Friday, April 19, 2013

Pump's Specific Speed

Condenser is cooled by circulating water flow. The Parameters that monitoring by operator are condenser pressure, circulating water pump discharge pressure and condenser outlet temperature.

They are describe performance of condenser cause very potential to blocked or other say it is not enough flow to cooling of condenser.

Many power stations are not display circulating water flow due to difficulty cause big size of circulating water pipe header (bona pipe), but calculation from specific speed of pump can predicted how much circulating water flow is.

And from specific speed calculation can be selected best what non positive pump suitable is, it could be centrifugal, mixed or axial pump.




Specific speed maybe thought of as the operating speed at which a machine produces unit head at unit volume flow rate. Holding specific speed constant describe all operating conditions of geometrically similar machine with similar flow conditions.

It is customary to characterize a machine by its specific speed at design point. This specific speed has been found to characterize the hydraulic design feature of machine. Low specific speeds are produced efficiently by radial flow machine. High specific speeds are produced efficiently by axial flow machine.



Circulating water (CW) pump from its design blade can be typically mixed flow pump. Others data are 295 RPM of pump rotation, 1.2 Barg (2.2 Bara) of CW Pump discharge pressure. Pump water flow is 13.28 m^3/s.

H = 2.2 10^5 N/m^2 kg.m/s^2.N m^3/998kg = 220.4 m^2/s^2

Ns = [w.(Q)^1/2]/H^3/4

Ns = {[295 rot/min min/60s 2pi/rot] . [13.28 m^3/s]^1/2 } / [220.4 m^2/s^2]^3/4

Ns = 1.96 (mixed flow pump )


Information about Intake Problem, click below this...
http://idpowerstation.blogspot.com/2010/09/intake-problem.html

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