An aqueous composition, which can be diluted with an aqueous diluent to provide a foam precursor composition, is provided. The foam precursor composition can be aerated to form a firefighting foam. The present aqueous firefighting compositions include a surfactant mixture containing a siloxane-based surfactant together with one or more of a nonionic surfactant, an anionic surfactant, and a zwitterionic surfactant. The aqueous firefighting compositions also include a polysaccharide thickener and an organic solvent, such as an alkylene glycol, glycerol and/or a glycol ether.

A mobile pump system for pumping water for extinguishing with an auxiliary agent, and a method therefor. The mobile pump system includes a frame for housing the pump system, a booster pump arranged in the frame, a metering pump arranged in the frame for the purpose of adding an auxiliary agent to a water flow, and a drive configured to drive the booster pump and the metering pump. The metering pump is provided with a displaceable metering pump frame and coupling means for connecting the metering pump to a container of the auxiliary agent.

A mobile pump system for pumping water for extinguishing with an auxiliary agent, and a method therefor. The mobile pump system includes a frame for housing the pump system, a booster pump arranged in the frame, a metering pump arranged in the frame for the purpose of adding an auxiliary agent to a water flow, and a drive configured to drive the booster pump and the metering pump. The metering pump is provided with a displaceable metering pump frame and coupling means for connecting the metering pump to a container of the auxiliary agent.

An adding system for fire-extinguishing units is disclosed for producing a mixture of extinguishing agent and extinguishing agent additive (premix) by adding an extinguishing agent additive, e.g., a foaming agent, to an extinguishing agent, e.g., water, the adding system comprising a motor, which can be driven by the extinguishing agent stream, an adding pump, which can be driven by the motor, an adding line, and an extinguishing agent additive line. The invention increases the operational reliability of an adding system for fire-extinguishing units by the outer wall of the working chamber of the motor being in the form of a rotation motor, which can also have the shape of a logarithmic spiral. Furthermore, the wall of the drainage housing of the motor, which is in the form of a rotation motor, can have a through-slot for letting the extinguishing agent in and/or out. Moreover, the inlet of the adding pump can be arranged such that the extinguishing agent additive can flow into the adding pump substantially parallel to the movement direction of the pistons of the adding pump. Finally, the adding pump can have an integrated relief valve.

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 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.

An apparatus and method directed to aspirated-type high-expansion foam generation having a nozzle manifold configured to receive a foam solution and at least one nozzle assembly. The generator includes a foam generator assembly disposed adjacent the nozzle manifold. The foam generator has a body portion having a first foam generating portion and a second foam generating portion that is connected to the first foam generating portion. The generator is configured with a main header of the nozzle manifold disposed orthogonal to at least one sub-header; less than six nozzle assemblies; a ratio of a diameter of an inlet of a respective nozzle to a distance from an inner wall surface of the header to the inlet of the respective nozzle is 0.8 or less; and a nozzle with a nozzle insert with a crossover path defined by a non-sharp transition member and a cone shaped tip.

The invention relates to a mobile pump system for pumping water and/or extinguishing agent and an associated method therefor. The mobile pump system comprises:

a frame for housing the pump system;

a booster pump arranged in the frame;

one or more submersible pumps arranged in the frame;

a booster pump motor drive configured to drive the booster pump;

a hydraulics motor drive configured to drive the one or more submersible pumps and wherein the hydraulics motor drive is configured to function as auxiliary drive for the booster pump; and

a coupling for coupling the booster pump to the hydraulics motor drive such that the hydraulics motor drive can function as auxiliary drive for the booster pump.

A fire-fighting foam stock tank includes a stock solution tank, a bladder set inside the stock solution tank, and a liquid collecting pipe installed inside the bladder. The stock solution tank has a first end tank wall provided with a first maintenance hole and a first hole cover. There is a hole plug on the inner surface of the first hole cover, so that the hole plug extends into the first maintenance hole until it is close to the inner wall surface of the stock solution tank, so that the inner wall surface is kept flat. The liquid collecting pipe is a T-shaped pipe composed of a first pipe section and a second pipe section. The bladder fits the liquid collecting pipe shape.

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.