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Well Pump Capacitie / GPM FAQsJet pump & submersible pump GPM capacity

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Water well pump capacity questions & answers:

Frequently-asked questions and answers about the flow rate, pressure, or pumping capacity of water pumps or well pumps.

This article series compares the pumping capacity in gallons per minute of one line jet pumps, two line jet pumps, submersible pumps, and well pumps of different models and horsepower.

Well Pump Capacity Questions & Answers

These questions and replies were posted originally at WATER PUMP CAPACITIES TYPES RATES GPM

[Click to enlarge any image or table]

(Apr 9, 2014) Awais Qadir said:

I have a centrifugal pump with under mentioned data

Flow = 135 us. gpm, Dynamic Head = 75 ft., Pipe I.D = 6 Inch, Delivery Length = 18000 ft., Bends 4 Nos.

Awais

Calculation of total head and dynamic head or TDH is detailed in the article WATER PUMP CAPACITIES TYPES RATES GPM.

On 2017-02-01 18:04:19.443208 by (mod)

MFA
It's not the pump that generates air in a water system, it's air leaks or improper air volume controls. Your air volume control will, however, need to be capable of handling the GPM and volumes and pump cycles involved.

On 2017-02-01 07:04:28.315364 by MFA

Hi, I have a 20mgd pump and a surge vessel to counter the hammering effect of backflows upon stopping the pump. My question is, will a 20mgd pump generate more air than 10mgd pump?

On 2016-12-05 16:52:53.504138 by Gar

I have a spring located approximately 350 ft below in elevation from my holding tank and approximately 1800 linear feet from this holding tank. How do I calculate the horsepower and flow rate that I need for a pump?

On 2016-10-25 15:25:27.958959 by (mod)

Dianne,

Changing to a slightly more powerful pump won't itself explain having no water, though I include a caveat just blow addressed to Anon.

Please see WATER PRESSURE LOSS DIAGNOSIS & REPAIR at https://InspectAPedia.com/water/Poor_Water_Pressure_Diagnosis.php where we give diagnostic and repair steps for the problem you describe: no water pressure at all. Let me know by comment or email (page bottom CONTACT link) how you make-out and don't hesitate to ask if the information to which I refer you is unclear or seems incomplete.

On 2016-10-25 00:45:51.718056 by Dianne

I had a 3/hp sub well pump. I was given a 1/2 hp sub pump. I changed the Control box an still no water..Help Plzzz.

On 2016-10-24 22:56:57.865508 by (mod)

Anon:

Basically, no that's fine.

But there can be a subtle issue: if the new pump delivers water out of the well at a faster flow rate in GPM then IF the well flow rate is marginal or very modest, the newer, more powerful pump can cause the well to run out of water. That can be managed by adding flow rate controls on the water system.

On 2016-10-24 10:37:08.014598 by Anonymous

There was a 1 horsepower submirsable pump in a drilled well that burnt out. I would like to change it to a 1and 1/2 pump. wold that hurt anything?

On 2016-10-12 22:30:38.256628 by ron

sorry I meant a 25 ft height difference between the house level ( highest fixture ) & the pump ? It's appx. 200 ft. from the house to well in distance. Currently using a 3/4 hp pump 1.25 inlet & 1" outlet.

On 2016-10-12 22:26:25.791699 by ron

I have a shallow well pump rated at 25 ft. lift - is that the same as me using it to pump water 25ft uphill to my house ?

On 2016-09-07 03:03:38.210849 by vikram mody

I would like to develop a 5 H.P. open well centrifugal pump. From where I can get design data for the same like impeller diameter, inlet blade angle, outlet blade angle etc.

On 2016-08-25 15:10:39.950636 by J PRASAD

Open canal system how much 7.5 HP pump delivery discharge in cuces

On 2016-08-23 22:48:02.317796 by (mod)

Almost certainly, Anon. But to be sure, find the pump brand and model and then consult the manufacturer's installation booklet for that pump: you'll usually find a lift capacity that gives the pump's output in GPM at different TOTAL lift heights.

On 2016-08-22 22:49:51.699481 by Anonymous

Putting solar collector on garage roof to heat pool will the 1.5hp pump that came with pool supply the roof is approx 15ft high

On 2016-08-14 19:37:58.397007 by (mod)

Ram:

You need the manufacturer's brand and pump model number to answer your question; you'll see that the pump manufacturer usually includes a pump output flow rate table in GPM for various lift heights.

The lift height isn't only the above-ground distance you cite, it's also got to include the lift distance in the well.

On 2016-08-13 08:42:49.437208 by ram

i have a 3 HP motor which is located at 40foot above the ground and pipe diameter is 40 mm what is the flow rate or water discharge

On 2016-08-03 08:42:09.697092 by joseph l. delos santos

i have a water pump euorostar 3/4 h.p cannot supply water in 2 length pipe no. 1

On 2016-06-30 13:09:59.700661 by lee brittenham

I want to pump 20 gallons per minute and push the water 135 feet in elevation. the system is a lawn sprinkler system and I have a large pressure tank installed at the pump site

On 2016-04-26 16:32:35.039762 by David

I viewed a well report and it states it was tested for 4 hours at 150 feet with a 1 HP and the results were 2.5 Gal Per minute. Does this mean that there is no water or does it mean that a larger HP pump will increase the flow? Logically, if there is water to pump, there is something wrong with the pump, but I have no idea.

On 2015-11-07 02:13:10.707069 by (mod)

The question is more than a pump, Mike. You need to look at the daily water volume usage and the static head in the well too, as well as the total vertical lift. You'll see when you look at the pump capacity tables above that at higher lifts the same horsepower pump will give lower gpm.

Take a look at the table at the end of the article just above: you probably want at least a 2 hp pump.

On 2015-11-07 00:38:15.222146 by mike

Had a well drilled 349 ft deep 8 gpm what pump would you recommend

On 2015-10-19 15:48:17.232781 by (mod)

Motor rpms (revolutions per minute) are standard for most consumer-use electric motors at either 1725 or 3450 RPM.

If you meant GPM (gallons per minute) or LPM (liters per minute) that too is not quite the proper question.

You need to look at the LIFT CAPACITY of the pump in feet - that number will be given by the manufacturer and varies by pump type.

The GPM capacity of a pump will be reduced as the lift height increases.

On 2015-10-19 15:02:08.665330 by Akash

Dear all member here i have question please guide me

i want to fill my water tank which was placed at top of my house 45 feet . water source is at 8 feet depth . so the total distance is 50 feet. i want to lift 1/2 gallon per mint. please guide me how many RPM motor is required to lifting water from basement tank to top tank .. please guide me if any one know about it its my email id ; shaiganrana@yahoo.com whatsapp/wechat/line Number+9234332000901

On 2015-09-26 15:56:13.390708 by (mod)

Sanju

I doubt that anyone, not even a hydraulics engineer, could answer that question without knowing more information such as piping length, diameter, total lift, voltage, pump type and design. However you can get close to an answer by finding the manufacturer of your pump and looking there for their specification of the GPM capacity at various lift heights for your specific pump model.

On 2015-09-26 09:34:54.971560 by sanju

our water pump is 5 hp and well depth is 30 feet so my qution is what is the volume of the discharge per hour

On 2015-09-22 02:25:10.611697 by Anonymous

i need a basement sumerseble pump to pump water to 3 ft hight

On 2015-09-02 21:02:42.424604 by (mod)

In general A one line jet pump can lift (typically) from about 25 feet. For lifting from deeper depths you need a 2-line jet pump set-up.

Some one line jet pumps may be rated with a bit more ift than 25 ft.

On 2015-09-02 20:30:27.196919 by Anonymous

Will this above ground pump pull water out of 40 foot deep well 1-1/2" fresh water, self-priming, 65 gallons per minute, 3.8 horsepower L40AE-D Yanmar diesel engine.
Pump assembly is capable of pumping 65 gallons of water per minute at a 50 foot head
and not more than a 10 foot static suction lift.

On 2015-08-04 16:03:02.960814 by (mod)

I don't know, it's an interesting question. We'll take a look through some submersible pump installation manuals.

If you tell us your pump brand and model we can make the research specific to your case.

On 2015-08-04 12:49:55.240951 by Anonymous

a submersible pump with a 1 1/4 output, can the output be reduced to 1 inch without over working the pump

On 2015-07-24 15:00:20.307339 by (mod)

Jaf

I cannot answer your question as we do not know the well flow rate. The static head in your well, when it has fully recoverd, is about 200 feet. If the well casing is 6-inches in diameter, that's about 600 gallons. So at 100 gpm you could pump water for just 6 minutes before you'd run out. At that point the maximum rate at which you could pump water out of the well would be exactly the well flow rate - the rate at which water flows into the well.

See WELL FLOW TEST for WATER QUANTITY - https://InspectAPedia.com/water/Well_Flow_Test.php

On 2015-07-23 06:41:27.848448 by Jaf

Our water well is 275" deep and the water level sits at 63' presently. We'd like to be able to pump 100 GPM, with a pipe that will be 150' in length. We have no water restrictions on this property. What is your suggestions for the well, pump size.

On 2015-07-18 14:02:50.948769 by steve

can pump rated @ 12 gpm pump more than 12gpm?

On 2015-04-22 04:17:14.337620 by salman jaleel

I am calculating HP of pump for a plant, when i use formula (GPM*H*P/1715*E) it gives 121 HP and when i use formula (Q*H*SG/3960*E) it gives value 5HP, why there is so huge difference????????

On 2015-04-19 15:34:19.673980 by (mod)

Ron you can find a table of pump capacities in the article above - click on the table to see an enlarged, sharper version.

As your pump has to lift 20 meters you'll need either a 2-line jet pump or a submersible pump. For lifting water from a stream I recommend a submersible pump with an inlet foot valve protected by a larger screen-box to avoid clogging. Be sure your pump and water pick-up point are located to minimize picking up debris and surface water, and do not presume that the water is potable.

As you are re-charging a holding tank most likely the flow rate supported by the pump can be modest.

On 2015-04-19 10:04:16.146690 by Ron Channon

I have an extraction licence to take up to 1000 litres of water per day from a continuous flowing stream edging my property. I wish to transfer approximately 100 litres per day (or as required) from this stream and raise it via a submersible pump to a height of 20 meters to fill, and from time to time, top up, a 500 litre holding tank to supply a gravity fed irrigation system.

I intend to install a Hunter ProC 4 zone computerised unit to then irrigate a 4 X 3 meter greenhouse and 3 x (4x3 m) raised beds. The holding tank will be sited two meters above this unit and the total stream to tank 15m pipe run would be approx 30 meters long.
To summarise, what size pump do I require to meet my requirements.
Ron Channon. Mid Devon.UK.

I would be happy to donate £50 to any charity named by the person that can provide me with the specifications etc to enable me to complete this project.

I would be happy to donate £50 to any charity named by the person that can provide me with the answers and required specifications of what is needed to achieve the above.
Ron Channon, Mid Devon, UK. (rc@greenawaycottage.com)

On 2015-03-16 21:12:45.007370 by (mod)

Shawn

On 2015-03-12 16:01:58.317540 by Shawn

I've been reading many of these articles. They are very helpful, however I have a problem and am a bit confused

My water pressure switch is constantly going on and off. So i'm not sure if it is the switch or pressure tank. My pressure gauge reads 40PSI, i think the switch is set to about that and 60PSI cutout. I'm thinking it is my pressure tank, but i will turn off system and then drain water from tank and check to see if tank pressure is around 38psi?

my second question is if i'm replacing the tank (19gallon) I was going to replace with 65 gallon, but then i read all this stuff about right size of pump etc.

My current pump is 1/2hp and well is around 220ft deep. I have 3 bathrooms 2 with shower and tub (1 of which has 2 shower heads) another shower/tub combo.

So i figure i need about 12 GPM? but when i look at some of the detail my 1/2hp pump is probably only capable of 5gpm at 220ft deep?

Question: how do I calculate horsepower requirements for my well pump using depth, pressure, flow rate

Is there a rough calculation for horsepower using depth, pressure, and flow rate? - Zoe 8/8/12

The well pump design engineers who made the reference tables above have both calculated and probably field tested the data shown there. There is a general calculation, but there are so many variables I'd be reluctant to provide nor use it. Examples of variables include

• Pump impeller or pumping assembly design
• Choosing between 120V and 240V
• Duty cycle

Question: My pump can't get above 40 psi - how do I get water to the house?

I have a 3/4 hp Jet pump, New pump, new foot valve, new water lines.

And i can not get more than 40psi to the pump, and once i turn on the valve to the house the pump stops pumping water.

even if i disconnect the line into the house and leave the water free flowing from the pump, i turn on the valve and the water still stops pumping. How do i get water into the house ? - Jose 9/5/12

Jose, I'm not sure I've got a clear idea about this question - but it certainly doesn't sound right that a pump STOPS running when you open a valve feeding water from the pressure tank into the building.

I'm confused about "stops pumping" as you are describing a pump that is not delivering water in all conditions. When does the well pump actually run and under what conditions does it deliver (or not) water?

Question: pump loses all pressure as soon as I open valve to the house

The Pump pulls water from the Well, But as soon as i turn on the valve to the building, the pump seems to loose all pressure and will not pump water out until the valve gets closed then the pressure starts to build in the pump again.

So i guess my question is that as soon as i turn on the valve i loose pressure and can not get any water from them pump. What im i missing to continue getting water after i open the valve to the building ? - Anon 9/10/12

Sorry Anon, I don't understand the question. If the pump is actually working and delivering water at any pressure, I'd expect to see the pressure on the pressure gage at the water pressure tank.

Perhaps you mean you are opening the valve between the water pressure tank and the building water supply piping.

If on opening that valve no water is delivered to the building then perhaps there is another valve closed between tank and building piping; You can confirm that there is actually water under pressure in the water tank by opening the tank drain.

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Or see WATER PUMP REPAIR GUIDE

Or see WATER PUMP, ONE LINE JET

Or see WATER PUMP, SUBMERSIBLE

Or see WATER PUMP, TWO LINE JET

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WATER PUMP CAPACITY & GPM FAQs at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.

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