'cuz they don't/didn't make a 10" PA valve? Couldn't take the friction
losses with 1-8"? SWAG...
Chris Cahill, P.E.
Fire Protection Engineer
Sentry Fire Protection, Inc.
763-658-4483
763-658-4921 fax
Email: chr...@sentryfiremn.com
Mail: P.O. Box 69
Waverly, MN 55390
Location: 4439 Hwy 12 SW
Waverly, MN 55390
-----Original Message-----
From: Prahl, Craig/SPB
Sent: Monday, February 08, 2010 12:51 PM
To: 'sprinklerforum@firesprinkler.org'
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
craig.pr...@ch2m.com
http://www.ch2m.com
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