Effciencies of some vertical-shaft turbine pumps approach 90 percent. Typical efficiency ranges of irrigation pumps. Most irrigation dealers offer a variety of pumps spanning the entire efficiency range shown. Values are representative for most pumps, but there are some exceptions in all categories. Pump characteristic curves shoule be consulted to select a pump that provides the desired efficiency for a particular set of operating conditions.
Submersible pumps are generally lower in effciency.
Depending on the size and design, they are typically 3 to 5 percent less efficient than vertical-shaft turbine pumps of the same capacity. Centrifugal pump effciencies vary the most, ranging from 55 to 85 percent. As the size of centrifugal pumps decreases, the efficiency decreases. Also, some of the less expensive small pumps are fairly low in effciency. Self-priming centrifugal pumps tend to be least efficient.