Pre-Action System Sample Clauses

Pre-Action System. The design shall be a complete hydraulically designed pre-action sprinkler system which complies with NFPA 13, 24, 26, 70, 72, 72E, and 72G, ANSI, ASTM, AWS, and MSS. The safest type of pre-action system for communication equipment is a Double-Interlocked System. This type of system requires the activation of both detection system and a sprinkler head before allowing water to flow into the sprinkler system piping. This will protect against accidental discharge of water. The A/E design should provide for a deluge valve, check valve with rubber seat, main water supply control valve with tamper switch, alarm pressure switch, air pressure supervisory switch and all trim valve gages and components all located within the hub. The deluge valve should be electronically operated. The sprinkler system shall be supervised with a air compressor and air maintenance device. Include a pre-action releasing panel for operation of the pre-action system. The control unit shall be UL Listed per Standard 864 for pre-action and the solenoid shall be listed for use with the panel. The control panel shall have the capacity for at least two initiative device circuits and inputs from flow, low air and tamper switches. The control panel shall also have the capacity for two output circuits for trouble and supervisory signals to building fire alarm system. The alarm notification to the building shall be from the alarm pressure switch. All initiating circuits from the panel shall be Style D. The panel shall have backup battery and charger for continuous operation of system for 24 hours. The pre-action system shall include a detection and control system for solenoid valve operation on the preaction valve. The detection circuits shall be obtained from the release panel. Valves controlling sprinklers or water supplies shall be listed OS&Y gate valves or butterfly valves suitable for the service indicated. Where butterfly valves are used, they shall be lug type flanged or grooved so that piping can be disconnected on one side of the valve and the valve still hold pressure. All valves shall be provided with listed tamper switches with both normally open and normally closed contacts.
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