HomeMy WebLinkAboutFire Flow Water AnalysisGALINDO ENGINEERS AND PLANNERS, INC.
3833 South Texas Ave., Suite 213 Bryan, Texas 77802 (979) 846-8868
1. FIREFLOW ANALYSIS
FIRE FLOW WATER ANALYSIS
301 & 303 COLLEGE MAIN
26-08
The fire flow analysis for this fire hydrant and water line used an assumed pressure value of 65 psi in the
existing 12" water line along College Main. The analysis was made using the Hazen-Williams equation with a
coefficient of 140.
1.1 . FIRE FLOW ANALYSIS AT EXISTING FIRE HYDRANT:
The fire flow requirements were obtained from the 2006 City of College Station Design Standards:
Address
301 College Main
303 College Main
Type of Construction
Type IB
Type VB
Total Required Fire Flow:
3,000 gpm
Floor Area
9,250 s.f.
3,000 s.f.
Required Fire Flow
1,500 gpm
1,500 gpm
Credit currently envisioned by City of College Station due to sprinkling of the buildings is 50%. Therefore the
required fire flow is 1,500 gpm.
Thus the flow characteristics of the existing fire hydrant at the corner of College Main and Church Avenue as
shown on Exhibit 1 are:
Q Length Elev Diam p v
gQ!D_ ft ft in Illi ~
0 0 65.00
1,500 5 5 12 ~2.821 4.26
1.2. FIRE FLOW REQUIREMENTS FOR PROPOSED SPRINKLER SYSTEM:
Building One (301 College Main):
Construction Material:
Non-combustible, metal structure, load bearing walls.
Floor Area:
First floor area =
Second floor area =
Total floor area =
Light Hazard Occupancy
5,650 s.f.
3,600 s. f.
9,250 ~
.1
Building Two (303 College Main):
Construction Material:
Non-combustible, wood frame, non-load bearing walls.
Floor Area:
Total floor area =
Light Hazard Occupancy
Fire flow for Light Hazard Occupancy = 300 gpm per building.
3,000 s.f.
The total maximum demand at the end of the proposed 8" fire line is calculated as
300 gpm x 2 = 600 gpm
The flow characteristics at the end of the proposed 8" water line as shown Exhibit 2 are:
600
Length
ft
0
35
Elev
f!
0
0
Diam
in
8
p
~
65.00
~4.911 3.83
Thus under the conditions of this analysis the minimum residual pressure at the end of the proposed 8" line
would be 64. 91 psi, and the velocity would be 3.83 fps.
,l
Pressure Pipe Analysis & Design
Circular Pipe
Worksheet Name: FIRE FLOW ANALYSIS
Connnent: Existing Fire Hydrant
Solve For Pressure @ 2
Given Input Data:
Elevation@ 1 .... .
Pressure@ 1 ..... .
Elevation@ 2 .... .
Discharge ........ .
Diameter ......... .
Length ........... .
Hazen-Williams C ..
Computed Results:
Pressure@ 2 ..... .
Velocity ......... .
Headless ......... .
Energy Grade@ 1 ..
Energy Grade@ 2 ..
Friction Slope ....
0.00 ft
65.00 psi
5.00 ft
1500.00 gpm
12.00 in
5.00 ft
140.00
62.82 psi
4.26 fps
0.02 ft
150.24 ft
150.21 ft
4.685 ft/1000 ft
Open Channel Flow Module, Version 3.21 (c) 1990
GXH!/517 J
Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708
.•
Pressure Pipe Analysis & Design
Circular Pipe
Worksheet Name: FIRE FLOW ANALYSIS
Comment: End of Proposed 8" Fire Line
Solve For Pressure @ 2
Given Input Data:
Elevation@ 1 .... .
Pressure@ 1 ..... .
Elevation@ 2 .... .
Discharge ......... .
Diameter ......... .
Length ........... .
Hazen-Williams C ..
Computed Results:
Pressure@ 2 ..... .
Velocity ......... .
Headless ......... .
Energy Grade@ 1 ..
Energy Grade@ 2 ..
Friction Slope ....
0.00 ft
65.00 psi
0.00 ft
600.00 gpm
8.00 in
35.00 ft
140.00
64.91 psi
3.83 fps
0.22 ft
150.18 ft
149.97 ft
6.186 ft/1000 ft
Open Channel Flow Module, Version 3.21 (c) 1990
£XI-I/Sii 2.
Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708