Select an Irrigation Pump
There are various types of pumps that are used to perform certain tasks. Many variables need to be considered when selecting the right size and type of pump. Choosing the wrong pump size for your irrigation system can result in a lot of wasted power.
If you choose to select your pump without using a pump dealer, one of the main things you will need to obtain is a pump curve. A pump curve, which is created by the pump manufacturer, shows the pump performance in an illustrated graph. Lower flows results from higher pressures and higher flows results from lower pressures.
The pumps performance is affected by two variables. The horsepower of the motor attached to the pump is the first variable. A pump has two parts the pump which actually moves the water and the motor which moves the pump. Bigger motors results in more volume and pressure giving an advantage if you have a pump that can be attached to different sizes of motors.
Size of the impeller is the second variable. The impeller is responsible for moving the water by spinning and causing a centrifugal action. Higher pressure is created when a larger impeller fits tighter in a case which prevents slippage. If you have higher pressure than what your system requires it may cause your system to waste energy. Determining the proper pump really boils down to selecting a model and size that produces the GPM (the flow amount that the pump is able to produce) and head (measured in feet of head, the amount of pressure the pump is able to produce). Pumps are generally sold with custom impeller sizes. A way to determine the impeller size you need is to draw a impeller curve through the feet head/GPM intersecting point making your curve parallel to the other impeller curves. Ultimately it would probably be easier and time saving to contact a pump dealer and provide them with your GPM and feet head you are looking to pump and they can provide you with the best fit for your irrigation needs.
When choosing an irrigation pump, the ultimate goal is to transfer water to your lawn in themost efficient way possible. An efficient irrigation system is one where the pump matches the needs of the water source, the piping system, and the irrigation equipment. Equipment would include the total length of the sprinkler system's longest pipe run, the pipe diameter, and the collective capacity of the sprinkler heads in gallons per minute. Since many different pump designs are available, you should be able to find one that is just right for your needs.
When making your decision, look at the technical features of each pump type - capacity, power, and efficiency. You need to already know the extent of your watering needs, the source of your water supply, how much power you will need, and the features you would like to have available. Doing so will insure that you will choose the ideal pump.