Screw Threads (NH) per NFPA 1963.
2.12
BASKET STRAINER
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NOTE: Strainers are generally not required on
systems utilizing only wet-pipe sprinklers.
Indicate strainer size and friction loss limits
based upon specific design.
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Unit shall have cast iron flanged body and cover flanges. The strainer
basket shall be formed of perforated brass or stainless steel sheet with 6
mm 1/4 inch perforations. Strainer size shall be [_____] mm inch and shall
have a maximum friction loss of [_____] kPa psi at a flow rate of [_____]
L/second gpm. Assembly shall allow access to the strainer basket by
removing the flange on the top of the strainer.
2.13
REDUCED PRESSURE BACKFLOW PREVENTION ASSEMBLY
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NOTE: Backflow preventers are not required in
systems supplied by dedicated fire protection
storage and pumping facilities. Where systems are
supplied from domestic water systems, reduced
pressure type backflow preventers are required and
must be located on the discharge side of booster
fire pumps directly supplying the system.
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The unit shall be capable of preventing backsiphonage and back pressure
backflow from the fire protection system into the potable water system.
The assembly shall include a pressure differential relief valve located in
a zone between two positive seating check valves. The assembly shall
include resilient seated outside stem and yoke (OS&Y) gate valves upstream
and downstream of the valve and test cocks. Main valve body shall be
ductile iron with fused bonded epoxy coating. The assembly shall comply
with ASSE 1013 and be listed in UL Fire Prot Dir or FM P7825a.
2.14
DISCHARGE DEVICES
2.14.1
Sprinkler
Sprinkler shall be 13 mm 1/2 inch orifice spray type. For deluge systems,
sprinkler shall be open type without heat responsive and actuating
elements. For wet-pipe or preaction systems, sprinkler shall be upright
type with [standard response] [quick response] glass bulb heat responsive
and actuating element having a temperature rating of [79 degrees C 175
degrees F] [_____]. Spare sprinklers in accordance with NFPA 13 shall be
housed in metal or plastic containers.
2.14.2
Fixed Nozzle
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NOTE: Verify availability of nozzles required to
meet design flows and pressures as needed to achieve
nozzle coverage indicated on the drawings.
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SECTION 13955A
Page 17
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