METHOD OF BREAKING ICE COVER FOR SURFACING OF SUBMARINE Russian patent published in 1997 - IPC

FIELD: building and operation of submarines. SUBSTANCE: method consists in feeding the jet of preheated liquid to surface of ice. Ice breaking procedure is effected at surfacing of submarine to periscope depth accompanied by correction of her position. Preheated water is fed by means of rods fitted with nozzles at minimum clearance between them and surface of ice, thus melting ice over entire perimeter of submarine and forming cuts. Then submarine is brought under these cuts and positive buoyancy is created, due to which submarine hull breaks ice slackened by cuts, after which submarine comes to surface. Water from circulating line is used for the purpose; at standard modes of operation, this water is discharged overboard and therefore there is no need in mounting bulky equipment on board submarine (heat exchange apparatus, pumps, etc.). EFFECT: avoidance of additional consumption of energy for heating and transfer of water. 7 dwg