HomeMy WebLinkAboutFire Flow July 25, 2011
Mr. Stephen Maldonado Jr.
City of College Station Water Services Department
1101 Texas Avenue
College Station, TX 77842
Re: Fire Flow Report
Stepping Stone School
205 Rock Prairie Road
College Station, Texas
Gessner Engineering Job No.: 11 -0152
Dear Mr. Maldonado:
The fire flow test information was provided by the City of College Station to
Gessner Engineering in regards to the fire hydrants located at 209 Rock Prairie
Road and 205 Rock Prairie Road. The fire flow information is as follows:
205 Rock Prairie Rd 209 Rock Prairie Rd
Static Pressure 88 psi 72 psi
Residual Pressure 84 psi 68 psi
Flow 1300 gpm 1300 gpm
According to the International Fire Code, the fire flow demand required
at this site is 2,000 gallons per minute with a flow duration of two (2)
hours. This demand was determined for a Type V -B building with 4,801-
6,200 square feet of fire flow calculation area. The proposed building
will have a sprinkler system which allows for a 50% reduction of required Lessner
fire demand. This reduces the total fire demand to 1,000 gallons per
minute for the site. Engineering
The standard formula given in AWWA M -17 (1989), shown below, was 2501 Ashford Drive
utilized for converting test flow data to distribution capacity at the
Suite 102
minimum 20 psi residual pressure.
College Station, Texas 77840
Qr - _
0.54
PS Pr P.O. Box 10763, 77842
�t
P P
979.680.8840
where, Q = fire flow at residual pressure P (gpm) fax 979.680.8841
Q = hydrant discharge during test (gpm)
P = static pressure (psi)
Pr= desired residual pressure (psi)
P = residual pressure during test (psi) 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 205 Rock Prairie Road is
calculated to be approximately 6,003 gallons per minute from the hydrant test
data provided. The flow available with a 20 psi residual pressure at 209 Rock
Prairie Road is calculated to be approximately 5,194 gallons per minute from the
hydrant test data provided. Therefore, the proposed site should have adequate
fire flow for the proposed Stepping Stone School development.
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
Y Y O SA S E 9.F.T. h is
Melissa P. Thomas, P.E. ; *
MELISSA P. THOMAS
✓� -- I , o'; 98398
Kyle M. Zapalac, M.E., E.I.T tt�o,N.!cENsto. ��
t �
G Gessner Engineering
J Coiiege Station Utilities
Reliable, Affordable, Community Owned
Date test completed Monday June 20, 2011
Time completed 1:00 P.M.
Test completed by Vincent Rodriquez
Witness Justin Tamplin
FLOW HYDRANT
Location 205 Rock Prairie
Nozzle size 2.5
Hydrant number N -107
Pitot reading in PSI 60
Flow in G.P.M. 1300
STATIC HYDRANT
Location 209 Rock Prairie
Hydrant number N -106
Static PSI 88
Residual PSI 84
Comments Requested Flow
, .
al C oIIege Station Utilities
Reliable, Affordable, Community Owned
Date Wednesday April 14, 2010
Time 1:15 P.M.
Test
completed by Justin Tamplin
Witness Wyatt Jefferson
Location 209 Rock Prairie
Nozzle size 2.5
Flow hydrant N -106
Pitot reading 60
G.P.M. 1300
Static hydrant N -107
Static PSI 72
Residual PSI 68
Comments For Initial