What are Condenser Water Pump concerns in this area?
Condenser water pump concerns in this area relate to the large sizes of pumps required for this application and, particularly, to 3600 rpm pump selections. Large flow pump selections, also, tend to be to the “right” of the best efficiency point (BEP), for the selected curve. Care must be taken when selecting Condenser Water pumps, or any open system pumps, at 3600 rpm. At any impeller operating point a 3600 rpm pump pulls twice the flow into the impeller eye as does an 1800 rpm unit. Consequently the NPSH requirement, due to flow resistance through the suction area and into the impeller eye, is elevated. It is not unusual for NPSHr on larger pumps, near runout conditions, or on 3600 rpm pumps, to be above 34 fta. (Atmospheric pressure at sea level) This means that the pump needs a POSITIVE inlet pressure, even when pumping cool water. Condenser water pumps, pulling through long lengths of piping, from a shallow tower collection pan may not have a positive inlet pressure. When selecting
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