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NAVEDTRA 14324A MAG SPRINKS
Terms in this set (37)
A modern sprinkler system can wet down all bulkheads at a rate of _______ gallons per minute per square Ft, and can sprinkle the deck area at a rate of ______ gallons per minute per square ft.?
2 gallons, 4 gallons
Magazine sprinkler systems are designed to completely flood the spaces within______?
Describe a Dry-Type sprinkler system
A system in which the piping from the outlet side of the main sprinkler control valve up to the sprinkler heads contain no water in a normal or ready state.
the fusible link of HSD's melts at_____?
160 (+or - 3)
What size and type of transmission tubing is used?
1/8 inch OD rockbestos style
Valves are manufactured by which company?
CLA-VAL or Bailey
The main sprinkler control valve Is located?
Located inside or near magazine
The main sprinkler control valve is what type of valve?
A diaphragm- operated, normally closed, globe-type valve.
the bonnet chamber is raised or lifted by a min. of _________psi?
what provides a visual presentation of the magazine sprinkler control valve?
the valve stem
________ has to be installed before any maintenance is performed?
Water activated switches are located on what side of the main sprinkler control valve?
dry or downstream side
If salt water leaks by the main sprinkler control valve and alarm is activated where?
DC central on the FH ( water) circuit.
magazine sprinkler control valves are held closed by what?
the combined force of the valve spring and firemain pressure acting on top of the valve disk
Describe a manual control valve
rotary disk plate-type valve
A locking key is installed on control valve handles to prevent what?
accidental operation of the sprinkler system
the locking key is secured to the handle by __________, and fastened to the valve cover by means of a ______ _________?
single strand lead wire, safety chain
Describe a Hydraulically operated remote control valve
diaphragm- operated, globe type valve
what is the purpose of a hydraulically operated remote control valve?
permits the magazine sprinkler valve to be secured from an operating station other then the one which it was actuated.
Describe the Spring-Loaded Lift Check Valve
spring loaded diaphragm- operated lift check valve that closes tightly against reverse flow and opens wide to permit flow in normal direction
Purpose of a Spring loaded lift check valve
permits the control system to be operated form more then one control system by preventing back flow through other stations
Describe Hydraulically operated check valve
Normally closes, diaphragm operated, globe type check valve
What is the purpose of the hydraulically operated check valve?
permits the operating pressure to be vented from the diaphragm chamber of the magazine sprinkler valve thereby permitting that valve to close rapidly and completely.
what size are the orifice plates?
what is the purpose of orifice plates?
the primary purpose of the orifice plates is to prevent buildup of pressure in the control piping system as a result of leakage past a control system component.
where are HSD's mounted
on the overhead of protected spaces
what is the vented check valve?
Brass, spring loaded check valve, designed to check against a rapid change of air pressure in one direction and to open when air pressure is applied in other direction.
how many vented check valves per PRP?
maximum of 12 per PRP
What is the PRP Valve?
Pneumatically released pilot valve. normally closed spring -loaded pilot valve that opens automatically to actuate the magazine sprinkler system in response to a pneumatic signal.
What are the main components of the PRP valve?
Operating mechanism, compensating vent, and the pilot valve.
A circular bronze case houses what for the PRP?
the operating mechanism and the compensating vent
where is the Pilot Valve mounted on the PRP?
mounted on front of bronze case
the pilot valve is installed in a 3/8 inch line that connects the ______ to the __________.
fire main, sprinkler system hydraulic control system piping
what PSI is necessary to trip the PRP valve?
8 ounces PSI
what is the Magazine sprinkler systems pub?
what is FD alarm? how does it work?
Flooding alarm, as water accumulates on the deck the float rises meeting a set of contacts and sounding an alarm.
what is the F alarm?
when temps in ammo storage rise to 105EF
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