How high can a jet pump push water?

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Banjo Bud

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I know they can pull water from a maximum of 25’ but after the water gets to the pump, how far can it push it?
 

Marvid

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It would all depend on the strength of the pump. Look at the pump you want and then look at its specs.
 

Reach4

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Push horizontally? Pretty much no fixed limit. There are friction losses with flow, but at low flow, friction losses are low.
http://irrigation.wsu.edu/Content/Calculators/General/Pipeline-Pressure-Loss.php is a simplified calculator to show the effects of friction flow under different conditions.

Push higher in altitude? You lose pressure with rising altitude. So you can climb 2.31 feet for every 1 PSI. Friction and altitude pressure losses add.

Goulds J5SH (High Head) Shallow Well Jet Pump would be a pump with higher than average head(pressure) ability. See the chart on the top of page 3 of https://www.lockewell.com/pdf/goulds/j-series.pdf Note that how far you are pulling up on the suction part affects the pressure available out of the pump.
 

LakeResident

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Pumps need to capable of overcoming a total head. So it all depends! This head would be the suction lift + discharge head + friction losses. So, if you have high suction lift (like 25ft) the discharge head will be lower than it would be at say 10ft suction lift. As total head increases, flow rate decreases. You can see this in the Gould chart Reach4 linked to:
goulds pumps.jpg


The first pump would deliver 8.7 gpm if the discharge head plus friction losses was 20psig. But if discharge head was 50 psig, flow would only be 1.3 gpm. Another way of looking at it - If you need 5gpm and you have 25ft of suction lift, you might get a discharge head of about 40 psi. This is with a very good pump. Typical shallow head pump might give you about 5gm if you have 25ft suction lift and 20psig discharge head (height plus friction losses). Best to avoid high suction lifts if you can!
 
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