Good Morning and Happy New Year!
I 'm hoping you are able to assist me in answering some sprinkler/fire
pump questions ( I know you have the expertise). The word file is
attached. Many thanks in advance and warm regards.
Jaber M. Al-Haji
[EMAIL PROTECTED]
1) Given that a fire pump is required to serve the sprinkler system in a
building and the pump is skid mounted pre-packaged fire pump system
designed for the required sprinkler flow. The package will include the
fire pump, jockey pump, controllers, backflow preventer and
interconnecting piping and valuing. Arrangement and piping is per NFPA
20. The system is assembled and pre-piped at the factory and shipped on
a steel frame base. All components are UL/FM approved.
Backflow preventer questions.
A. Backflow Prevention for Fire Pump.
( ) No backflow valve required
( ) Backflow valve required
B. Backflow preventer location in relation to fire pump suction
and discharge
( ) On discharge side of pump per NFPA 20 (Preferred arrangement)
( ) On suction side of pump inside building. (Contrary to NFPA 20
but may be required by water utility)
( ) Outside the building in pit or above grade.
C. Backflow preventer orientation for backflow preventer located
on suction side of pump (some jurisdictions have strict requirements
about how the backflow preventer is oriented):
( ) Horizontal
( ) Vertical (preferred)
Note: If a Reduced Pressure Zone valve is required on suction side of
pump, is vertical installation acceptable?
2) Fire Pump Accessory Questions: Are any of these accessories typically
required?
A. Pump Suction Control Valve: This valve senses the suction
pressure and throttles down the supply to ensure that the suction
pressure does not drop below 20 psi. Target, NFPA and FM prefer not to
have this option on fire pumps because it may limit the water available
to the sprinkler heads. This is a requirement in some jurisdictions to
attempt to protect the city water mains from stress under low pressure.
( ) Not required
( ) Required
B. Low Suction Shut-Off Panel: This panel shuts down the fire
pump if the suction pressure drops below 20 psi. Target, NFPA, FM
strongly prefer not to have this option on fire pumps for the reason
that the fire pump could shut down in a fire situation. This is a
requirement in a select few jurisdictions (primarily WI, IL, IN, OH, MI)
to protect the city water mains from stress under low pressure.
( ) Not required
( ) Required
C. Emergency power backup required for electrical fire pump.
( ) Not required
( ) Required
Remarks: If emergency power is required, the emergency generator will
be sized to handle the fire pump load. Coordinate requirement for
generator size and reduced voltage starting requirements.
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