Overview
Centrifugal pumps handle high flow rates, provide smooth, nonpulsating delivery,
and regulate the flow rate over a wide range without damaging the pump. Centrifugal
pumps have few moving parts, and the wear caused by normal operation is minimal.
They are also compact and easily disassembled for maintenance.
The efficiency of pumping system depends on relationships between fluid flow rate, piping
layout, control methodology, and pump selection. Selection of a centrifugal pump is
based on its application.
Centrifugal Pump Performance
Centrifugal pumps are generally divided into three classes: radial flow, mixed flow,
and axial flow. Impeller design variations can be used to design specific pumps that perform efficiently under specified conditions that vary from low flow rate with high head to high flow rate with low head. The amount of fluid a centrifugal pump moves depends on the differential
pressure or head it supplies. The flow rate increases as the head decreases.
Manufacturers provide information on range of heads and flow rates that a particular pump model can provide.
Before you select a pump model, examine its performance curve, which is indicated by
its head-flow rate or operating curve. The curve shows the pump’s capacity (in gallons
per minute [gpm]) plotted against total developed head (in feet). It also shows efficiency
(percentage), required power input (in brake-horsepower [bhp]), and suction head
requirements (net positive suction head requirement in feet) over a range of flow rates.
Pump curves also indicate pump size and type, operating speed (in revolutions per
minute), and impeller size (in inches). It also shows the pump’s best efficiency point (BEP).
The pump operates most cost effectively when the operating point is close to the BEP.
Pumps can generally be ordered with a variety of impeller sizes. Each impeller has a
separate performance curve To minimize pumping system energy
consumption, select a pump so the system requirement is within 20% of pump's
BEP, and select a mid range impeller that can be trimmed or replaced to meet higher or
lower flow rate requirements.Select a pump with high efficiency contours over your
range of expected operating points. A few points of efficiency improvement can
save significant energy over the life of the pump.
http://energy.gov/sites/prod/files/2014/05/f16/efficient_centrifug_pumps.pdf
Centrifugal pumps handle high flow rates, provide smooth, nonpulsating delivery,
and regulate the flow rate over a wide range without damaging the pump. Centrifugal
pumps have few moving parts, and the wear caused by normal operation is minimal.
They are also compact and easily disassembled for maintenance.
The efficiency of pumping system depends on relationships between fluid flow rate, piping
layout, control methodology, and pump selection. Selection of a centrifugal pump is
based on its application.
Centrifugal Pump Performance
Centrifugal pumps are generally divided into three classes: radial flow, mixed flow,
and axial flow. Impeller design variations can be used to design specific pumps that perform efficiently under specified conditions that vary from low flow rate with high head to high flow rate with low head. The amount of fluid a centrifugal pump moves depends on the differential
pressure or head it supplies. The flow rate increases as the head decreases.
Manufacturers provide information on range of heads and flow rates that a particular pump model can provide.
Before you select a pump model, examine its performance curve, which is indicated by
its head-flow rate or operating curve. The curve shows the pump’s capacity (in gallons
per minute [gpm]) plotted against total developed head (in feet). It also shows efficiency
(percentage), required power input (in brake-horsepower [bhp]), and suction head
requirements (net positive suction head requirement in feet) over a range of flow rates.
Pump curves also indicate pump size and type, operating speed (in revolutions per
minute), and impeller size (in inches). It also shows the pump’s best efficiency point (BEP).
The pump operates most cost effectively when the operating point is close to the BEP.
Pumps can generally be ordered with a variety of impeller sizes. Each impeller has a
separate performance curve To minimize pumping system energy
consumption, select a pump so the system requirement is within 20% of pump's
BEP, and select a mid range impeller that can be trimmed or replaced to meet higher or
lower flow rate requirements.Select a pump with high efficiency contours over your
range of expected operating points. A few points of efficiency improvement can
save significant energy over the life of the pump.
http://energy.gov/sites/prod/files/2014/05/f16/efficient_centrifug_pumps.pdf
