Is the dry system water delivery software capable of modeling this
configuration, using a given water supply?
Best.
Bruce Verhei
> On 10/27/2021 9:50 AM Kevin Hall via Sprinklerforum
> wrote:
>
>
> If the pipe marked in red is removed and capped off, it eliminates any
> split
I do love a good can of worms! I fully expected differing opinions on this.
Ultimately, it comes down to how much delay there will be getting water to
any given open sprinkler and how much delay is deemed acceptable. If system
volume is less than 750 gpm (yes, a QOD is required) and it's not
IMHO, defining a grid as any system that can supply a sprinkler from more
than one direction is a poor threshold. Just because you install sprinklers
on a looped main or line, does not magically turn it into a gridded system.
The location of the sprinklers should have nothing to do with it.
May I
Here is an Informal Interpretation of a similar layout from November 13, 2009.
https://www.dropbox.com/sh/8e4v0xvfri07c5i/AADbhtdz25iS_1Qkdbnh1lWqa?dl=0
Regards,
Chad Mitchell
Mid Atlantic Fire Protection, Inc.
-Original Message-
From: Sprinklerforum On Behalf
Of J H via
So, on any looped system, if you add sprinklers to the looped main (adding
flow from more than two directions) does that now constitute a grid? I see
both viewpoints but am posing as devil's advocate. As I said I would steer
clear from the original scenario unless necessity dictated otherwise.
JH
I would call it a Tree/Loop hybrid. :-P
The branchlines are not connecting two parallel cross mains per the
definition of a grid.
JH
On Wed, Oct 27, 2021 at 9:50 AM Kevin Hall wrote:
> If the pipe marked in red is removed and capped off, it eliminates any
> split flows/transfer lines on the
If the pipe marked in red is removed and capped off, it eliminates any
split flows/transfer lines on the branch lines. So with the red pipe
removed I would define it as a tree. With the red pipe installed, I would
define it as a grid.
The above is my opinion and has not been processed as a formal
So, for discussions sake take a look at the image link - what would you all
call this system? I have my opinion but I don't see how it's much different
than Ed's original drawing:
https://ibb.co/xSW04dj
On Wed, Oct 27, 2021 at 9:46 AM J H wrote:
> So, for discussions sake take a look at the
Yes, I see that now... looks like I have another PI to add to the NFPA 13
list. Look for that line of sprinklers to be removed in the 2025 edition
haha.
The above is my opinion and has not been processed as a formal
interpretation in accordance with the NFPA Regulations Governing Committee
Kevin,
That's true for most of the sprinklers in the diagram but look at figure
A.3.3.206.6 (2019) - the farthest loop from the supply has sprinklers on it
and it's connecting both loops - those sprinklers are receiving water from
two mains. Likewise, per the definition of a main the only main in
The annex shows the branch lines fed by the cross main from two directions,
the sprinkler can still only receive water from one direction from the
branch line... that is the distinction in the definition.
The above is my opinion and has not been processed as a formal
interpretation in accordance
I have a problem with the simplified definition floated out here that a
grid system is one that feeds a sprinkler from two directions because of
the illustration of a looped system in the annex of '13 which shows
sprinklers attached to the end portion of the loop resulting in those
sprinklers
If you were to put caps on the left and right lines going north and south, it
resembles a compound gridded system and a sprinkler can receive water from both
sides.
The east and west lines are essentially the mains and so is the 4" in the
middle.
Yes is has a looped piping arrangement and
Thanks Mickey!
Brian Harris, CET
BVS Systems Inc.
bvssytemsinc.com
-Original Message-
From: Sprinklerforum On Behalf
Of Mickey Ferguson via Sprinklerforum
Sent: Wednesday, October 27, 2021 7:57 AM
To: Mickey Ferguson ;
sprinklerforum@lists.firesprinkler.org
Cc: Mickey Ferguson ; Brian
Thanks Mike!
Brian Harris, CET
BVS Systems Inc.
bvssytemsinc.com
-Original Message-
From: Sprinklerforum On Behalf
Of Mike Morey via Sprinklerforum
Sent: Wednesday, October 27, 2021 7:55 AM
To: sprinklerforum@lists.firesprinkler.org
Cc: Mike Morey
Subject: RE: Attic Piping
We don't
Taylor-
Thank you.
Brian Harris, CET
BVS Systems Inc.
bvssytemsinc.com
-Original Message-
From: Sprinklerforum On Behalf
Of Taylor Schumacher via Sprinklerforum
Sent: Wednesday, October 27, 2021 7:53 AM
To: sprinklerforum@lists.firesprinkler.org
Cc: Taylor Schumacher
Subject: RE:
For the safety of the installers so they do not have to climb up in the top of
an attic or have to make make-shift ladders, I typically try to put the main
down the middle for the BB's at chest high and use sprigs. This also helps with
getting over mechanical equipment/duct that may be in the
Todd-
Thank you.
Brian Harris, CET
BVS Systems Inc.
bvssytemsinc.com
-Original Message-
From: Sprinklerforum On Behalf
Of Fpdcdesign via Sprinklerforum
Sent: Wednesday, October 27, 2021 7:24 AM
To: Sprinklerforum
Cc: Fpdcdesign
Subject: Re: Attic Piping
I typically use
We don't do many, but over the years I've done a decent amount personally, some
of my experience is dated and/or lacks trial and error honing but my 2 cents
worth is: I always use BBs when I can, make sure you look at each of the 3(at
least) offerings of them currently as they have different
Good morning Brian,
Your fitters will hate you if they have to set the main high towards the ridge.
The best way is to use a single main, hung low, with 1" or 1-1/4" sprigs to the
back to back sprinklers at the ridge. If you have a mechanical chase that
extends in to the attic, you may have to
I typically use option 2. Sometimes the framing at the peak can be a little
funky and it is easier to adjust a smaller line. Also, I will put 1” outlets on
any welded pipe for attic sprinklers, in case sprigs become necessary.
Todd G Williams, PE
Fire Protection
Seems were seeing more and more wood framed buildings these days and with that
comes attics. Just curious what the general school of thought is with running
piping in these spaces. Is it better to run the Main high under the ridges with
back to back heads (size permitting) or is it better run
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