What is the length of pipe from the pond to the pump inlet?
For a submersible pump, this is 0. Use the head loss chart to find the feet of friction loss. What is the length of pipe from the pump to the outlet? Use the head loss chart to find the feet of friction loss. What size is the piping? Remember that pond pumps are designed for high volumes at low pressures. Keep the pipe sizing up. You can lose a significant amount of pump flow and increase costs of operation when you undersize the pipe. Add up the number of Ells, 45’s and check valves in the piping and use the equivalent length chart to get an equivalent length of pipe. Total the required pressure to overcome friction losses and elevation to get the Feet of Head, or TDH, required. Add a couple of feet for miscellaneous. Now you know what performance is required of your pump. xxxx gph at xx ft of head. Does the customer prefer an external pump, or a submersible pump? External? Is a self priming pump required due to the height of the pump above the water level? If the pump is only 1’ to 1
