HomeMy WebLinkAboutWater Line Design & Fire Flow AnalysisWater Line Design Report
Fire Flow Analysis
for
Foster Avenue Apartments
College Station, Texas
August 2012
Revised September 2012
Revised October 2012
Prepared Bv:
Schultz Engineering, LLC
TBPE Firm Registration No.12327
2730 Longmire, Suite A
College Station, Texas 77845
979.764.3900
F-12327
SCHULTZ ENGINEERING, LLC.
/2
General Information
Location: The Foster Avenue Apartments are located at 1024 & 1026 Foster
Avenue at its intersection with Francis Drive.
General Note: The proposed 6" waterline will connect to the existing 8" waterline along
Francis Drive.
Land Use: Multi -Family Residential
Design Criteria/Analysis
Primary Water Supply: Existing 8" water line along Francis Drive.,
Existing System Pressure Tests: (See Exhibit B)
Flow Hydrant —Existing Hydrant at 203 Francis
Flowrate: 1,350 gpm
Static Pressure: 90 psi
Residual Pressure: 88 psi
Fire Hydrant Flow: The proposed structure will be a 4-story multi -family residential building
(27,806 SF) and is proposed to be Type V-A construction per the
International Building Code. The hydrant flow requirement for the
building in accordance with Table B105.1 of the International Fire Code
is 3,000 gpm. The hydrant flow for the building was reduced by 50%
due to the sprinkler system proposed for this structure. The hydrant flow
for the building is 1,500 gpm.
A hydrant flow of 1,500 gpm requires one hydrant per Table C105.1 of
the International Fire Code. The existing hydrant at the intersection of
Francis Drive and Foster Avenue can serve this project. However, this
hydrant is not within 150' of th FDC, (Fire Department Connection), for
the building. Therefore, a hydrant is being added in the location shown
on Exhibit A which will connect to the existing eight inch water line
along Francis Drive.
Domestic Use The domestic demands were calculated using the Fixture Count
Determination method peak demand of 79 gpm. These calculations are
included in Appendix A. A 2" water meter is required and the domestic
water service line to the building will be a 2" pipe.
Fire Sprinkler System Afire sprinkler system demand of 150 gpm is assumed for this project.
The supply line to the building will be a 4" pipe.
Water System Analysis:
Exhibit A shows the layout of the proposed waterline and hydrants. A
short section of 6" pipe will be installed for the proposed hydrant, fire
sprinkler supply line and domestic service. The proposed 6" water line is
in accordance with the BCS Water Design Guidelines.
Since there are 2 hydrants available to serve this building, the 1,500 gpm
will be split between the hydrants with each having a flow of 750 gpm.
The peak demand on the proposed 6" waterline will be 979 gpm. The
residual pressure in the existing 8" waterline with this demand and 750
gpm on the existing hydrant, (total demand of 1,729 gpm), will be 86 psi.
The maximum velocity in the 6" pipe is 11.5 fps which is less than 12
fps. The residual pressure under domestic peak demand will be 88 psi.
Each of these pressures exceed the 20 psi and 35 psi minimum pressure
requirements, respectively.
Appendices: Appendix A — Water System Peak Flow Calculations — Fixture Count
Determination
Exhibits: Exhibit A— Water Layout
Exhibit B — Fire Hydrant Test Report
Conclusion
The proposed public water lines meet or exceed all of the design criteria
for the City of College Station. It will provide adequate water pressure
and flowrate for domestic and fire flow demands.
Appendix A
Water System
Peak Flow Calculations
Fixture Count Determination for Overall System
Foster Avenue Apartments
Fixture Unit Value
Fixture Type # of Fixtures Load Factor Fixture Units
Bathroom Group - Private
40
3.6
144
Kitchen Sink - Private
18
1.4
25.2
Lavatory - Private
18
0.7
12.6
Water Closet - Private Tank
18
2.2
39.6
Dishwashing Machine
18
1A
25.2
Washing Machine - Private
18
1.4
25.2
Total = 271.8
Water Demand - 79 gpm
Exhibit B
4 I(f College Station Utilities
Reliable, Affordable, Community Owned
Date test completed Wednesday May 16, 2012
Time completed
Test completed by
3:00 P.M.
Justin Tamplin
Comments Requested
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