Bobby,
If you have two hydrants on site I would calculate a minimum 750 gpm
flowing at each hydrant, at a minimum pressure of 20 psi through your
underground back to the source to see if it can deliver what's needed.
Now to be honest, I haven't found anything that identifies that one can
evenly distribute the required fire flow through multiple hydrants, but
then again, I haven't found anything which says otherwise.
hope that's of some help,
*Ken Wagoner, SET
*Parsley Consulting***
*350 West 9th Avenue, Suite 206
*Escondido, California 92025
*****Phone 760-745-6181*
Visit the website <http://www.parsleyconsulting.com/> ***
On 10/24/2017 12:59 PM, Welch, Bobby wrote:
I know that the building requires 1,500 gpm because it is a fully
sprinklered building and it is only 38,000 square feet. And I know the
number of hydrants, there are two and per the table C105.1 they
require 2,000 – 2,250 gpm. I just don’t understand how this has to be
calculated would I have each hydrant flowing 1,000 gpm at 20 psi and
have a flowing node at the building feed flowing the sprinkler system
gpm and psi?
*From:*Sprinklerforum
[mailto:sprinklerforum-boun...@lists.firesprinkler.org] *On Behalf Of
*Parsley Consulting
*Sent:* Tuesday, October 24, 2017 3:54 PM
*To:* sprinklerforum@lists.firesprinkler.org; Welch, Bobby
<bobby.we...@veteranfireprotection.com>
*Subject:* Re: Underground Main
there
Bobby,
Not sure which area you're working in, however there is an appendix B
to the IFC or it's variants which shows how much fire flow is required
for a building based on it's square footage and construction type,
with the required pressure being 20 psi at the hydrant, at least in
the IFC and CFC I've worked with.
The number of hydrants required to deliver that flow is established in
the next appendix, C.
As I'm the soon-to- be ex-chair of the NFPA 24 committee please see
the disclaimer below.
*Ken Wagoner, SET
**Parsley Consulting**
350 West 9th Avenue, Suite 206
Escondido, California 92025
**Phone 760-745-6181
**Visit the website
<http://www.parsleyconsulting.com/>
IMPORTANT NOTICE: This correspondence is not a Formal Interpretation
issued pursuant to NFPA Regulations. Any opinion expressed is the
personal opinion of the author and does not necessarily represent the
official position of the NFPA or its Technical Committees. In
addition, this correspondence is neither intended, nor should it be
relied upon, to provide professional consultation or services
It should be noted that the above is my opinion as a member of the
NFPA Installation of Private Fire Service Mains and their
Appurtenances Committee in accordance with the NFPA Regulations
Governing Committee Projects and should therefore not be considered,
nor relied upon, as the official position of the NFPA or its Committees
<http://www.parsleyconsulting.com/>*
On 10/24/2017 12:24 PM, Welch, Bobby wrote:
I am working on a underground project were the new private fire
main is feeding the building sprinkler system and two hydrants. I
am told that the underground has to be calculated. I understand
how I calculate the building to prove that the sprinkler system
will work but how do I prove that the hydrants work as well?
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