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Feedwater Heater Drain Pump

Feedwater Heater Drain Pump

Feedwater Heater Drain Pump

(OP)
I am retrofitting a Horizontal Low Pressure Heater Train with drain pumps.  The current configuration is a pure cascading drain design from high to low and to the condenser.  Our performance engineers determined that we could realize a heat rate improvement by pumping the #2 heater drains back into the consendate line between the #1 & #2 Heaters.  The #2 Heater shell pressure is 14.0 psia and drain tempeature is @ 209.4F.  There is no drain cooler on this heater.  I am waffling on whether or not to put in a drain cooler to help prevent flashing in the pump(s).  The reason I am unsure is that the pump(s) will be on the ground floor, 34 feet below the heater, which is on the turbine deck.  My first blush look is that there is approx. 14.7 psi (34ft) of elevtaion head that should get the liquig entering the pump sufficiently away from the saturation line.  However, if any system upset or transient load drops the pressure in the heater more than 14.7 psi, the liquid will flash, possible in the pump.  As we all know, this is bad for the pump.  Any suggestions, or thoughts?

Thanks.

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