Thanks Jim, I've had to deal with some pretty bizarre stuff, but haven't run across this one before. What's described in 7.4.2 is pretty much what they have. The PE left off the check valves and some other stuff.
But 7.4.2 pretty much describes the situation. They have (3) pairs arranged like this in the pit for a total of (6) valves. Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jim Johnston Sent: Monday, February 08, 2010 12:58 PM To: [email protected] Subject: RE: sand strainer? Was this one those that are shown in NFPA 13 - Parallel Combined systems? I could never figure why one would use these? Craig, I know you pretty on the ball with things but just in case look at 13- 2002 edition fig. 7.4.2.2? Jim Johnston, P.E. Fire Protection Engineer Inland Fire Protection, Inc 1100 Ahtanum Road Yakima, WA 98903 Phone 509-248-4471 Fax 509-248-1180 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Monday, February 08, 2010 9:51 AM To: [email protected] Subject: RE: sand strainer? Anyone ever see something like this before? A single 10 run-in rises up and with a "Y" connection serves (2) 6" Preaction valves, above the (2) P.A. valves the 6" lines come back together to a single 10" line out to some sort of preaction system somewhere. This was the engineer's design, done in 1977. Design criteria is this: "Hazard area: 0.30 gpm/sq. ft, max. head spacing of 90 sq. ft. 17/32" orifice heads." That's all there is. Any insight or just plain insanity? Was there any restriction on size of P.A. systems in '77? This one ought to be fun. Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
