Not exactly what you are looking for but take a peak at NFPA 13 (2022) Section
19.3.3.3 regarding water curtains. As long as you include, and balance, the
additional demand in your calculations, it is my opinion that you should be
fine.
I recall back in the day we used to do this. I looked in NFPA 13 (2007) Section
22.8 and found the following:
22.8 In-Rack Sprinklers.
22.8.1 Pipes to in-rack sprinklers shall be sized by hydraulic calculations.
22.8.2 Water demand of sprinklers installed in racks shall be added to ceiling
sprinkler water demand over the same protected area at the point of connection.
22.8.3 The demand shall be balanced to the higher pressure.
22.8.4 Water demand of sprinklers installed in racks or water curtains shall be
added to the ceiling sprinkler water demand at the point of connection. Demands
shall be balanced to the higher pressure. (See Chapter 8.)
I believe the reference to Chapter 8 was incorrect and should have instead been
to Chapter 11.
Hope this helps,
Ryan L. Hinson, PE*, SET** \ Burns & McDonnell
Associate Fire Protection Engineer \ Upper Midwest Region
O 612-900-3755 \ M 763-688-4045 \ F 952-229-2923
[email protected]<mailto:[email protected]> \
burnsmcd.com<http://www.burnsmcd.com/>
8201 Norman Center Drive, Suite 500 \ Bloomington, MN 55437
*Registered in: AK, LA, MD, MN, PA, TX, & UT
**NICET IV - Water-Based Systems Layout
From: James Crawford <[email protected]>
Sent: Monday, August 12, 2024 5:26 PM
To: [email protected]
Subject: [Sprinklerforum] In-Rack system connected to an adjacent system
A question has been asked in our office regarding connecting an in-rack system
into an adjacent roof system.
It is in a multi-tenant building that has multiple roof zones, the system only
has 11 heads but does not work when connected into the roof system in that
tenant space.
Option is to run 500 feet back to the valve room or connect into an adjacent
roof system.
We can not find anything that says you can't but cannot find anything that says
you can.
My concern would be monitoring of the zones, so you would have multiple zones
going off if there was a fire.
Comments:
Thank You
James Crawford
Phaser Fire Protection Ltd.
Phone 604-888-0318
Cel: 604-790-0938
Email [email protected]<mailto:[email protected]>
Web: www.phaserfire.ca<http://www.phaserfire.ca/>
_________________________________________________________
SprinklerForum mailing list:
https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org
To unsubscribe send an email to [email protected]
