DEVICE FOR PIPE EXPLOSIVE CUTTING Russian patent published in 2003 - IPC

FIELD: explosive devices applicable in servicing oil and gas fields, particularly, for cutting of piles of oil production offshore platforms in their dismantling upon completion of operation, and also for remote explosive cutting of pipes in other industries. SUBSTANCE: device has carrying member with longitudinal axle, explosive mechanism, appliance for changing over explosive mechanism from folded to unfolded working positions, appliance for initiation of explosive mechanism. The latter is made in the form of a group of explosive generators of rarefaction shock waves. Explosive generators are secured over periphery of carrying member at different levels, along its longitudinal axis for possible motion to working position to one level on anticipated line of cutting. Each generator consists of explosive charge in the form of circular segment with convex-cylindrical working surface placed in matrix facilitating formation of rarefaction waves and has appliance of counter directed multipoint simultaneous initiation along change entire length. Present guides of carrying member make it possible to change over explosive mechanism from folded to working unfolded positions with the help of drives of radial and longitudinal motion of each explosive generator. Appliance for changing over of explosive mechanism to working position has at least one common for all generators drive of motion in the form of working cylinder with movable piston kinematically connected with explosive generators. Technical result of use of said device consists in freeing of sea shelf from used oil and gas production offshore platforms without disturbance of sea biosphere. EFFECT: higher efficiency of use. 2 cl, 3 dwg