HomeMy WebLinkAboutFire Flow ReportDecember 22, 2011
Mr. Stephen Maldonado Jr.
City of College Station Water Services Department
1101 Texas Avenue
College Station, TX 77842
Re: Fire Flow Report
Brazos Fellowship Addition
226 Southwest Parkway East
College Station, Texas
Gessner Engineering Job No.: 11-0361
Dear Mr. Maldonado:
The fire flow test information was provided by the City of College Station to
Gessner Engineering in regards to the fire hydrant located on the southeast side
of the subject tract, 226 Southwest Parkway East. The fire flow information is as
follows:
226 Southwest Pkw E.
Static Pressure
100 psi
Residual Pressure
97 psi
Flow
1550 gpm
According to the International Fire Code, the fire flow demand required
at this site is 3,750 gallons per minute with a flow duration of three (3)
hours. This demand was determined for a Type IIIB building with 29,569
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 1,875 gallons per minute for the
site.
The standard formula given in AWWA M-17 (1989), shown below, was
utilized for converting test flow data to distribution capacity at the
minimum 20 psi residual pressure.
0.54
nc nt
n _ ,
where, Qr = fire flow at residual pressure Pr (gpm)
Qt = hydrant discharge during test (gpm)
Px = static pressure (psi)
Pr = desired residual pressure (psi)
Pt = residual pressure during test (psi)
Gessner
Engineering
2501 Ashford Drive
Suite 102
College Station, Texas 77840
P.O. Box 10763, 77842-0763
979.680.8840
FAX 979.680,8841
2204 S. Chappell Hill Sr.
Brenharn,Texas 77833
979.836A855
FAX 979.836.6847
The flow available in the existing system, with a 20 psi residual pressure at 226
Southwest Parkway East (planned area of development), is above the required
1,875 gpm. The available flow can be distributed over 3 fire hydrants located
within 300' of the proposed addition, and the 3 hydrants can meet the require
1,875 gpm fire flow requirement for the proposed Brazos Fellowship addition.
Fire suppression supply pipes are in place at the existing site, and no
modifications to the supply system is proposed.
Please contact us if you have any questions or if we can be of further assistance.
Sincerely,
GESSNER 9NG#LERING, F-7451
!/
P.E., C.F.M.
0 Gessner Engineering
November 16, 2011
Mr. Stephen Maldonado Jr.
City of College Station Water Services Department
1101 Texas Avenue
College Station, TX 77842
Re: Fire Flow Report
Brazos Fellowship Addition
226 Southwest Parkway East
College Station, Texas
Gessner Engineering Job No.: 11-0361
Dear Mr. Maldonado:
The fire flow test information was provided by the City of College Station to
Gessner Engineering in regards to the fire hydrant located on the southeast side
of the subject tract, 226 Southwest Parkway East. The fire flow information is as
follows:
226 Southwest Pkwy E.
Static Pressure
100 psi
Residual Pressure
97 psi
Flow
1550 gpm
According to the International Fire Code, the fire flow demand required
at this site is 3,750 gallons per minute with a flow duration of three (3)
hours. This demand was determined for a Type IIIB building with 29,569
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 1,875 gallons per minute for the
site.
The standard formula given in AWWA M-17 (1989), shown below, was
utilized for converting test flow data to distribution capacity at the
minimum 20 psi residual pressure.
0.54
P,. — P,.
Q, =Q P —P
s
where, Q, = fire flow at residual pressure P, (gpm)
QI = hydrant discharge during test (gpm)
P,, = static pressure (psi)
Pr = desired residual pressure (psi)
Pt = residual pressure during test (psi)
Gessner
Engineering
2501 Ashford Drive
Suite 102
College Station,'Iexas 77840
P.O. Box 10763, 77842-0763
979.680.8840
FAX 979.680.8841
2204 S. Chappell Hill St.
Brcnham,l'cxas 77833
979.836.6855
FAX 979.836.6847
The flow available with a 20 psi residual pressure at 226 Southwest Parkway
East (planned area of development) is calculated to be approximately 9,128
gallons per minute from the hydrant test data provided. Therefore, the proposed
site should have adequate fire flow for the proposed Brazos Fellowship addition.
Fire suppression supply pipes are in place at the existing site, and no
modifications to the supply system is proposed.
Please contact us if you have any questions or if we can be of further assistance.
Sincerely,
GESSN,RRI EttAINEERING, F-7451
JOp
ere °r ers, P.E., C.F.M. b�P�c i P
JEREMY N. PETERS
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100217
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Kyle M. Zapalac, M.E., E.I.T.
0 Gessner Engineering