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Posted by Bob D. on March 19, 2004 at 06:24:55:
In Reply to: BOILER FEEDWATER PUMPS posted by HARISH on March 18, 2004 at 02:12:16:
Sure. That's pretty much a given anymore. "Usually" a constant differential pressure across the feedwater valve. Just be careful how you control the discharge recirculation, to maintain at least minimum flow through the pump at low steam loads and during start-up/shutdown. Also, be sure that your pump/drive/recirc system can still provide full flow at a discharge pressure 3% above the highest safety valve setpoint (per ASME, for power boilers).