Mobile firefighting systems with breathable hypoxic fire extinguishing compositions for human occupied environments

A mobile firefighting system for providing a breathable fire-extinguishing composition at a fire site, said system comprising:

• a high-pressure gas vessel containing said composition under a pressure of over 100 bar, said vessel having a refilling inlet with a one-way valve and an outlet;
• said outlet communicating with a pressure-reducing device and transmitting said composition into a reduced-pressure container;
• said reduced-pressure container communicating with a distribution unit having multiple gas outlets that communicate with gas delivery hoses and transmit said composition to the location of fire;
• a motorized chassis for carrying said vessel and equipment of said system and delivering it to fire site;
• a refilling station installed separately at a fire station or on a mobile platform;
• said refilling station generating said composition from an ambient air and storing said composition in a high-pressure storage container;
• said composition being breathable oxygen-depleted air having oxygen content below 16%.

A mobile firefighting unit for providing a breathable hypoxic fire-extinguishing agent at a fire site, said unit comprising:

• a transportable liquid nitrogen container having a refilling inlet and liquid nitrogen outlet;
• said container filled with liquid nitrogen when said mobile unit at service;
• said liquid nitrogen outlet communicating with a vaporizer and, when in use, transmitting liquid nitrogen into it for vaporization;
• a mixing chamber communicating with said vaporizer and receiving nitrogen gas from it for mixing with ambient air supplied by an air pump communicating with said chamber;
• said breathable agent being prepared in said mixing chamber by adding ambient air to said nitrogen gas;
• said agent having oxygen content below 16%;
• a distribution device communicating with said mixing chamber and receiving said agent from it for distribution through multiple gas outlets;
• multiple gas delivery hoses connected to said gas outlets and delivering said agent to location of fire;
• said distribution unit having transducers for measuring pressure and oxygen content in said agent and allowing to regulate these parameters manually or automatically;
• a truck or trailer platform for transporting equipment of said mobile unit to a fire site;
• a refilling station installed separately on the ground or a mobile platform and having a liquid nitrogen production plant and a storage container designed for quick refilling of said mobile unit with liquid nitrogen.

A mobile firefighting system for providing a breathable fire-extinguishing agent at a fire site, said system comprising:

• a high-pressure gas container containing a nitrogen gas under a pressure of over 100 bar, said container having a refilling inlet with a one-way valve and an outlet;
• said outlet communicating with a pressure-reducing device and transmitting said nitrogen gas into a mixing chamber;
• said mixing chamber communicating with an air supply device and receiving an ambient air from said device for mixing with said nitrogen in order to produce said fire-extinguishing agent;
• said mixing chamber communicating with a distribution unit having multiple gas outlets that communicate with gas delivery hoses and transmit said agent to the location of fire;
• a motorized chassis for carrying said container and equipment of said system and delivering it to fire site;
• a refilling station installed separately at a fire station or on a mobile platform;
• said refilling station generating said nitrogen gas from the ambient air and storing said gas in a high-pressure storage vessel;
• said breathable agent being a mixture of nitrogen and ambient air having an oxygen content below 16%.

A method of producing a breathable fire-extinguishing composition, said method comprising:

• generating of a necessary quantity of liquid nitrogen being stored in a dewar-type container;
• transmitting said liquid nitrogen into a vaporizer;
• vaporization of said liquid nitrogen being transformed into a nitrogen gas;
• transmitting of the nitrogen gas into a mixing chamber wherein said gas being mixed with a corresponding amount of an ambient air delivered by an air pumping device and producing a breathable gas mixture having fire suppressive properties;
• said gas mixture being delivered from said mixing chamber into a distribution and control unit equipped with oxygen and pressure monitoring devices that allow to control an oxygen content and a pressure in said gas mixture;
• said gas mixture being supplied from said distribution unit into multiple gas delivery hoses for delivery of said breathable gas mixture to the location of fire in order to suppress combustion and providing fresh human-breathable atmosphere;
• said breathable gas mixture having an oxygen content below 16%.