An air maintenance device for a dry pipe Fire Protection System (FPS) is capable of measuring an FPS piping network pressure leak rate. The air maintenance device includes a normally-open solenoid isolating it from all gas sources, and a pressure sensor in gas flow communication with the FPS piping network. An electronics module initiates a pressure leak rate measurement operation by reading the pressure sensor, and closing the solenoid, at the beginning of a predetermined duration. At the expiration of the predetermined duration at least a final pressure reading is taken, and the solenoid is opened. A FPS piping network pressure leak rate is calculated by subtracting the final pressure reading from the initial pressure reading, and dividing by the predetermined duration. If intermediate readings indicate a pressure below a threshold, the measurement is aborted and the solenoid is opened to allow the gas sources to maintain system pressure.

A fire suppression system in which side-discharge fire sprinklers are fitted to opposite sides of a supply line and aimed so that their coverage areas point in opposite directions. The fire sprinklers are alternated on left and right-hand sides of the supply line, and are spaced apart at a consistent interval. Each fire sprinkler includes a deflector configured to disperse the outflow of water over a non-circular coverage area. When two supply lines are installed next to each other so that half of the sprinklers on one supply line point toward the other supply line, and vise versa, the fire sprinklers are staggered so that their respective coverage areas are interlaced in the intermediate space.

A fire suppression system in which side-discharge fire sprinklers are fitted to opposite sides of a supply line and aimed so that their coverage areas point in opposite directions. The fire sprinklers are alternated on left and right-hand sides of the supply line, and are spaced apart at a consistent interval. Each fire sprinkler includes a deflector configured to disperse the outflow of water over a non-circular coverage area. When two supply lines are installed next to each other so that half of the sprinklers on one supply line point toward the other supply line, and vise versa, the fire sprinklers are staggered so that their respective coverage areas are interlaced in the intermediate space.

A pressure maintenance device is connected to a fire protection sprinkler system having downstream piping that is exposed to freezing temperatures, and supplies a pressurized fluid to the downstream piping when the sprinkler system is in an inactivated state. When an outlet pressure sensor near an outlet of the pressure maintenance device detects that a pressure of the pressurized fluid downstream of an outlet regulator falls below a first predetermined pressure, the pressure maintenance device supplies the pressurized fluid in a primary supply mode or a secondary supply mode. The pressure maintenance device automatically switches from the primary supply mode to the secondary supply mode if a supply pressure sensor detects that a pressure of the pressurized fluid downstream of a first pressurized fluid valve, and upstream of the outlet pressure regulator, falls below a second predetermined pressure.

A fire suppression system for stoves is shown and described. The fire suppression system for stoves includes a first pressurized tank filled with a fire suppression material. The first pressurized tank is fluidly connected to a first side of a piping system. A second pressurized tank filled with a fire suppression material. The second pressurized tank is fluidly connected to a second side of a piping system. The piping system has a plurality of nozzles pointing at burners of a stove. A first temperature gauge is connected to a first release device. The first release device will dispense the fire suppression material from the first pressurized tank. A second temperature gauge is connected to a second release device. The second release device will dispense the fire suppression material from the second pressurized tank.

A fire suppression system for stoves is shown and described. The fire suppression system for stoves includes a first pressurized tank filled with a fire suppression material. The first pressurized tank is fluidly connected to a first side of a piping system. A second pressurized tank filled with a fire suppression material. The second pressurized tank is fluidly connected to a second side of a piping system. The piping system has a plurality of nozzles pointing at burners of a stove. A first temperature gauge is connected to a first release device. The first release device will dispense the fire suppression material from the first pressurized tank. A second temperature gauge is connected to a second release device. The second release device will dispense the fire suppression material from the second pressurized tank.

A sprinkler assembly that includes a deflector assembly that translates with respect to the sprinkler frame upon actuation of the sprinkler from an unactuated state. The sprinkler frame includes a support member having an annular member spaced from the outlet to limit or control the axial translation of the deflector assembly relative to the outlet. Moreover, the annular member includes a region to support a closure assembly and thermally responsive trigger assembly under a fluid static load. A cover plate assembly includes a flexible annular wall to allow the cover plate assembly to be pushed on and held about the annular member of the sprinkler frame.

A sprinkler assembly that includes a deflector assembly that translates with respect to the sprinkler frame upon actuation of the sprinkler from an unactuated state. The sprinkler frame includes a support member having an annular member spaced from the outlet to limit or control the axial translation of the deflector assembly relative to the outlet. Moreover, the annular member includes a region to support a closure assembly and thermally responsive trigger assembly under a fluid static load. A cover plate assembly includes a flexible annular wall to allow the cover plate assembly to be pushed on and held about the annular member of the sprinkler frame.

A valve assembly includes a pipe fitting through which a gas is configured to flow. The inlet of the pipe fitting is configured to connect to an open port of a fire suppression sprinkler system so that gas flows from the fire suppression sprinkler system into the pipe fitting. The valve assembly also includes a vent valve. The inlet of the vent valve is connected to the outlet of the pipe fitting. The vent valve is operable to move between an open position and a shut position. The valve assembly includes an inert gas analyzer and at least one vent port upstream of the inert gas analyzer. The inert gas analyzer is positioned to measure the inert gas content of gas flowing in front of the inert gas analyzer and through the vent port to an outside environment.

A wet pipe fire protection sprinkler system and method of operating a wet pipe fire sprinkler system includes providing a sprinkler system having a pipe network, a source of water for the pipe network, at least one sprinkler head connected with the pipe network and a drain valve for draining the pipe network. An inert gas source, such as a nitrogen gas source, is connected with the pipe network. Inert gas is supplied from the inert gas source to the pipe network. Water is supplied to the pipe network thereby substantially filling the pipe network with water and compressing the inert gas in the pipe network.