Abstract:
A fire extinguishing system for low temperature environments in which a network of pipes are supported in an elevated position in the space to be protected and are connected to a source of extinguishant. A plurality of thermally operable extinguishant discharge heads are connected to the network of pipes and are adapted to open in response to a predetermined fire condition in the space. A control valve normally prevents the flow of extinguishant to the network of pipes, and is responsive to the opening of one or more of the heads for permitting the flow of extinguishant to the network of pipes. One or more common drain lines are connected to the pipes in the network for permitting the flow of extinguishant through all of the pipes upon the opening of one or more of the heads.