METHOD FOR SUPPLY OF LIQUID NITROGEN TO FIRE-HOSE BARREL AND DEVICE FOR ITS REALIZATION Russian patent published in 1994 - IPC

FIELD: fire-fighting equipment. SUBSTANCE: part of liquid nitrogen is taken from reservoir and heated in evaporator (gasified), returned vapors are passed through layer of fluid and simultaneously supplied to reservoir gas hollow. Pressure in gas hollow exceeds the pressure of saturation, fluid proves to be nonheated fully - it does not boils, and, having large density at evaporator inlet, fills it better. In this case, hydrostatic head for bubbling also rises to assist fluid heating in the entire volume owing to condensation heat of separate bubbles up to saturation state, without fear of pressure drop during fluid shaking in transportation. Device for supply of liquid nitrogen to fire- hose barrel includes isothermal reservoir with liquid nitrogen mounted on vehicle, evaporator connected with the help of pipelines supplying fluid and returning vapors to reservoir and dispensing pipeline. Pipeline for returning vapors has two end branch pipes, one of which is lowered to reservoir bottom part and provided with perforated collector (bubbler) and the other is communicated with reservoir top and has cutoff valve. EFFECT: higher efficiency. 2 dwg