Small Centrifugal Water Pump Efficiency

75 bigger is better.

Small centrifugal water pump efficiency.

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. High head high efficiency circulation pumps for water coolants and oil. 81 end suction water 30 hp. This is the first in a six part series on centrifugal pump efficiency.

7 1 efficiency of pumps. 75 vertical turbine water 30 hp. In the pump industry much of the work involves two extremely simple yet efficient machines the centrifugal pump and the ac induction motor. The centrifugal pump converts mechanical energy into hydraulic energy flow velocity and pressure and the ac motor converts electrical energy into mechanical energy.

Add about 5 points at 200 hp slower is better. 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. 65 submersible wastewater 34 hp. Typical pump efficiencies pump only brake no motor non clog centrifugal 25 hp.

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. Whp 146 4 x 654 3960 24 2 whp. Most centrifugal pumps cannot run dry ensure that the pump is always full of liquid. Centrifugal pump performances are tested by using clean cold water or viscous oil.

In this multi part series we will investigate several aspects of centrifugal pump efficiency first i will define efficiency and give some examples. Centrifugal pumps are used to transport fluids by the conversion of rotational kinetic energy to the hydrodynamic energy of the fluid flow. Propel liquid higher and farther than standard high efficiency circulation pumps. Whp hq 3960 where h is the total head of the water in feet and q is the flow rate in gallons per minute.

Add a couple points below 1200 rpm. So adding a double mechanical seal or dynamic seal may 2010 column to a small pump can reduce the obtainable efficiency. Included and the overall efficiency will be lower than pump efficiency. These pumps use less electricity to achieve the same flow rates as other circulation pumps.

For other articles in this series click centrifugal pump efficiency series. 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. The fluid enters the pump impeller along or near to the rotating axis and is accelerated by the impeller.