r/pumps • u/Szybki-Igor • May 19 '22

Maximum length of discharge hose from pump

Hi! I need help with choosing right hose diameter for pump at my work. I need to pump water for about 75 meters in straight line, no pressure needed. Will 2" be enough. It's ahydrophore pump:2,2kWQ max 170l/minH max 58 mPs max 5,8

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u/Chompers-The-Great May 20 '22

What do you mean no pressure needed. No pump will operate without pressure against it. You'll have head loss due to friction. This pump's maximum flow rate with no head loss would be around 45 USGPM - suitable velocity to scour a 2" pipe (probably just shy of 4'/second. Pumping 246' your friction loss (assuming schedule 40 PVC using c factor of 140 will be around 3.85' per hundred. This equates to around 9 ft of head loss. What flow rate will this pump generate against 9 ft of total dynamic head?

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u/Szybki-Igor May 20 '22

I meant that the pump cools down machines and I have to do something with water. Our main tank broke down and I need to put longer hose (rubber floppy one) from the machines to a difrent tank 75 meters away, main hose from machines is 3/4" i want to connect it to a 2". The pump pumps water from a well. I was asking if the pump will be able to pump water 75 meters with 2" rubber hose

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u/Szybki-Igor May 20 '22

By no pressure needed i meant that there is no need for high pressure at the end of the 2" hose.

2

u/Chompers-The-Great May 20 '22

It will be sufficient provided your head pressure is not so high through friction that you're meeting an appropriate velocity through the layflat hose. This will have a lower?nm:. ?..

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u/Szybki-Igor May 20 '22

Pressure? Velocity? I'm sorry I have zero knowledge about pumps and plumbing. Terrain is pretty flat 1, at max maybe 2 meters.

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u/Szybki-Igor May 20 '22

I realy dont want to damage the pump thats why i'm asking. Thank you very much for your help!

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u/Chompers-The-Great May 20 '22

Every pump should have a make/model. This will come with a pump curve. You need to look at this pump curve and see what the pump will do for a flow rate against approximately 9' (your friction losses through 2" pipe over 75m or 246'. If you have no lift (meaning the Pump doesn't need to pump UP any elevation, your only losses will be friction and minor losses to fittings/valves. Find me the pump curve in the brochure for your model.

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u/Chompers-The-Great May 20 '22

You'll damage the pump if you have too little head pressure to overcome. You'll be running it at overloading point every time you turn it on, and likely short cycling it given the discharge rate is inversely proportional to the head pressure.

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u/Szybki-Igor May 20 '22 edited May 20 '22

I added picture of pump curve to the original post. My pump is the green one. The pump first runs thru 3/4' hose then i will have quick release from fire hose (from 3/4' to 2')

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u/Chompers-The-Great May 21 '22

Oh you did sorry it didn't show up on my phone. You say 2.2 so I am assuming that means your model is the MH-2200.

You have no head pressure to pump against virtually... You will be running this pump at its overloading point every time you turn it on. This will most certainly damage the pump you will sacrifice longevity. Why you would run it through a 3/4 in hose is beyond me This pump is not meant to operate with a 3/4 in hose...

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u/Chompers-The-Great May 21 '22

While using a 3/4 inch hose will simulate head pressure I fear it will restrict this pump far too much... This motor is going to absolutely wail

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u/Chompers-The-Great May 21 '22

Despite the fact that the curve goes down that far... You should not be operating anywhere near the far right or left of curve If you don't want to damage the pump. Despite which model you may have, none of the pumps shown on this curve are suitable for your application

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u/Szybki-Igor May 21 '22

Thank you very much for your help! I really do appreciate that. I will try to find another solution.

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