When the deluge valve trips the pressure drops to nearly "0" for a few seconds until a pump spools up. There is a big surge to fill the system and equalize pressures. Both pumps will start on a pressure drop unless there is a time delay built in.
Art @ ATCO Fire -----Original Message----- Subject: RE: Fire Pump Selection - Another Question Don't forget that check valves remain closed until pressures equalize ! glc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Richard Malek eature and interaction of such options. On the issue of the two pumps meeting the demand, I see two scenarios. If the pumps are identical, supply to the discharge flanges and piping to a common point of the system are the same, each pump will supply essentially 50% of the demand. You could do some hand calcs to ballpark your pump sizing, etc. However, if you are going to use different pumps (different gpm, pressure, or the same size from different manufacturers - different curves) or the supply/discharge arrangement is different for identical pumps, you would need to develop a combined water supply curve. It would difficult to determine exactly where each pump will settle out on its curve and how much each will contribute to the supply without creating the combined curve (supply) and running a supply calc on the deluge system. Once you know where on the combined supply curve you are operating, you can back out how much each pump is contributing. Any combination where each pump is operating within the 150% of rated max is OK. Well, I hope that helps and if I missed something or I'm off in some way, someone will probably jump in. Rich Richard Malek [EMAIL PROTECTED] _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
