to the sprinkler system demand [at the fire hydrant shown on the drawings
closest to the point where the water service enters the building] [at the
point of connection to the existing water system]. [An allowance for
interior hose stations of [_____] L/min gpm shall also be added to the
sprinkler system demand.]
1.2.1.2
Basis for Calculations
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NOTE: The design must include an adequate water
supply to meet the sprinkler water demand. The
designer must provide water flow test results and
hydraulic calculations to ensure that the system
demand will be met.
Design Calculations: The designer will provide
detailed hydraulic calculations that clearly
demonstrate that the water supply will meet the
demand of the sprinkler system and hose streams.
Calculations will be submitted with the concept
design submission.
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The design of the system shall be based on a water supply with a static
pressure of [_____], and a flow of [_____] at a residual pressure of
[_____]. Water supply shall be presumed available [at the point of
connection to existing] [at the base of the riser] [_____]. Hydraulic
calculations shall be based [upon the Hazen-Williams formula with a "C"
value of 120 for galvanized steel piping, 140 for new cement-lined
ductile-iron piping, and [100] [_____] for existing underground piping] [on
operation of the fire pump(s) provided in Section 13920 FIRE PUMPS].
1.2.2
Sprinkler Coverage
Sprinklers shall be uniformly spaced on branch lines. In buildings
protected by automatic sprinklers, sprinklers shall provide coverage
throughout 100 percent of the building. This includes, but is not limited
to, telephone rooms, electrical equipment rooms, boiler rooms, switchgear
rooms, transformer rooms, and other electrical and mechanical spaces.
Coverage per sprinkler shall be in accordance with NFPA 13, but shall not
exceed 9 square m 100 square feet for extra hazard occupancies, 12 square m
130 square feet for ordinary hazard occupancies, and 21 square m 225 square
feet for light hazard occupancies. Exceptions are as follows:
1) Facilities that are designed in accordance with NFPA 13R and NFPA 13D.
2) Sprinklers may be omitted from small rooms which are exempted for
specific occupancies in accordance with NFPA 101.
1.2.3
Control System
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NOTE: The drawings must show the following
information relative to the control and detection
system: preaction or deluge system control panel,
source of power for control panel, fire protection
valve actuation devices, detectors, manual actuation
stations, waterflow pressure switches, supervisory
switches; notification appliances; connection to the
SECTION 13945A
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