The makers of the program have (or did have) an expressed prohibition
against using the program if there are tie-in drains. Or at least they did
about 1.5 years ago when we looked into it for a job. If there are tie-in
drain you exceed the listing of the program.
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
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ken Holsopple
Sent: Thursday, June 28, 2007 4:12 PM
To: [email protected]
Subject: RE: Gang Drain for Attic Dry System
To all,
Now that the water is clearing up on this one, let me muddy up again. I
agree that the drain does not need to be included in the hydraulic
calculations, however what happens to this configuration for a water
delivery calculation. I would think the tie-in would need to be included
because of the (minimal)added volume, but more so because the effect a
tie-in drain may have on the side of the system that is opposite your
calculated sprinklers and how it affects the compression of the air in other
areas of the system. I think this would definitely affect water delivery in
a low pressure system.
I have done water delivery calculations, but I haven't attempted anything
other than side feed trees. In the calculations I have done, I have found it
amazing what some small things can affect a calculation where seconds are
precious. At this point, I don't not believe that the water delivery
software would accept this. And when I have some free time, I'll attempt it.
Does anybody have any thoughts on this one? I don't see anything in NFPA '13
'02 other than the delivery requirements.
Can of worms anyone?
Best Regards,
Ken Holsopple
Design Manager
Rowe Sprinkler Systems, Inc.
570-837-7647
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