HomeMy WebLinkAboutAddendum #2 to Fire Flow AnalysisVVe
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General Information
General Note: This addendum is to provide analysis of the proposed waterlines for the
TDI- Brooks International Center for the fire flow requirements.
Land Use: Commercial
Design Criteria /Analysis
Primary Water Supply: Existing 12" water line along IG &N Road.
Existing System
Pressure Tests:
Conclusion
The computer model output from the analysis performed by J.F. Fontaine
shows a pressure of 67.54 psi with the 2,500 gpm demand for the TDI-
Brooks International Center at the connection point to the proposed 12"
waterline. This residual pressure was used for this analysis.
Exhibits: Exhibit A — Proposed Waterline Layout
Exhibit B — Pipe & Junction Analysis — Fire Flow for Commercial
Building Use — 2,500 gpm
Exhibit C — Pipe & Junction Analysis — Fire Flow for Commercial
Building Use — 1,500 gpm
Domestic Use: 50 gpm assumed for the commercial building use.
The proposed 12" water line is in accordance with the BCS Water
Design Guidelines. This addendum provides the results of the water
system analysis under the fire flow conditions for commercial building
uses. A fire flow of 2,500 gpm was used for one scenario, 1,250 gpm
from each proposed hydrant. A fire flow of 1,500 gpm from a single fire
hydrant was used for the second scenario. The lowest residual pressure in
the system for a commercial building is 50.6 psi at 2,500 gpm and 52.6
psi at 1,500 gpm. Each of these pressures exceeds the 20 psi minimum
pressure requirement. The maximum velocity in all pipes is less than 12
fps for both scenarios. The maximum velocity in the 12" pipe will be
7.23 with a fire flow of 2,500 gpm.
I MO
1
1
Pipe
Number
- 'r- - --- - -• ---
Length (ft)
Size (in)
Material
Hazen-
Williams C
Flow
(gpm)
Velocity
(ft/s)
P -3
446
12
PVC
150
1,300
3.69
P -4
20
12
PVC
150
1,250
3.55
P -5
25
12
PVC
150
0
0
P -6
22
12
PVC
150
-2,550
7.23
P -7
764
12
PVC
150
2,550
7.23
y
Total
Elevation Demand Pressure
Junction (ft) (gpm) (psi)
J -1 307.06 0 67.1
PROPOSED FH1 333.26 1,250 52.1
J -4 335.32 50 50.6
PROPOSED FH2 335.25 1,250 50.6
J -6 335.16 0 50.7
Exhibit B
WaterCAD Analysis Summary
- Fire Flow for Commercial Use - 2,500 gpm
Exhibit B
WaterCAD Analysis Summary
Junction Anal sis - Fire Flow for Commercial Building Use - 2,500 gpm
Exhibit B
WaterCAD Analysis Summary
- Fire Flow for Commercial Use - 2,500 gpm
Exhibit B
WaterCAD Analysis Summary
Junction Anal sis - Fire Flow for Commercial Building Use - 2,500 gpm
Pipe
Number
Length (ft)
Size (in)
Material
Hazen-
Williams C
Flow
(gpm)
Velocity
(ft /s)
P -3
446
12
PVC
150
1,550
4.4
P -4
20
12
PVC
150
1,500
4.26
P -5
25
12
PVC
150
0
0
P -6
22
12
PVC
150
-1,550
4.4
P -7
764
12
PVC
150
1,550
4.4
Junction
Elevation
(ft)
Total
Demand
(gpm)
Pressure
(psi)
J -1
307.06
0
67.2
PROPOSED FH1
333.26
0
54.4
J -4
335.32
50
52.6
PROPOSED FH2
335.25
1,500
52.6
J -6
335.16
0
52.7
Exhibit C
WaterCAD Analysis Summary
- Fire Flow for Commercial Building Use -1,500 gpm
Exhibit C
WaterCAD Analysis Summary
Junction
Addendum 2 to
Fire Flow Analysis Report
for
TDI- Brooks International Center
College Station, Texas
August, 2011
Prepared Bv:
Schultz Engineering, LLC
TBPE Firm Registration No. 12327
2730 Longmire, Suite A
College Station, Texas 77845
979.764.3900
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JOSEPH P sCI
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SCHULTZ ENGINEEBING LLC.
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