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Centrifugal Pumps

A centrifugal pump is known as a rotodynamic pump that actually uses a rotating impeller to increase the pressure of the fluid. These types of pumps are commonly used to move liquid through a piping system. These fluids enter the pump impeller and near the rotating axis and it is further sped up by the impeller. The fluid floes outward into a diffuser or a volute chamber and there it exits into the down steam piping system.

Authentic centrifugal pumps were not fabricated until the late 1600's. Denis Papin fabricated a pump with straight vanes. The curved vanes were introduced by a man named John Appold in 1851, he was a British inventor.

A centrifugal pumps works along the lines like kinetic energy of a flowing fluid which is like velocity pressure going into static pressure. The rotation of the impeller speeds up the fluid as it passes the impeller eye and then comes out through the impeller vanes to the periphery. When the fluid exit's the impeller, a proportion of the fluid's momentum is changed over to static pressure. The volute shape of the pump casing or the diffuser vanes can help in the energy conversion .The conversion to energy can result in an increased pressure on the downstream side of the pump thereby causing flow.

There are different manufacturers such as Liberty , Dayton, Gould and Bell and Gossett. Here are a few of the more commonly used pumps. The Bell and Gossett In line Centrifugal Pump has a suction and discharge NPT size of 1-? inches, the speed is 1750 RPM's and is rated for ? horse power, the voltage is 115/230 and the motor frame size is 56CZ.

Dayton Centrifugal pump is a high head ? horse power, single phase, 115/230 volts, amperage is 12.2 2/6.1. The motor enclosure is ODP, it is a closed impeller with an impeller diameter of 4-7/16 inches.

Gould's pump is a Centrifugal Pump rated at ? horse power with 60 HZ, 208-230/460 volts with a current rating are 2.6/1.3 amps, impeller diameter of 3-7/8 inches and the motor is 3 phase.

The Liberty Pump is Centrifugal Pump with ? horse power, single phase, 115 volts, full load amperage at 8, intermittent duty with inlet/outlet garden hose thread, outside diameter of ? inches.