This is an interesting issue on the FDC. My understanding is the FDC on
a *sprinkler *system is not required to accommodate the largest
sprinkler demand. It is a supplement to the main water supply.
Otherwise, we would be calculating the FDC piping for all systems, like
we do a manual standpipe system.
For example, is a fire dept connection required to be sized to supply an
ESFR sprinkler system with 45' of storage and K25 ESFR sprinklers? If
so, that 4" FDC put on the building is not near adequate. Now, I am not
saying it is not a bad idea, and we are always allowed to do more than
the minimum required by NFPA 13. But, I don't believe that NFPA 13
mandates that the FDC be capable of fully supplying the fire sprinkler
systems. Note: This does not stand true for manual standpipe systems.
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
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On 12/3/2014 9:30 AM, Dick Culver wrote:
Brian
The FDC supply piping should be sized to accommodate the largest
sprinkler demand. The FDC should be sized to accommodate the local fire
service. FDC size smaller than 4", on most cases, requires the fire service
to carry adaptors to connect to a smaller size even though it is acceptable
by standard. On small systems the FDC pipe size may be 2 1/2" but the FDC
itself is 4". This allows the fire service to quickly connect to the system
in an emergency with their standard equipment. The local fire should make
the call.
Dick Culver
-----Original Message-----
From: Sprinklerforum [mailto:[email protected]]
On Behalf Of Brian Harris
Sent: Wednesday, December 03, 2014 10:42 AM
To: [email protected]
Subject: RE: Riser Size
Thanks Travis-
I guess I should have mentioned that this job has (2) systems, (1) wet & (1)
dry that's why I was saying the FDC had to be 4". I will get in touch with
the civil guy and ask for some calc's though.
Brian Harris, CET
BVS Systems Inc.
bvssytemsinc.com
-----Original Message-----
From: Sprinklerforum [mailto:[email protected]]
On Behalf Of Travis Mack
Sent: Wednesday, December 03, 2014 10:39 AM
To: [email protected]
Subject: Re: Riser Size
FDC does not have to be 4". It can be smaller. We see this a lot with
apartments designed to nfpa 13. A 2" supply can often feed sprinklers with
the right conditions.
I have run into cases where the civil has sized the underground too small. I
just send the info from NFPA 13 & 24 that says minimum 6" unless
hydraulically calculated. I ask them to provide calculations if the UG size
is causing us problems. If no calculations then we state either it has to be
a 6" pipe or a change order for increased interior piping due to improperly
sized supply lines.
Travis Mack, SET
MFP Design, LLC
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Sent from my iPhone
On Dec 3, 2014, at 8:19 AM, Brian Harris <[email protected]>
wrote:
Todd-
What's your take on the FDC coming off the Riser & the 2" underground?
Brian Harris, CET
BVS Systems Inc.
bvssytemsinc.com
-----Original Message-----
From: Sprinklerforum
[mailto:[email protected]] On Behalf Of
Todd - Work
Sent: Wednesday, December 03, 2014 9:58 AM
To: [email protected]
Subject: Re: Riser Size
I have always sized them by hydraulic calculation (or pipe schedule). No
minimums.
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
www.fpdc.com
860-535-2080 (ofc)
On Dec 3, 2014, at 9:43 AM, Brian Harris <[email protected]>
wrote:
I can't seem to put my finger on it this morning but is there a minimum
size requirement for the Riser in a 13 system? I know there is for the FDC
connection and the underground main to the building but I don't see anything
the limits the size of the Riser except the hydraulic calculations. In this
particular job the FDC is located on the Riser so I assume the Riser would
at least have to be 4" up to the FDC connection. Currently the civil drawing
is show a 2" supply to the building from a 6" underground main....
Brian Harris, CET
BVS Systems Inc.
Sprinkler Division
bvssystemsinc.com<http://bvssystemsinc.com/>
Phone: 704.896.9989
Fax: 704.896.1935
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