Patent ID: 7112261

Claim:
A safety system for use in a coking facility where there is a coke drum having an upper end opening defined by a surrounding opening structure of the coke drum, and a drill assembly comprising a drill stem, a drill head at a lower end portion of the drill stem, and a liquid discharge system to provide high pressure liquid for a liquid discharge section of the liquid discharge system at said drill head, said drill assembly being arranged to raise and lower said drill head between a lower operating location where the liquid discharge section is positioned to emit a liquid jet discharge in said coke drum for removal of coke material in the drum, and having an upper retracted position at a retracted location where said drill head is located above said drum, said system comprising: a) an enclosing structure which is located above the upper end opening of the coke drum so as to enclose the retracted location in a manner that if the drill head is in the retracted location and emits a jet discharge therefrom, said enclosing structure causes the jet discharge to be redirected in the enclosing structure; b) an access system which comprises an opening structure in said enclosing structure to provide access to said drill head in its retracted position, and a door which is movable between a closed position and an open position, with the door in its closed position blocking the jet discharge from passing out through the access opening, and with the door in its open position permitting access to the drill head inside said enclosing structure.