Fixed systems and methods for extinguishing industrial tank fires, with and without fixed roof, including aerated foam projecting nozzles and center directed nozzles

A method for extinguishing fire in an industrial tank, comprising:

• using a fire fighting apparatus, the fire fighting apparatus comprising:
• a first ambient air aeration chamber located in a first fluid conduit upstream of, and in fluid communication with, a forcefully projecting nozzle, the first ambient air aeration chamber is structured to produce a first aerated foam;
• and
• a tapered portion located in the first fluid conduit downstream of, and in fluid communication with, the first ambient air aeration chamber, a first end of the tapered portion being larger than a second end of the tapered portion, the second end of the tapered portion being connected to a tip portion of the forcefully projecting nozzle;
• and
• at least two discharge nozzles located in a second fluid conduit at its distal end, the at least two discharge nozzles structured to discharge a second aerated foam, in roughly opposing directions, along interior side wall portions of the industrial tank, wherein the second fluid conduit is adjacent to, and proximate to, the first fluid conduit;
• forcefully projecting the first aerated foam through the forcefully projecting nozzle radially toward the center of the industrial tank in a substantially focused stream;
• and
• projecting the second aerated foam through the at least two discharge nozzles, in roughly opposing directions, along interior side wall portions of the industrial tank.

A method for extinguishing fire in an industrial tank, comprising:

• using a fire fighting apparatus, the fire fighting apparatus comprising:
• a first ambient air aeration chamber located in a first fluid conduit upstream of, and in fluid communication with, a forcefully projecting nozzle, the first ambient air aeration chamber is structured to produce a first aerated foam;
• a tapered portion located in the first fluid conduit downstream of, and in fluid communication with, the first ambient air aeration chamber, a first end of the tapered portion is larger than a second end of the tapered portion, the second end of the tapered portion is connected to a tip portion of the forcefully projecting nozzle;
• at least one stream shaper located in the first fluid conduit downstream of, and in fluid communication with, the tapered portion, and upstream of, and in fluid communication with, the tip portion of the forcefully projecting nozzle;
• and
• at least two discharge nozzles located in a second fluid conduit at its distal end, the at least two discharge nozzles are structured to discharge a second aerated foam, in a roughly horizontal direction, and in a roughly opposing directions around an interior top tank wall surface of the industrial tank;
• forcefully projecting the first aerated foam through the forcefully projecting nozzle radially toward the center of the industrial tank in a substantially focused stream;
• and
• projecting the second aerated foam through the at least two discharge nozzles in the roughly horizontal direction and in the roughly opposing directions, around the interior top tank wall surface of the industrial tank.