Term
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Definition
| Standard for Installation of Sprinkler Systems |
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Term
| Clearance between sprinklers and stored materials |
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Definition
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Term
| Situations where sprinklers are effective |
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Definition
Discharges water on fire while it is still relatively small
Prevents fire from spreading upwards in multistory buildings
Protecting the lives of occupants in other parts of the building |
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Term
| Situations where sprinklers are NOT effective |
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Definition
Fires too small to activate sprinkler system
Smoke generation reaches occupants before the sprinkler system activates
Sleeping, intoxicated or handicapped persons occupy the building |
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Term
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Definition
| vertical water pipe used to carry water for fire protection systems above ground such as a standpipe riser or sprinkler riser |
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Term
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Definition
| pipe connecting the riser to the cross mains |
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Term
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Definition
| directly service a number of branch lines on which the sprinkler systems are installed |
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Term
| Three types of sprinklers |
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Definition
| fusible link, fragile bulb, and chemical pellets |
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Term
| Uncolored or black sprinklers |
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Very Extra High; 400-475 F |
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Term
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Definition
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Term
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Definition
| MOST COMMON, extends downward from piping |
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Term
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Definition
screwed into the top of the piping, redirected to the floor
cannot be inverted |
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Term
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Definition
| extends from the side of the pipe; used in small rooms; fan-shaped pattern of water |
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Term
| Special-purpose sprinklers |
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Definition
| used for specific applications (corrosive atmospheres, blends in with room decor, etc) |
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Term
| Sprinkler storage cabinent |
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Definition
| installed near the sprinkler riser and main shut-off; hold a minimum of six sprinklers and a sprinkler wrench |
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Term
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Definition
used to turn off the water supply in order to replace sprinklers, maintenance, or interrupt operations
chained into open position or electronically supervised to prevent tampering |
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Term
| OS&Y valve (outside stem and yoke) |
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Definition
yoke on the outside with a threaded stem that opens and closes the gate inside the valve housing
threaded portion of stem is visible beyond the yoke when the valve is open and not visible when the valve is closed |
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Term
| PIV (Post Indicator valve) |
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Definition
| hollow metal post that house the valve stem; indicates OPEN and SHUT through a windows; operating handle is locked to the valve housing |
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Term
| WPIV (wall post indicator valve) |
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Definition
| similar to a PIV except that it extends horizontally through the wall with target and valve operating nut on the outside of the building |
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Term
| PIVA (Post Indicator valve assembly) |
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Definition
Uses a circular disk instead of a PIV's OPEN and SHUT.
Valve open = disk is perpendicular
Valve is closed = disk is in line
operated by a built in crank |
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Term
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Definition
| located on a pipe that connects the supply side of the alarm check valve to the retard chamber; simulates the actuation of the system by allowing water to flow into the retard chamber and operate the waterflow alarm devices |
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Term
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Definition
| on a remote part of the system; simulates the activation of one sprinkler; normally discharges outside the building |
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Term
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Definition
| allow sprinkler service personnel to drain water from the system for maintenance purposes; can also be used to check the system water supply |
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Term
| Minimum water supply in sprinkler |
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Definition
| Has to deliver the required volume of water to the highest sprinkler in the building at a residual pressure of 15psi |
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Term
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Definition
consists of a siamese with at least two 2 1/2 inch female connections with a clapper, or one large-diameter with a clappered inlet
should be supplied with water from pumpers that have a capacity of at least 1,000 gpm or greater, and a minimum of two 2 1/2 attached to FDC |
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Term
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Definition
used in locations where temps below 40 are not expected
simple, requires little maintenance
may have an alarm check valve or a backflow prevention on a straight stick system
may be equipped with a retard chamber that catches excess water sent through the alarm valve during pressure surges |
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Term
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Definition
used in locations where piping may be subjected to temps below 40
all pipes are pitched to drain water back towards the main drain
air under pressure replaces water in the sprinkler above the dry-pipe valve; when sprinkler fuses, the pressurized air escapes, then water follows; air pressure is usually about 20psi above trip pressure
quick-opening device required in systems of a water capacity over 500 gallons |
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Term
| Preaction sprinkler systems |
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Definition
dry systems that employee a deluge-type valve; used when it is especially important to prevent water damage
will not discharge water except in response to smoke or heat system actuation |
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Term
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Definition
similar to dry-pipe, but there are no fusible links and they do not function as fire detection
all sprinklers are open all the time, other fire detection devices activate water supply
high-hazard occupancy such as aircraft hangers; sometimes also discharge foam |
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Term
| Residential sprinkler systems |
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Definition
| employee quick-release sprinklers; must have a pressure gauge, a flow detector, and a means for testing and draining |
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