Abstract: A fire extinguishing system for use especially on a floating roof tank includes an enclosure secured to the tank roof. The enclosure carries an agent tank, an expellant tank and an accumulator tank. The agent tank contains fire extinguishing agent and includes an expellant inlet and an agent outlet. The expellant tank contains pressurized expellant fluid. An expellant conduit extends from the expellant tank to the inlet of the agent tank. A sprayer duct is connected to the outlet of the agent tank and is arranged along one protected zone of the roof rim. A control valve is disposed in the expellant conduit. A flow control member is disposed in the expellant conduit upstream of the control valve for metering the rate of flow of expellant fluid. The accumulator communicates with the expellant conduit upstream of the control valve and downstream of the flow control member so that the accumulator is normally pressurized by the expellant tank.

Abstract: A sprinkler system having a pressurized sprinkler conduit which is separated from a water supply by a normally closed valve, and a fire alarm system having a circuit which is connected with this valve and opens the same in response to the detection of a fire by the circuit, is operated by detecting the absence of electrical energization of the fire alarm circuit, and thereupon operating the sprinkler system as a function of pressure losses in the sprinkler conduit rather than as a result of the operation of the fire alarm system.

Abstract: A combination air conditioning and fire protection system for a building including a heat exchanger through which fluid may pass under pressure, a fluid conditioning unit operable to bring fluid to a desired temperature for passing through the heat exchanger, and fluid supply and return conduits interconnecting the heat exchanger and fluid conditioning unit for circulating fluid therebetween. The supply and return conduits have discharge heads spaced therealong which are openable in case of fire to discharge fluid therefrom to extinguish a fire in the vicinity of the head. The conduits may include risers in the form of hollow, fluid-tight structural columns which also act to provide structural support for the building. Flow control devices and check valves in the system assure that pressure will be maintained in either the supply or return conduits to discharge fluid onto a fire if the other conduit is damaged and loses pressure.