24.1.3 Size of Fire Mains.
24.1.3.1 Except as provided in 24.1.3.2, no pipe smaller than 6 in. (150
mm) in diameter shall be installed as a private service main.
24.1.3.2 For mains that do not supply hydrants, sizes smaller than 6 in.
(150 mm) shall be permitted to be used subject to the following
restrictions:
(1) The main supplies only automatic sprinkler systems, open sprinkler
systems, water spray fixed systems, foam systems, or Class II standpipe
systems.
(2) Hydraulic calculations show that the main will supply the total
demand at the appropriate pressure. Systems that are not hydraulically
calculated shall have a main at least as large as the system riser.
24.1.3.3* When a single main less than 4 in. (100 mm) in diameter serves
both domestic and fire systems, the domestic demand shall be added to
the hydraulic calculations for the fire system at the point of
connection unless provisions have been made to isolate the domestic demand.
Travis Mack, SET
MFP Design, LLC
2508 E Lodgepole Drive
Gilbert, AZ 85298
480-505-9271
fax: 866-430-6107
email:[email protected]
http://www.mfpdesign.com
https://www.facebook.com/pages/MFP-Design-LLC/92218417692
Send large files to us via: https://www.hightail.com/u/MFPDesign
On 3/20/2015 12:37 PM, Mike Hill wrote:
NFPA 13 (2013) Chapter 24 has some guidance.
Mike Hill
-----Original Message-----
From: Sprinklerforum [mailto:[email protected]]
On Behalf Of Richard Mote
Sent: Friday, March 20, 2015 3:11 PM
To: [email protected]
Subject: Minimum size od Underground supply.
I seem to remember somewhere in NFPA 13 that the minimum size for U/G piping
was 6" for ordinary hazard systems. Now someone wants chapter and verse and
I'll be darned if I can find It.
Richard L. Mote CET
Design Manager
Rowe Sprinkler Systems, Inc.
P 570-837-7647 or 877-324-ROWE
F 570-837-6335
[email protected]
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