Swimming Pool Pumps
We offer a complete line of swimming pool pumps and parts, from all the major manufactures. Sta-Rite, Hayward, American Products, Purex, Pac Fab, Jacuzzi and others Whether its a single part or a complete pump we can supply your needs
Sizing Your Swimming Pool Pumps
The pump consists of two principal parts: A motor and
the wet end. The motor provides the power to move the components located
in the wet end. The wet end consists of a trap, and impeller, which is
responsible for moving the water.
The pump is probably the most important single piece of equipment in the circulation system. Selecting a pool pump is determined by a long list of factors. It is best to review this list even if you are replacing an existent pump with the same size. If you are tempted to increase the HP of the pump, you must read and understand this.
Total dynamic head (TDH) is the sum of the resistance experienced by water flowing through the pipes and filter system. Each elbow, foot of pipe, fittings and anything else that is in the circulation system increases the Total Dynamic Head. The TDH will affect the flow rate. For a new pool this is somewhat more easy to calculate, but for an existing pool, with piping below the ground it is much more difficult.
Head loss factors
Let's use a 1 HP pump to perform a calculation, Reading the table above we have 9 feet of head.
2. Friction loss (pressure side): _____(clean filter pressure) PSIG x 2.31 ft. of head / PSIG = ______ft of head (pressure side). Typically filter pressure should be 10-15 lbs.
Using 10 feet of pressure we will have 23 ft. of head on the pressure side.
3. The Total Dynamic Head: __9_(Vacuum)__ + _23(Pressure)_
Practically speaking 30-40 feet of head is a good estimate to size a pump. which can be adjusted upward or downward depending on the circumstances.
Typical Performance Chart for a Pool Pump
|20 ft.||30 ft.||40 ft.||50 ft.||60 ft.||70 ft.|
Pipe Flow Characteristics
Pipe characteristic (maximum Flow)
Pipe Size (PVC)
|Pump Output (GPM) versus Total Resistance to Flow (feet of Head)|
Suction Line (vacuum)
Return Line (pressure)
|1-1/2 "||50 GPM||65 GPM|
|2||85 GPM||105 GPM|