Circulating Water Pump is briefly known as CWP. The CWP are used for water circulation through out the system. One CWP have a capacity of 40,000 tones/hour and weight of 126 tones. Its power consumption is about 6 MW.
Main parts of CWP:
Ø Pump casing
Ø Shaft
Ø Journal and Thrust bearings
Ø Diffuser
Ø Impeller
Ø Electric motor
Application of centrifugal pump in power station:
Ø Circulating water pump
Ø Feed water pump
Ø Condensate pump
Ø Fire fighting pump
Ø Demi water pump
Ø LP and HP heater pump
Ø Dosing pump etc.
Reciprocating pump:
A reciprocating pump is also known as a positive displacement pump, as it discharges a definite quantity of liquid during the displacement of its piston or plunger.
Comparison of Centrifugal and reciprocating pump:
| Serial No: | Centrifugal pump | Reciprocating pump |
| 01 | Suitable for large discharge and smaller heads. | Suitable for less discharge and higher heads. |
| 02 | Required less floor space and simple foundation. | Required more floor space and heavy foundation. |
| 03 | Maintenance cost is less. | Maintenance cost is high. |
| 04 | Can handle dirty water. | Can not handle dirty water. |
| 05 | Can run at high speed. | Can not run at high speed. |
| 06 | Its delivery is continuous. | Its delivery is pulsating. |
| 07 | No air vessel is required. | Air vessel is required. |
| 08 | Need priming. | Does not need priming. |
| 09 | It has less efficiency. | It has more efficiency. |
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