Mr. Rahe Loftin,P.E.: I agree with you. Usually the customer changes the occupancy or the use of the building or certain areas of the building or increase the size of the building. If the piping is at the beginning small then the customer is penalized because he has to revamp the system. There are some agencies that specify 20 fps to allow them to expand the building; to have a margin of safety if the city drops the pressure;to be sure to have 7 psi at the last sprinklers; to be sure that the highest branch has 15 psi. The water pressure will compensate if high velocities are used if the city would provide more pressure. The Hazen Williams formula was developed at 3 fps for open channels. Keep up the good work. Thank you. Mario Berrios, P.E. -----Original Message----- From: [EMAIL PROTECTED] To: [email protected] Sent: Mon, 15 Jan 2007 4:03 PM Subject: RE: max velocity
I suggest that Schedules 10 and 40 domestic pipe and (with a few quality imports excepted) domestic fittings as well, are the best way to assure the proverbial 50-year building. But the rest of it is just a waste of taxpayer money, as far as I'm concerned - especially velocity limits or any other unsubstantiated provision that only adds cost to the construction without tangible benefit. Our firm does a measurable percentage of work in the Federal jurisdiction (NAVFAC and ACOE, primarily) as well as State of California projects for schools and licensed healthcare. Although this work contributes to our bottom line and puts food on the table, I always marvel at how public money seems to be "cheaper" than private money - at least to the folks who spend it. Steve Leyton Protection Design & Consulting -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Monday, January 15, 2007 10:55 AM To: [email protected] Subject: RE: max velocity Folks, Here is some more food for thought. I provide the sprinkler specification for all of my federal projects. I use 20 fps velocity as a limit and a maximum C of 100 to insure that I have a system that has a chance to last for the life of the building (approximately 50+ years). Our buildings are always being changed with the sprinkler system being drained and modified many many times by all sorts of contractors, from the best to the worst. Once the building is constructed and occupied, the local GSA service center does all of the work in the building, usually with the lowest bidder. Therefore, we need some sort of hedge against all of this. Once the building is built, it is out of my control. I see no problem specifying these limits as long as everyone is bidding the same job. Any suggestions? Thank You Rahe Loftin, P.E. Region 7 - GSA Office - 817-978-7299 Fax - 817-978-8644 Cell - 817-371-3102 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum ________________________________________________________________________ Check out the new AOL. Most comprehensive set of free safety and security tools, free access to millions of high-quality videos from across the web, free AOL Mail and more. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
