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Max hose length for a small DC pump

 
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Hi There,

I have a small DC pump (12 V with 2 ampere max current). Its spec says the maximum height it can pump the water is 3 meters (10 feet). The flow rate is 900 liters per hour which is roughly 4 gallons per minute (I tested it and it seems to fulfill its specs). The pump output has a 3/4 inch fitting, which is the hose thickness that I plan to use.

Now, I do not need to lift the water 3 meters from the source (which is a small creek). But I need to water my fruit trees which are distributed in my garden. My question is, how long a 3/4 inch hose with a pump with aforementioned specs can push push the water through assuming that the water needs to be lifted about a meter from the source.

Thanks for any insights.
 
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Great question, I hadn't really thought about accounting for horizontal pipe friction.l ahead of time!
Turns out there are lots of pump capulators out there that take do take that into account.
Heres one:

https://pentairaes.com/pump-calculator
 
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Your 24-watt DC pump sounds like a high volume, low pressure bilge pump. It may possibly move water through a long garden hose but at a ridiculously low rate. As noted above, the elevation gain and pipe friction will kill your throughput.

IMO you need a bigger pump.
 
William Bronson
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If Douglas is right, then the Edible Acres channel has some practical  suggestions on how to use such a pump:
 
pollinator
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One of the reasons I have moved to an air lift pump for some of my needs.

I have replaced many bilge pumps, but my air lift pumps last for many years.     They may not move as much water in a given time but the replacement cost has made up for that for my needs.
 
Douglas Alpenstock
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William Bronson wrote:If Douglas is right, then the Edible Acres channel has some practical  suggestions on how to use such a pump ...


Yes, possibly. We don't have enough details about the pump model, whether it is rated for a continuous duty cycle, and the length of hose required.

One option might be to use the pump to intermittently fill a tank 2 metres immediately uphill , and then use gravity/siphon flow to slowly water the orchard trees.
 
William Bronson
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Mart, do you buy  lift pumps or do you craft your own from aerators, pipe and fittings?
 
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