Date: Fri, 29 Oct 2010 17:27:20 -0700
Subject: Re: Residential "Room Design Method"?
From: [email protected]
To: [email protected]
Design area(s) guys. Remote implies furthest from riser and we all
know that that is not always correct. Unfortunately the kids don't
know that and they get the wrong idea into their impressionable
little
heads when we say remote. Trust me. I have to fight this all the
time.
No matter how often I try to tell them the right stuff and then they
hear remote somewhere and all my good work is for naught. Cecil can
probably get my back on this.
On Fri, Oct 29, 2010 at 5:17 PM, A.P.Silva <[email protected]> wrote:
Would "hydraulically most remote" be more politically correct?
Tony
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Ron
Greenman
Sent: October 29, 2010 6:02 PM
To: [email protected]
Subject: Re: Residential "Room Design Method"?
Jamie,
Might I suggest changing your habit of saying "remote" area with the
more
proper and less confusing term "design" area. Remote more properly
refers to
the furthest distance from a DPV for the inspector's test
connection. Back
in the olden days, when most sprinklers went into manufacturing and
warehousing facilities, big, open buildings with tree systems and
typically
uniform branch lines, the "remote" area and the "design" area
typically were
the same, but that doesn't always hold true these days.
Additionally, until
you're sure there is only one then "design area(s)" is even more
apropos.
Don't get me wrong. I do the same thing on occasion. Old habits are
hard to
break, but I try to be cognitive of the fact that every time I use
"remote"
I'm inferring something I really don't mean.
On Fri, Oct 29, 2010 at 4:46 PM, Jamie.seidl <[email protected]>
wrote:
You need to calculate the most hydraulically remote 4 heads. This
is
typically a loaded branch line that supplies a bedroom on the end of
the
line. For instance (20x20 * (400 sqft) @ .10 gpm = 40 gpm). This end
head
pressure will act on the rest of the heads on the BL, closets,
bathroom,
hallway so your total demand on a BL can be upwards of 160 gpm,
depending on
configuration of the unit. Keep in mind, you can mix K factors in
residential occupancies to balance the hydraulics and minimize over
discharge.
Jamie
Sent from my iPhone
On Oct 29, 2010, at 7:24 PM, Carrol Glimstad
<[email protected]>
wrote:
I'm designing a residential project using res. heads (LFII) and
designing to full NFPA 13. When I calc my four heads using the
"design area", I am wondering if I can use the room design method
to
determine my sprinkler demand? For instance, I have a room that
measures 16' X 16', (256 sq. ft.) but the head is actually located
10
feet off of the 2 adjacent far walls. If using the flow rates
from
the chart I know that I need to flow 20 gpm from that head based
on my
maximum 20' x 20' spacing. But If I'm using the .10 over the
"design area"
can I just use the demand of 25.6 gpm for that head (16' x 16' sq.
ft.) versus the 40 gpm based on 20' x 20'? I understand then I
would
then base my system requirements on the more demanding of the two
methods. I can flow all four heads at a 20 gpm no problem, but
the 40
gpm from just one head.....ouch!
I haven't done residential in a looooong time, so thought I'd
check
for the heck of it and I'm pretty sure I'll find instead that I'm
full of
it!
Thanks in advance!
Carrol Glimstad
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--
Ron Greenman
Instructor
Fire Protection Engineering Technology
Bates Technical College
1101 So. Yakima Ave.
Tacoma, WA 98405
[email protected]
http://www.bates.ctc.edu/fireprotection/
253.680.7346
253.576.9700 (cell)
Member:
AFSA, SFPE, ASCET, NFPA, NFSA, AFAA, ASEE, NIBS, WSAFM, WFC
They are happy men whose natures sort with their vocations. -Francis
Bacon,
essayist, philosopher, and statesman (1561-1626)
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For Technical Assistance, send an email to:
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To Unsubscribe, send an email
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(Put the word unsubscribe in the subject field)
--
Ron Greenman
Instructor
Fire Protection Engineering Technology
Bates Technical College
1101 So. Yakima Ave.
Tacoma, WA 98405
[email protected]
http://www.bates.ctc.edu/fireprotection/
253.680.7346
253.576.9700 (cell)
Member:
AFSA, SFPE, ASCET, NFPA, NFSA, AFAA, ASEE, NIBS, WSAFM, WFC
They are happy men whose natures sort with their vocations. -Francis
Bacon, essayist, philosopher, and statesman (1561-1626)
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