HomeMy WebLinkAboutFire Flow ReportJanuary 10, 2011
Ms. Erika Bridges
City of College Station
1101 Texas Avenue
College Station, Texas 77842
Re: Fire Flow Report
Southside Plaza Phase 2
4081 State Highway 6 South
College Station, Texas
Gessner Engineering Job No.: 10 -0548
Dear Ms. Bridges:
The fire flow test information was provided by the City of College Station to
Gessner Engineering in regards to the fire hydrant located at 4089 State
Highway 6 South. The fire flow information is as follows:
The standard formula given in AWVVA M -17 (1989), shown below, was Suite 102
utilized for converting test flow data to distribution capacity at the
minimum 20 psi residual pressure. College station, Texas 77840
Static Pressure
Residual Pressure
Flow
4089 State Hwy 6 S
104 psi
102 psi
1455 gpm
According to the International Fire Code, the fire flow demand required
for the 12,424 square foot building at this site is 2,250 gallons per minute
(gpm) with flow duration of two (2) hours. This demand was determined
for a Type IIB building with 9,801- 12,600 square feet of fire flow
calculation area. The proposed building will have a sprinkler system
built in. It is our understanding structures including sprinkler systems
allow for a 50% reduction of required fire demand. This reduces the total
fire demand to 1,125 gpm for the site. However, a minimum required fire
flow of 1,500 gpm will be used for this site.
where,
L'r - Qt
P — P
PS — P ty
0.54
Q = fire flow at residual pressure P (gpm)
Q = hydrant discharge during test (gpm)
P = static pressure (psi)
P = desired residual pressure (psi)
P = residual pressure during test (psi)
N: \Gessner Eng Data 10 \10 -0548 Southside Plaza Ph 2 \Civil\DOC \10 -0548 Fire Flow Report.doc
G
Gessner
Engineering
2501 Ashford Drive
P.O. Box 10763, 77842
979.680.8840
fax 979.680.8841
2204 S. Chappell Hill Street
Brenham, Texas 77833
979.836.6855
fax 979.836.6847
The flow available with a 20 psi residual pressure at 4081 State Highway 6 South
(planned area of development) is calculated to be approximately 10,950 gallons
per minute from the hydrant test data provided. Therefore, the proposed site
should have adequate fire flow for the proposed Southside Plaza Phase 2.
Fire suppression supply pipes were sized using the water distribution modeling
software, EPANET, developed by the EPA's Water Supply and Water Resources
Division. The modeled system head loss was computed using the Hazen -
Williams based hydraulic analysis.
Please contact us if you have any questions or if we can be of further assistance.
Sincerely,
GESSNER ENGINEERING, F -7451
Melissa P. homas, P.E.
1 a �
Kyle M. Zapalac, M.E., E.I.T
-"tEOFtF
MESA P. THOM
i
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G N:K7essner Eng Data 1O \10 -0548 Southside Plaza Ph 2 \Civil\DOC \10 -0548 Fire Flow Report.doc Gessner Engineering
co— 63,4fflayo-
Date Thursday November 4, 2010
Time 1:00 P.M.
Test
completed by Vincent Rodriquez
Witness Justin Tamplin
Location 4089 State Hwy 6 S.
Nozzle size 2.5
Flow hydrant T -012
Pitot reading 75
G.P.M. 1455
Static hydrant T -011
Static PSI 104
Residual PSI 102
Comments Requested flow
SbuA' Le- Pk 2
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