HomeMy WebLinkAboutFire Flow Letter A&M Consolidated Gym Expansion
Fire Flow Letter
March 4, 2015
Background
College Station Independent School District is constructing a gym expansion on the A&M Consolidated
High School campus.This expansion consists of an addition to the existing gymnasium along with
additional men's and women's restrooms and a new dance gym. A site plan showing this expansion is
attached as Exhibit 1.
Fire Flow Area& Required Fire Flow
Per the 2012 International Fire Code (IFC) Section B104— Fire Flow Calculation Area, the High School
currently has a maximum fire flow area of 145,024 square feet. With the new gym expansion that area
increases to 154,700 square feet or an increase in fire flow area of 9,767 square feet. The building type
for the High School is Type IB. According to Table B105.1 the required fire flow for 145,024 square feet
protected by a fire sprinkler system is 4,000 gpm and with a 50% reduction would be 2,000 gpm. The
required fire flow for 154,700 is 4,250 gpm with a 50% reduction would be 2,125 gpm, or an increase of
125 gpm from the fire flow requirement for this existing structure.
Required Number of Fire Hydrants
According to Section C103 of the IFC both of these fire flows require only 2 hydrants available for this
structure. If 2 hydrants are used for this area of the building, each hydrant would have to flow 1,063
gpm. If 3 hydrants are used for this area of the building, each hydrant would have to flow 709 gpm. As
seen on Exhibit 2 there are 3 fire hydrants in proximity to this new expansion.
Fire Flow Model
To investigate the ability for the existing water supply system to provide this required fire flow we ran
the current City of College Station water supply model under average day conditions with fire flows of
1063 gpm on nodes 1540 and 1567 in the model. A graphic representation of the model layout and
these nodes is shown in Exhibit 2. The results of placing this fire flow on these 2 hydrants nodes can be
seen in Exhibit 3. As seen,the existing system can accommodate the fire flow required for this building
expansion with meeting a minimum pressure of 20psi and a maximum line velocity at or below 12 fps.
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EXHIBIT 2
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A&M Consolidated High School Gym Expansion Exhibit 2