Sprinkler Systems question & answers rated A+ 2023 graded A+

Sprinkler Systems question & answers rated A+ 2023 graded A+ Automatic Sprinkler System - correct answer System of water pipes, discharge nozzles, and control valves designed to activate during fires by automatically discharging enough water to control or extinguish a fire. riser - correct answer A water supply pipe that extends vertically one story or more to carry water to fixtures. feed main - correct answer the pipe connecting the riser to the cross mains. cross main - correct answer Pipe connecting the feed main to the branch lines on which the sprinklers are located Fusible Link - correct answer Connecting link device that fuses or melts when exposed to heat; used in sprinklers, fire doors, dampers, heat detectors, and ventilators. Frangible Bulb - correct answer Small glass vial fitted into a detector or sprinkler. The glass vial is partly filled with a liquid that expands as heat increases. At a predetermined temperature, vapor pressure causes the glass bulb to break, which activates the device. chemical pellet - correct answer A pellet of solder, under compression, within a small cylinder, that melts at a predetermined temperature, allowing a plunger to move down and release the valve cap parts. Outside Stem and Yoke (OS&Y) Valve - correct answer Outside stem and yoke valve; a type of control valve for a sprinkler system in which the position of the center screw indicates whether the valve is open or closed. Threaded portion visible when open Post Indicator Valve (PIV) - correct answer Hollow metal post that houses the valve stem. Open and Shut visible through small glass) Wall post indicator valve (WPIV) - correct answer similar to the PIV except that it extends horizontally through the wall with the target valve operating nut on the outside of the building. Post Indicator Valve Assembly (PIVA) - correct answer does not use a plate with words open or shut. Uses circular disk inside a flat plate on top of the valve housing. when open, disk is perpendicular Wet Pipe Sprinkler System - correct answer Automatic fire sprinkler systems with pipes that always contain water under pressure, which is released immediately when a sprinkler head opens