ft/sec on the suction and below 8 ft/sec on the pressure side of the pump.

That's good practice and probably code, but the absolute limit on the suction is the head loss, which has to be kept below 17 feet to avoid cavitation.

If your equipment is above the pool, that counts as part of the available head loss.

For example, if the pump is 5 feet above the pool water surface, then the absolute limit is 12 feet of dynamic head loss.

If the pump is below the pool water surface, then you can add that to the available head loss.

For example, if the pump is 5 feet below the pool water surface, then you have up to 22 feet available for dynamic head loss, but you need to know the local code, which probably limits the suction to 6 feet per second.

Even if it is not code, you should follow the 6 feet per second rule.

Can I put my equipment about 18' lower than the surface of the pool?

I have a situation in which the most convenient place for the pool & spa equipment is about 18' lower than the surface of the pool. We intend to have 12 jets in the spa, shelf bubblers, deck jets/laminars and an infinity edge/spill way on one side of the pool. Is this possible with Pentair...

www.troublefreepool.com

Pipe Size	6 ft/sec	8 ft/sec
1.5"	38 GPM	51 GPM
2"	63 GPM	84 GPM
2.5	90 GPM	119 GPM
3.0"	138 GPM	184 GPM
4.0"	235 GPM	312 GPM

Equipment Pad Best Practices - Further Reading

www.troublefreepool.com

PVC Pipes Schedule 40 - Friction Loss vs. Water Flow

Water flow in thermoplastic PVC and CPVC pipes Schedule 40 - friction loss <i>(ft/100 ft, psi/100 ft)</i> and flow velocities at dimensions ranging 1/2 to 16 inches.

www.engineeringtoolbox.com

 

[JamesW]

The jets have a flow per jet, so you just multiply the flow per jet by the total number of jets.

For a weir wall, you need to know how much "Lift" you want, which is the height of the water above the weir wall, which is what creates the flow.

What pump would you use for the spa 10x10 spa with 12 jets and 4-sided negative edge?

40 foot at a 1/4" lift would require 4.5 gpm per foot or a total of 180 gpm.

What pump for the 20x30 pool with one of the 20' sides being a negative edge into a catch basin?

20 foot at a 1/4" lift would require 4.5 gpm per foot or a total of 90 gpm.

How well did the old pump work?

What speeds did you run the pump for different applications?

Were you happy with the performance?

Did you ever check the flow rate from the pump keypad while using the pump?

Did the pump cavitate at any speeds?

 

[JamesW]

Do you have separate plumbing for the weirs and jets or are you filtering the water and using the features on the same plumbing?

 

[JamesW]

The amount of “Lift” depends on the effect you want and how level the weir wall is.

For example, if the weir wall is off level by 1/16”, then you have to compensate by adding 1/16” to the lift, which is 0.56 GPM/linear foot.

The effect depends on how much flow you want and how smooth the weir wall is.

Some people might be happy with 1/16” of lift, which is a weak flow, while a different person might want 1/2” of lift, which is a very strong flow.

The system will also limit the flow.

The plumbing has limits and if you are trying to push the water through a filter or a heater, you will also have to consider the limits of those pieces of equipment as well.