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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.
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These questions and replies were posted originally at WATER PUMP CAPACITIES TYPES RATES GPM
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(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.
What would be total head. Please mention with any example.
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
On 2017-02-01 07:04:28.315364 by MFAHi, 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 GarI 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,
On 2016-10-25 00:45:51.718056 by DianneI 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:
On 2016-10-24 10:37:08.014598 by AnonymousThere 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 ronsorry 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 ronI 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 modyI 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 PRASADOpen 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 AnonymousPutting 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)
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 rami 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 santosi 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 brittenhamI 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 DavidI 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.
On 2015-11-07 00:38:15.222146 by mikeHad 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.
On 2015-10-19 15:02:08.665330 by AkashDear all member here i have question please guide me
On 2015-09-26 15:56:13.390708 by (mod)Sanju
On 2015-09-26 09:34:54.971560 by sanjuour 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 Anonymousi 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.
On 2015-09-02 20:30:27.196919 by AnonymousWill 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.
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.
On 2015-08-04 12:49:55.240951 by Anonymousa 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
On 2015-07-23 06:41:27.848448 by JafOur 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 stevecan pump rated @ 12 gpm pump more than 12gpm?
On 2015-04-22 04:17:14.337620 by salman jaleelI 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. (email@example.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?
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
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?
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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