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)
