Flow inducer sleeve sizing for 40gph 4" SP

[Evan Byrne]

Hey all, I'm going to be installing a 35S20-8 SP pump and I'm trying to figure out what the appropriate flow inducer sleeve size would be. I see most threads on here people using a thin wall 4" PVC for a 4" pump, but I've also seen some mention of friction loss and larger sleeves for higher flow rates. This SP is going to be running continuously at ~40gph for hours on an irrigation system. Its going to be driven by a Grundfos RSI (solar) and I'd like to minimize friction loss and optimize flow as much as possible.

What size sleeve would you use for a 4" SP pump running 40gph?

 

[Reach4]

solvent weld D2729 sewer pipe: OD 4.215 ID 4.056 ( white or green)
See https://terrylove.com/forums/index.php?threads/flow-inducer-sleeve.95740/ #2

 

[Sponsor]

 

[Valveman]

4" is fine up to 60 gpm. But 5" would also be good at 40 gpm. The smaller the shroud the better for motor cooling.

 

[Reach4]

There also exists 4-1/2 inch PVC well casing. It would be hard to find I think, and would normally be sold in 20 ft lengths.

https://www.jmeagle.com/sites/default/files/jme_WellCasing.pdf

 

[LLigetfa]

4" is fine up to 60 gpm. But 5" would also be good at 40 gpm.

Maybe a typo but the OP said 40 gallons per hour, not per minute.

 

[Bannerman]

OP said 40 gallons per hour, not per minute.

Since the OP said GPH twice, it seems less likely to be a typo.

 

[Reach4]

Since the OP said GPH twice, it seems less likely to be a typo.

Because of the pump selected, I would hope and expect that was a typo...

 

[Bannerman]

I would hope and expect that was a typo...

Agree'd, but without further clarification, we can only go by what was stated.

GPH was also stated in the title of this thread (= 3X).

 

[Valveman]

Not use to seeing GPH, sorry. But that is less than 1 GPM so you need as small a shroud as you can get. Some pumps will not stay cool enough at less than 1 GPM.

 

[LLigetfa]

Because of the pump selected, I would hope and expect that was a typo...

Agreed, probably a typo X3.

 

[Evan Byrne]

Whoops. Yes, typo on the flow rate. I meant to say 40GPM. Gallons per minute. So with a 4" sleeve I shouldn't see any reduction in rated flow?

 

[Valveman]

Yeah, no problem at 40 GPM.