METHOD OF REBUILDING PUMP AND COMPRESSOR TUBES WITH WORN THREADED CONNECTIONS Russian patent published in 1994 - IPC

FIELD: deep-hole drilling. SUBSTANCE: method involves unscrewing coupling and screwing worn part of coupling on worn threaded part end of tube; providing permanent connection between coupling and tube body; conducting heating of end and coupling seated onto tube to hardening temperature, at which stresses are relaxed into connection to facilitate easy unscrewing of coupling. Prior to screwing worn part of coupling on worn threaded end of tube, their threads are coated with epoxy adhesive. EFFECT: increased processability of rebuilding and enhanced reliability in operation of worn threaded connections.