Thanks for the clarifications. It's still "relatively recent" :-) I
feel like such an old timer.
I was shocked when I saw the plans though for a project designed last
year with a gridded dry system..and reviewed/approved by a NICET
IV...and approved by a local official..and installed by the
contractor...and passed inspection that way. Some cracks still happen.
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
LinkedIn: https://www.linkedin.com/in/travismack
On 5/3/2016 10:02 AM, Jim Davidson wrote:
Travis,
The 1985 edition of NFPA 13 permitted gridded dry systems as follows:
5-2.3* Size of Systems.
5-2.3.1" Volume Limitations. Not more than 500-gal
(1893-L) system capacity for gridded systems or not more
than 750-gal (2839-L) system capacity for nongridded
systems shall be controlled by one dry-pipe valve.
Exception No. 7": If check valves are installed in
branches of the system to assist in more rapidly reducing
the air pressure above the valve seat to the dry-pipe valve
trip point, systems may exceed the above volume limitations,
but no system branch shall have a capacity exceeding
dO0 gal (7574 L) for gridded systems nor 600 gal (2277
L) for nongridded systems, nor shall the total of a system
branch plus common pipe exceed 500 gal (1893 L) for
gridded systems nor 750 gal (2839 L) for nongridded
[ systems. A hole ΒΌ in. (3.2 ram) in diameter shall be drilled
in the clapper of each check valve to permit equalization of
air pressure among the various parts of the system. An
approved indicating drain valve, connected by a bypass
around each check valve, shall be provided as a means for
draining the system. All check valves shall be located in
heated enclosures to prevent the formation of ice.
The 1987 edition of NFPA 13 stated the following:
5-2.3* Size of Systems.
I 5-2.3.1 Volume Limitations. Not more than 750-gal
(2839 L) system capacity shall be controlled by one dry pipe
valve. Gridded dry-pipe systems shall not be installed.
The gridded dry pipe system was not permitted since the 1987 edition of NFPA 13.
Have a fire safe day!
Regards
Jim
DAVIDSON ASSOCIATES
Fire Protection Engineering P. O. Box 4002
Code Consultants Greenville, DE 19807
(302) 994-9500
Fax (302) 994-3414
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-----Original Message-----
From: Sprinklerforum [mailto:[email protected]] On
Behalf Of Travis Mack, SET
Sent: Tuesday, May 03, 2016 12:46 PM
To: [email protected]
Subject: Re: Gridded dry system
As far as I know, it was sometime in the 70's or earlier where it was no longer
permitted. I ran into one that was installed last year as a gridded dry
system. No one caught it and it is sitting there today.
Things slip through the cracks.
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
LinkedIn: https://www.linkedin.com/in/travismack
On 5/3/2016 9:42 AM, Steve Sorrell wrote:
All,
I have come upon a gridded dry system fed by a fire pump that was installed in
1985.
I was sure that these are not legal, but could they have been in 1985 ?
Any help would be appreciated,
Steve
Stephen J. Sorrell, CET
NICET# 77901 Level III
E mail:
[email protected]<mailto:[email protected]>
Design Manager
Performance Fire Protection, LLC
Corporate Office
179 Gasoline Alley - PO Box 4510
Mooresville, NC 28117
Phone: 704-663-1664 Fax: 704-663-1652 Cell : 704-309-1242
Web: www.performancefire.com<http://www.performancefire.com/>
Licensed in NC, SC, VA, TN, GA, AL
"Performance on Every Level."
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