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pump calc

excel icon  Pump Sizing Calculator
excel icon  City Water Meter Yield Calculator
excel icon  Friction Loss Calculator


pump info


Centrifugal Pumps less than 3 hp



Model Curve Parts Breakdown



Goulds GT
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Berkeley SSHM-2
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Munro LP Series
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Sta-Rite HMSF Jet Pump
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Centrifugal Pumps more than 3 hp



Model Curve Parts Breakdown



Berkeley B1WPS pdf icon
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Berkeley B1-1/2TPLS
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Berkeley B1-1/2TPMS
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Berkeley B1-1/2ZPLS
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Berkeley B2ZPLS
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Berkeley B2-1/2ZPLS pdf icon
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Berkeley B3ZPLS pdf icon
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PTO Pump



Model Curve Parts Breakdown



Kifco Caprari D2-65A
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pump wiring


Typical Centrifugal Pump Setup

This diagram shows how to setup a typical centrifugal pump.  Diagram shows suction piping with foot valve and discharge piping with priming tee. 
pdf icon TPS Diagram

Pump Start Relay
This diagram shows how to wire a pump using a simple pump start relay controlled by an irrigation controller. 
pdf icon  PSR Diagram

Pump Start Relay with Manual On/Off Switch
This diagram shows how to wire a pump using a simple pump start relay controlled by an irrigation controller, but also with the option to turn the pump on manually via a switch. 
pdf icon  TPP-2 Diagram

Pump Start Relay/Pressure Tank Combo (High Head Centrifugal)
This diagram shows how to wire a pump using both a pump start relay and a pressure tank with pressure switch.  This is useful to prevent excessive cycling when using a high head centrifugal pump for irrigation purposes.  This wiring schematic also allows the system to remain pressurized for water on demand applications. 
pdf icon  PSRPT Diagram

Pump Start Relay/Pressure Tank Combo (Submersible Well Pump)
This diagram shows how to wire a pump using both a pump start relay and a pressure tank with pressure switch.  This is useful to prevent excessive cycling when using a submersible well pump for irrigation purposes.  This wiring schematic also allows the system to remain pressurized for water on demand applications. 
pdf icon  PSRPTS Diagram

Single Float Cistern
This diagram shows how to wire a pump in conjunction with a cistern tank using a single float switch and simplex controller.  This setup allows for drainage water to be pumped out of the cistern for the irrigation.  If the cistern is full, the pump will utilize that water first.  Once the tank is emptied, a backup water source (either city water or well water) will then be used by activating a master valve.  This setup ensures the drainage water is utilized first and the cistern is left emptied, able to collect drainage water from future rainfall events.
pdf icon  TPP-1 Diagram

Dual Float Cistern With Autofill
This setup is typically used when the flow rate of the irrigation system exceeds the flow rate of the water source.  In this situation, a cistern or tank is used as a reservoir to supply additional water for the irrigation.  There are two float switches: one is to prevent the irrigation pump from running when the tank is empty, and the other is to turn the fill valve on and off.
pdf icon  TPP Diagram



well pump info

Determining Well Yield with a Pressurized Bladder Tank

The following process describes how to calculate the flow of a well with a pressurized bladder tank to determine how much water it will produce to supply your irrigation system.  This process will measure the performance of the submersible well pump to determine the flow rate and pressure produced.

  A common mistake often made is using the well tag to estimate the performance of the well pump.  Most wells will have a metal tag that gives specific information about the well.  Information contained on the well tag includes the yield of the well, over all depth, casing depth, date drilled, and static water level.  The well yield refers to the amount of water coming into the well.  This does not mean that the well pump is necessarily capable of producing this much water.  It is important to note that the well tag only references the specifics of the well.  It does not include information for the well pump.  The well yield is the maximum amount of incoming water that can be pumped, without over-pumping the well.

The process below will help you determine the flow rate of your pump at a predetermined pressure (45-50 PSI).  It is important to determine the flow rate with this amount of pressure in order for your irrigation system to operate properly.  For larger irrigation systems, it may me necessary to have a higher amount of pressure to operate correctly.  Once you have determined the flow rate at 45-50 PSI, you can then use the Well Calculator to ensure the components you are using will deliver enough pressure to your sprinkler heads.

Equipment Needed

5 Gallon Bucket
100 PSI Pressure Gauge with hose faucet adapter (if not provided at pressure tank)
Stop Watch

Step #1
In this step you will locate any faucets attached to the system.  The number of faucets you will need will depend how much water your well pump can produce.  If your pressure tank is not equipped with a pressure gauge, screw the pressure gauge with an adapter onto a hose faucet. 
 
Step #2
Next turn on a faucet to begin draining down the pressure tank.  As water flows out of the tank, the pressure will begin to fall as well.  Once the pressure tank is drained down low enough, the pressure switch will then turn the well pump on. 

Step #3
Now that the well pump has been turned on, the pressure will begin to increase.  Open the faucet to the point where the pressure gauge holds steady around 45-50 PSI with water running.  Note that if you are not running enough water, the pressure tank may fill up and turn the pump off.  If this happens increase the flow by opening the faucet more or by turning on additional faucets.  Allow time for the pressure tank to drain down enough to turn the pump back on. 

Step #4
Now that the gauge is holding steady around 50 PSI with water running, you will need to collect the water in a 5 gallon bucket to determine the flow rate.  With the water running,  time to see how long it takes (seconds) to fill the five gallon bucket.  If you have multiple faucets running, you will need to repeat this procedure for each one. 

Step #5
Once you have timed how long it takes to fill your 5 gallon bucket, use the following formula to determine the flow rate of the pump:

(60 ÷ number of seconds) X 5 = Gallons per Minute

Important Notes:  If multiple faucets were used, add them together to determine the total flow rate of the pump. 

Step #6
Now that you know how much water your well pump supplies at 50 PSI, use the Well Yield Calculator to help size the  components of your irrigation system to supply the necessary pressure for it to operate properly.   

Ex.  Two faucets were opened to turn the well pump on and maintain 48 PSI on the pressure gauge.  The first faucet fully open filled up a 5 gallon bucket in 40 seconds.   The second faucet partially open filled up a 5 gallon bucket in 60 seconds. 

Faucet #1 (60 ÷ 40 seconds)  x  5= 7.5 gallons per minute
Faucet #2 (60 ÷ 60 seconds x 5 = 1 gallon per minute
Total Flow of the Pump at 48 PSI =8.5 gallons per minute

Determining Well Yield of a Dedicated Pump on a Pump Start Relay

The following process describes how to determine the flow rate of a well pump at a predetermined pressure.  This method will measure the performance of the submersible well pump to determine the flow rate and pressure produced.

A common mistake often made is using the well tag to estimate the performance of the well pump.  Most wells will have a metal tag that gives specific information about the well.  Information contained on the well tag includes the yield of the well, over all depth, casing depth, date drilled, and static water level.  The well yield refers to the amount of water coming into the well.  This does not mean that the well pump is necessarily capable of producing this much water.  It is important to note that the well tag only references the specifics of the well.  It does not include information for the well pump.  The well yield is the maximum amount of incoming water that can be pumped without over-pumping the well.

The process below will help you determine the flow rate of your pump at a predetermined pressure (45-50 PSI).  It is important to determine the flow rate with this amount of pressure in order for your irrigation system to operate properly.  For larger irrigation systems, it may me necessary to have a higher amount of pressure to operate correctly.  Once you have determined the flow rate at 45-50 PSI, you can then use the Well Calculator to ensure the components you are using will deliver enough pressure to your sprinkler heads.

yield testing

Equipment Needed

5 Gallon Bucket
100 PSI Pressure Gauge
Stop Watch
Gate Valves with Fittings

Step #1
Install the gate valve, pressure gauge, and fittings onto the piping coming out of the well.  (See diagram)

Step #2
Fully open the gate valve and turn the pump on.

Step #3
Slowly close the gate valve until the desired pressure is reached on the pressure gauge.

Step#4
Time how long (seconds) it takes to fill the 5 gallon bucket.  Use the following formula to determine the flow rate of the pump:

(60 ÷ number of seconds) X 5 = Gallons per Minute

Step #5
Now that you know how much water your well pump supplies at 45-50 PSI, use the Well Calculator to help size the  components of your irrigation system to supply the necessary pressure for it to operate properly.   

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