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Sizing Pump

Well diameter should be determined as per the pump size, it should not be the other way around

To size a well pump there are two main things which needs to be considered i.e. your required flow rate and your required amount of lift

Flow rate: it is the volume of fluid travelled in unit time (usually measured in LPM or GPM or m3/h) Lift: amount of lift can also be determined as total dynamic head (usually measured in mtr. Or ft.)

Determine TDH (Total Dynamic Head)

TDH = Pumping level + Vertical Lift + Friction loss (pipe and fittings)

Determine Friction losses

Friction losses = Total length of pipe*Friction loss factor + Friction loss of fittings


1. Cable should be used as per cable selection chart

2. Install proper size of inlet/outlet pipes as mentioned on pump’s name plate data

3. To avoid friction in pipes, use PVC/uPVC pipes resulting into more water discharge

4. Avoid unnecessary bends as much as possible

5. Avoid overloading the motor by improper selection of pump

6. User proper conversion units to avoid any mismatch in pump selection data

Let our experts size pump for you

Completing this questionnaire will help us to understand your water pumping needs more accurately. Not all questions may apply to your situation but please give us as much information as you can.