HomeMy WebLinkAboutFire Flow Analysis J
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F Flow Analysis Report
for
Varsity Ford = Building Addition
High Ridge Subdivision, Lot 1R
College Station, Texas
September, 2012
Prepared By:
Schultz Engineering, LLC
TBPE Firm Registration No. 12327
2730 Longmire, Suite A
College Station, Texas 77845 4031 of
979.764.3900
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F -12327
SCHULTZ ENGINEERING, LLC.
General Information
Location: Varsity Ford is located at 1351 Earl Rudder Freeway (S116) in College
Station, Texas.
General Note: The project has an eighteen inch waterline along the Earl Rudder
Freeway right of way and 8" water lines through the project that form a
loop. There are 2 existing fire hydrants at the site. One of these fire
hydrants will be relocated as a result of the proposed building addition.
The layout of the water system is shown on Exhibit A. Exhibit B is a
hydrant flow test on the existing water line.
Land Use: Commercial
Design Criteria /Analysis
Primary Water Supply: Existing 18" water line along the east side of Earl Rudder Freeway,
(SH6).
Domestic Demand:
Max. Demand Flow: 150 gpm (Assumed)
Fire Flow: All buildings are assumed to be Type IIB Construction.
A building addition is proposed for the Varsity Ford Development which will
include the addition of 884 SF of Office Space and 3,384 SF Service Area. This
building will connect to an existing building which is contains the office, parts
area, service shop and show room for Varsity Ford. According to the Site Plan
prepared by Fehr, Grossman, Cox Architects, Inc., dated 8 -3 -12, the total
building area, including the addition will be 41,491 SF. Assuming Type IIB
construction, in accordance with Table B105.1 of the International Fire Code, the
minimum required fire hydrant flow is 4,250 gpm for the site. All of the
buildings are and will be sprinkled, therefore, the hydrant flows are reduced by
50% to 2,125 gpm. For the computer modeling of the site, hydrant flow of 2,250
gpm was used. The required hydrant flow is split between 2 fire hydrants, 1,125
gpm at each hydrant, for the computer modeling analysis. A demand of 350 gpm
was used for the fire sprinlder system for the buildings.
The building addition will require the relocation of one of the existing onsite
hydrants. The location of the proposed hydrant is shown on Exhibit A and was
used in the computer modeling.
Existing System Pressure Tests:
Flow Hydrant: 1351 Earl Rudder Freeway — On 18" line
Flowrate: 1,455
Static Hydrant: Existing Hydrant within Site
Static Pressure: 98 psi
Residual Pressure: 96 psi
Exhibits: Exhibit A -- Water Layout
Exhibit B — Hydrant Flow Test
Appendix A — Pipe and Junction Analysis - Fire Flow Demand
Conclusion
The existing water lines and proposed hydrant are in accordance with the
BCS Water Design Guidelines. This report provides the results of the
water system analysis under the fire flow, ( hydrants and sprinklers), and
domestic peak demand for the commercial buildings. The lowest
residual pressure in the system with the fire flow and domestic demands
(2,750 gpm) is 90 psi. This pressure occurs with the required fire
hydrant flow of 2,250 gpm split between the 2 onsite hydrants. This
pressure exceeds the 20 psi minimum pressure requirement. The
maximum velocity in all pipes is less than 12 fps. The maximum
velocity in the system occurs in existing 8" pipe, P -1, 11.6 fps.
EXHIBIT A
Water Layout
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EXHIBIT B
Hydrant Flow Test
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College Station Utilities
Reliable, Affordable, Community Owned
Date test completed Thursday September 13, 2012
Time completed 8:30 A.M.
Test completed by Vincent Rodriquez
Witness Lawrence Chavarria /Floyd Anderson
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FLOW HYDRANT
Location 1351 Earl Rudder Frwvt
Nozzle size 2,,$
Hydrant number 0 -028
Pitot reading in PSI z¢
Flow in G.P.M.
STATIC HYDRANT
Location 1351 Earl Rudder Frwvt
Hydrant number G -031
Static PSI
Residual PSI la
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Comments Requested
•
APPENDIX A
Pipe and Junction Analysis — Fire Flow Demand
WaterCAD Analysis Summary
Junction Analysis - Fire Flow Demand (FH -1 & FH -2)
Junction
Junction Elevation
Demand Pressure
(gpm) (psi)
J -1 283.42 0 92.7
J -2 277.98 — 0 91.3
J -3 275.35 0 92.3
J -4 274.72 0 94
J -5 287.18 0 91.1
1 -6 288.31 0 90.6
— 1 -7 277 0 91.5
FH2 277 1,125 _ 91.3
FH1 277.98 1,125 91.2
J -10 278 _ 500 91.2
J -11 277.64 0 91.4
Exhibit C
WaterCAD Analysis Summary
Pipe Analysis - Fire Flow Demand (FH -1 & FH -2)
Pipe Hazen- Flow Velocity
Length (ft) Size (in) Material
Number Williams C (gpm) (ft /s)
P -1 202 8 PVC 150 1,819 11.61
P -4 467 8 PVC 150 -931 5.94
P -5 339 18 PVC 150 -931 1.17 _
P -6 294 18 PVC - -' 150 1,819 2.29
P -Res 24 18 PVC 150 2,750 3.47__
P -8 281 8 PVC 150 194 1.24
P -9 280 _ 8 PVC _150 - 931 5.94
P -10 31 8 PVC 150 1,125 _ 7.18
P -11 19 8 PVC 150 -1,125 7.18
P -12 23 8 PVC 150 694 4.43
P -13 154 8 PVC 150 194 1.24
P -14 22 8 PVC 150 -500 3.19
V IC Coflege Station Utilities
Reliable, Affordable, Community Owned
Date test completed Wednesday October 3, 2012
Time completed 9:30 A.M.
Test completed by Vincent Rodriquez
Witness Floyd Anderson/ Lawrence Chavarria
FLOW HYDRANT
Location Varsity Ford
Nozzle size 2.5
Hydrant number G -031
Pitot reading in PSI 70
Flow in G.P.M. 1405
STATIC HYDRANT
Location Ashley Furniture
Hydrant number G -118
Static PSI 106
Residual PSI 102 0
Comments Initial