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 upon 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
System Volume Limitations
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NOTE: Designer must ensure by calculation that a
sufficient number of systems is provided to limit
piping volume to less than 2800 liters (750 gallons).
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Where the volume of any individual system piping volume exceeds 1890 liters
500 gallons the dry pipe valve shall be provided with a quick-opening
device. The maximum system capacity controlled by one dry pipe valve shall
not exceed 2800 liters 750 gallons. The calculated volume of each system
shall be indicated on the Sprinkler System Shop Drawings.
1.3
COORDINATION OF TRADES
Piping offsets, fittings, and any other accessories required shall be
furnished as required to provide a complete installation and to eliminate
interference with other construction. Sprinkler shall be installed over
and under ducts, piping and platforms when such equipment can negatively
effect or disrupt the sprinkler discharge pattern and coverage.
SECTION 13935A
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