The formula that I was taught some time back is, Pu = $s (pressure unused equals dollars spent).
BK -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Fletcher, Ron Sent: Monday, June 02, 2008 9:12 AM To: [email protected] Subject: RE: High velocities Burn it up! -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Cahill Sent: Monday, June 02, 2008 7:47 AM To: [email protected] Subject: High velocities A question for where there is healthy pressures. Around here 60 is considered high. I know places with 28 static. Got a OHII system that needs to be changed to EXII. That's not negotiable. It's a 40 yo pipe schedule system. That appears to be in good shape. The BL need to be replaced for 100 sq.ft. but the main even the last 12' of 2.5", 25' of 3" and 36' of 3.5" can fly without being replaced. The openings are where I need them. There is a FP with about 140 psi at the 900gpm demand. The "problem" is the velocities in one segment of pipe are just about 40 (last piece of 3") and about 30 in the 3.5". I quote problem because I know 13 has no limit, this is not FM. There is still better than 15 psi safety. So the question is where you have pressure do you typically burn it up with small pipe size at the cost of velocities getting high or do you leave a lot of safety? Again not FM and OK per 13. Any thoughts on why this is a bad idea? It's easy to say just pull the offending pipe. In reality though you all know the competitive market and spending owners money. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [EMAIL PROTECTED] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 _______________________________________________ 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)
