Firefighting double-nozzle deluge gun and control method thereof

A method for controlling a firefighting double-nozzle deluge gun, comprising the steps of:

• arranging a pair of nozzles side by side pivotally on a rotatable member, said nozzles forming an angle therebetween;
• controlling said angle between said nozzles;
• measuring said angle between two lines obtained by projecting center lines of said nozzles onto a horizontal plane;
• positioning a deflector in front of each nozzle during a short range watering operation;
• providing said deflector with a side cover for preventing a water stream having passed through said deflector from spreading excessively sideways;
• adjusting said angle between said nozzles and water-shooting pressure in accordance with desired water-reaching ranges for achieving an optimal watering pattern in any range between a substantially long range and a short range, an optimal watering pattern being achieved for a relatively very short range by controlling said deflector, said water-shooting pressure and said angle between said nozzles;
• and controlling said angle, the water-shooting pressure and whether or not to use deflectors on basis of four modes comprising a long range mode, an intermediate range mode, a short range mode, and a very short range mode for achieving an optimal watering pattern during each of said modes, said watering pattern being maintained constant from long range to substantially short range.

A method for controlling a firefighting double-nozzle deluge gun, comprising the steps of:

• arranging a pair of nozzles side by side pivotally on a rotatable member, said nozzles forming an angle therebetween;
• controlling said angle between said nozzles;
• measuring said angle between two lines obtained by projecting center lines of said nozzles onto a horizontal plane;
• positioning a deflector in front of each nozzle during a short range watering operation;
• providing said deflector with a side cover for preventing a water stream having passed through said deflector from spreading excessively sideways;
• adjusting said angle between said nozzles and water-shooting pressure in accordance with desired water-reaching ranges for achieving an optimal watering pattern in any range between a substantially long range and a short range, an optimal watering pattern being achieved for a relatively very short range by controlling said deflector, said water-shooting pressure and said angle between said nozzles;
• and controlling said angle, the water-shooting pressure and whether or not to use deflectors on basis of four modes comprising a long range mode, an intermediate range mode, a short range mode, and a very short range mode for achieving an optimal watering pattern during each of said modes;
• said range being substantially 40 to 60 meters during said long range mode, said angle between said nozzles being substantially 0.degree. and said water-shooting pressure being substantially 7 kg/cm.sup.2 and said deflectors being absent;
• said range being substantially 30 to 50 meters during said intermediate range mode, said angle between said nozzles being 5.degree. and said water-shooting pressure being substantially 5 kg/cm.sup.2 and said deflectors being absent;
• said range being substantially 18 to 35 meters during said short range mode, said angle between said nozzles being substantially 8.degree. and said water-shooting pressure being substantially 3 kg/cm.sup.2 ;
• and arranging said deflectors so that water strikes only portions of said deflectors;
• said range being substantially 0 to 20 meters during said very short range mode, said angle between said nozzles being substantially 8.degree. and said water-shooting pressure being substantially 5 kg/cm.sup.2 and said deflectors being present, said watering pattern being maintained constant from long range to substantially short range.