Bruce W Howard

US Patent:

46883274, Aug 25, 1987

Filed:

Aug 12, 1985

Appl. No.:

6/764705

Inventors:

Frank W. Cooper - Monroeville Boro PA
Bruce A. Howard - Inman SC
David A. Snyder - N. Huntingdon Township, Westmoreland County PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

B23P 1526
B23P 1900

US Classification:

29726

Abstract:

Apparatus for processing the damaged tubes of a steam generator. This apparatus includes a sleeving tool for inserting sleeves in the tubes, a high-roller tool for rolling the sleeves at their upper ends where they have been expanded, and a low-roller tool for rolling the sleeves at their lower ends in the tube sheet. Each tool is provided with locking pins which engage tubes adjacent to a tube to be processed and suspend the tool in processing position. The sleeves are inserted in the tubes and are rolled by rolls driven by a hydraulic motor. For sleeve insertion and for high and low rolling, the motor is controlled by a servo control valve. The feedback signal to this valve is derived from a flow transducer in the feed line for the motor. The feedback for the force of sleeve insertion is the pressure across the motor derived from pressure transducers in the conductors through which the motor is supplied. For insertion speed and for rolling speed, the feedback is derived from a fluid-flow transducer.