"This is something I should know..." is the reason I wanted to offer help. And i could not care less about the opinion of some of my peers.
-----Original Message----- From: George Church [mailto:[email protected]] Sent: Wednesday, May 09, 2012 2:15 PM To: [email protected] Subject: RE: Adjusting Pump Curves for Pump Speed I was thinking of your typing fingers, that u use more than enough in the opinion of at least some of your peers. Bill just needs to adjust his output, size of the impeller is likely irrelevant. George L. Church, Jr., CET Rowe Sprinkler Systems, Inc. PO Box 407, Middleburg, PA 17842 877-324-ROWE 570-837-6335 fax [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Wednesday, May 09, 2012 3:07 PM To: [email protected] Subject: RE: Adjusting Pump Curves for Pump Speed I thought about that George- something I don't use much anymore anyway-- it's like you were reading my mind, or memory. I have an excellent memory, it's just short 0_Q -----Original Message----- From: George Church [mailto:[email protected]] Sent: Wednesday, May 09, 2012 2:02 PM To: [email protected] Subject: RE: Adjusting Pump Curves for Pump Speed Maybe if you'd up the ante by offering to put something else on the chopping block? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Wednesday, May 09, 2012 2:52 PM To: [email protected] Subject: RE: Adjusting Pump Curves for Pump Speed Mr. Brooks, Where it comes to de-mystifying fire pumps, there is nothing like using feet and seconds only, and putting gravity back in. It makes the affinity laws, which is the subject of your post, especially clear. If you would, please, post the rated pressure for the 3450 rated speed, and I will put my pride on the Forum Chopping Block by posting the impeller diameter. I do not want or need the rated GPM to do this (I would have to have GPM to post the rated horsepower though). My intent here is to help Forumites see how clean and simple all things sprinkler calc can be, and if I can do it, anybody can. If you do not have the time or interest it is fine-- i posted something similar a couple years ago. Brad Casterline -----Original Message----- From: George Church [mailto:[email protected]] Sent: Wednesday, May 09, 2012 1:49 PM To: [email protected] Subject: RE: Adjusting Pump Curves for Pump Speed Its exponential- small bump in speed can give amazing results :) when you find yourself a little short. Yes, our driver WAS listed for the higher speed back in 1968.... George L. Church, Jr., CET Rowe Sprinkler Systems, Inc. PO Box 407, Middleburg, PA 17842 877-324-ROWE 570-837-6335 fax [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bill Brooks Sent: Wednesday, May 09, 2012 12:32 PM To: [email protected] Subject: RE: Adjusting Pump Curves for Pump Speed Thanks, age is a good thing in some products, but ... Bill Brooks -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Wednesday, May 09, 2012 12:20 PM To: [email protected] Subject: RE: Adjusting Pump Curves for Pump Speed See NFPA 20, A.14.2.5.4(7)(f) on page 90 of the 2010 ed. Steve Leyton -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bill Brooks Sent: Wednesday, May 09, 2012 9:11 AM To: [email protected] Subject: Adjusting Pump Curves for Pump Speed This is something I should know, but how are pump curves adjusted for pump speed? I'm looking at a curve based on 3450 rpm (60 Hz) and want to adjust it for 2900 rpm (50 Hz). Is this possible? Bill Brooks William N. Brooks, P.E. Brooks Fire Protection Engineering Inc. 372 Wilett Drive Severna Park, MD 21146-1904 410-544-3620 410-544-3032 FAX 412-400-6528 Cell _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
