A foam production method includes mixing liquid nitrogen with a foaming material to produce foam. A gas is produced in situ from liquid nitrogen. As the ratio of the volume of the gas produced by gasification of liquid nitrogen to the volume of the liquid nitrogen is relatively high, when a large gas supply flow is needed to generate a large foam flow, a liquid nitrogen storage device of a small volume can be used instead of bulky air supply devices such as high-pressure gas cylinders, air compressors, air compressor sets and the like, reducing the volume of the air supply device. In addition, the liquid nitrogen used in foaming will release nitrogen gas after the foam blast, such that the nitrogen is also able to inhibit combustion on the surface of burning materials, accelerating the extinguishing of the fire.

This relates to apparatus that can form dilute aqueous firefighting compositions from an aqueous concentrate.

An admixing system for fire-extinguishing installations is provided for generating a mixture (premix) of extinguishing medium and extinguishing medium additive by admixing an extinguishing medium additive to an extinguishing medium. The admixing system has a motor that can be driven by a flow of extinguishing medium, an admixing pump that is connected to the motor and serves for supplying the extinguishing medium additive to an extinguishing medium additive inlet line, an admixing line, and an extinguishing medium additive outlet line from which the extinguishing medium additive is admixed to the extinguishing medium in the admixing line. The admixing pump is a piston pump having multiple cylinders and at least two outputs connected to the cylinders. At least one first output, through which return flow is possible, can be switchably fluidically connected either to a return flow line through which the extinguishing medium additive flows back to the admixing pump, or to the extinguishing medium additive outlet line. If the extinguishing medium additive flows from the return-flow-compatible output back to the admixing pump, it is therefore not admixed to the extinguishing medium in the admixing line. Thus, the admixing rate can be changed simply by means of this switching.

Disclosed is a fire suppressant system for an aircraft having: a source of a fire suppressant; a tubing system for delivering the fire suppressant to one or more predetermined locations; and a discharge nozzle disposed in the one or more predetermined locations, the discharge nozzle connected to the tubing system for distributing the fire suppressant in the one or more predetermined locations during a fire, the discharge nozzle including a plurality of nozzle heads including a first nozzle head with a first flow area and a second nozzle head with a second flow area that differs from the first flow area.

The present invention refers to a method and system for ejecting carbon dioxide as High-Speed Jets with Sublimation. More specifically, the present invention describes a method and system capable of controlling and extinguishing fires from the CO.sub.2 ejected. In summary, the proposed method comprises the steps of removing CO.sub.2 in a first state (G) from the storage medium (2) and inserting the CO.sub.2 in first state (G) in the driver set (3); maintaining the insertion of CO.sub.2 in first state in the driver set (3) up to the equalization of the internal pressure between the storage medium (2) and the driver set (3); removing carbon dioxide in a second state (L) from the storage medium (2) and inserting the carbon dioxide in second state in the driver set (3) after the equalization of the pressure of the storage medium (2) and of the driver set; ejecting the CO.sub.2 in the form of high-speed jets with high content of CO.sub.2 in third state (S) through the driver set (3).

A “FirePOD” provides a self-contained, portable, standalone fire protection system that enables property owners, firefighters or others to mix and apply fire-protective gel or foam to entities such as structures, vehicles, vegetation, etc., to protect those entities from wildfire events or other external fire incidents. In various implementations, the FirePOD includes a recirculation-based mixing system for combining a mixture comprising a powder, liquid, or gel-based Thermal Protective Substance (TPS) with a volume of water or other liquid to produce the fire-protective gel or foam. By applying reconfigurable valves, one or more pumps are applied to both recirculate the mixture and, when sufficiently mixed, apply the resulting fire-protective gel or foam via one or more hoses or other dispensing mechanisms. In various implementations, the FirePOD is movable, and is manually or automatically propelled to locations suitable for applying the fire-protective gel or foam.

A admixing system for fire extinguishing systems for producing an extinguishing agent-extinguishing agent additive mixture (premix) by mixing an extinguishing agent additive with an extinguishing agent. The admixing system has a motor that can be driven by a flow of extinguishing agent, an admixing pump connected to the motor for pumping the extinguishing agent additive, an admixing line, and an extinguishing agent additive line, from which the extinguishing agent additive is mixed with the extinguishing agent in the admixing line. The admixing system has a branching line, from which a part of the flow of extinguishing agent can be branched off if the load in the fire extinguishing system only requires a small flow of extinguishing agent. In this manner, the flow of extinguishing agent flowing through the motor is artificially increased so that the motor runs in a higher rotational speed range in which a reliable operation of the motor is ensured (a so-called start-up flow reduction). The admixing system has a motor rotational speed measuring device and a controller, said controller being designed to completely or partly open and/or close the branching valve on the basis of the motor rotational speed measured by the motor rotational speed measuring device.

A fluid distribution system includes a water line configured to receive water from a water source, an agent line configured to receive agent from an agent source, a flush line configured to receive the water from the water source and connecting to the agent line at a junction, a flush valve positioned to selectively prevent the water from flowing along the flush line, an agent valve positioned to selectively prevent the agent from flowing along the agent line, a first flow meter positioned along the agent line downstream of the junction, a second flow meter positioned downstream of the first flow meter, an eductor coupled to the agent line and the water line downstream of the first flow meter and upstream of the second flow meter, a metering valve positioned downstream of the first flow meter and upstream of the eductor, and a controller.

A fire extinguisher includes a liquid fire extinguishing media, and first and second gases inside of a storage vessel at an operating pressure, and a discharge tube extending between a control valve and the fire extinguishing media. At least a portion of the first gas is dissolved in the fire extinguishing media. The control valve can be operated to control discharge of the fire extinguishing media via the discharge tube whereupon at least a portion of the second gas enters a flow of the fire extinguishing media via one or more holes in the discharge tube forming bubbles of the second gas in the flow of the fire extinguishing media. The fire extinguishing media exiting the control valve can pass through a nozzle which can causing first and second portions of the fire extinguishing media to collide forming a plume mist of the fire extinguishing media.

A proportioner having a body portion that defines a foam passage and a fluid passage. The proportioner also includes a restrictor assembly having a restrictor disk and an orifice plate having an opening for receiving the restrictor disk. The proportioner can further include a rod member connected to the restrictor disk and a clapper assembly connected to the rod member via a sliding interface. The clapper assembly can be configured to control a flow of the foam concentrate through the foam passage in proportion to a flow of the fire protection fluid through the fluid passage by moving the rod member to vary the distance between the restrictor disk and the orifice plate. The sliding interface can be disposed between a first guide and a second guide, and at least a portion of the restrictor disk is disposed in the opening.