Small Centrifugal Water Pump Efficiency

Centrifugal pumps are used to transport fluids by the conversion of rotational kinetic energy to the hydrodynamic energy of the fluid flow.

Small centrifugal water pump efficiency.

This is the first in a six part series on centrifugal pump efficiency. For pumps below about 15 hp mechanical losses such as from bearings lip seals mechanical seals and misalignment can have a noticeable impact on pump efficiency. Most centrifugal pumps cannot run dry ensure that the pump is always full of liquid. 65 submersible wastewater 34 hp.

Whp 146 4 x 654 3960 24 2 whp. Typical pump efficiencies pump only brake no motor non clog centrifugal 25 hp. In residential systems to ensure that the pump stays full of the liquid use a check valve also called a foot valve at the water source end of the suction line. In the pump industry much of the work involves two extremely simple yet efficient machines the centrifugal pump and the ac induction motor.

In this multi part series we will investigate several aspects of centrifugal pump efficiency first i will define efficiency and give some examples. For other articles in this series click centrifugal pump efficiency series. 7 1 efficiency of pumps. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller.

The centrifugal pump converts mechanical energy into hydraulic energy flow velocity and pressure and the ac motor converts electrical energy into mechanical energy. 75 vertical turbine water 30 hp. For example if the flow rate for the previous centrifugal pump was 654 gpm the water horsepower for the pump would be. Add about 5 points at 200 hp slower is better.

The rotational energy typically comes from an engine or electric motor. Pump efficiency is determined by principally two parameters head and flow rate in addition to other factors such as properties of the fluid impeller design and motor speed selected. They are a sub class of dynamic axisymmetric work absorbing turbomachinery. A small sized centrifugal pump is improved in its efficiency and performance by having an impeller the height of which is higher than theoretically calculated value and decreases in the circumferential direction from the central portion and which has a flow channel with a narrow and constant width.

These pumps use less electricity to achieve the same flow rates as other circulation pumps. 81 end suction water 30 hp. Whp hq 3960 where h is the total head of the water in feet and q is the flow rate in gallons per minute. So adding a double mechanical seal or dynamic seal may 2010 column to a small pump can reduce the obtainable efficiency.

75 bigger is better. Centrifugal pump performances are tested by using clean cold water or viscous oil. Propel liquid higher and farther than standard high efficiency circulation pumps.