Electric Power Research Institute Incorporated

Greg Frederick

David Wayne Gandy

Kent Coleman

Rich Tilley

A method for the inspection and repair of a tube includes electrical discharge machining an access hole into the tube, optionally at or near the uppermost location on the tube, near the upper header; performing inspection of the tube, optionally using a visual or an eddy current inspection technique; providing an inner diameter flush-mounted plug insert which has been machined for re-inserting into the access hole; and attaching the plug insert to the tube.

Method for inspection and repair

A method for repairing a heat recovery steam generator (HSRG) header to tube attachment damage, includes providing an access window in the header opposite the damaged header to tube attachment location; removing the header to tube attachment damage; inserting a tapered stub tube into a header penetration centered axially immediately over the tube; effecting a profile weld between the header and the tapered stub tube at the header penetration from the inside surface of the header; welding the tapered stub tube to the existing tube through the header inside diameter; welding shut the access window; and completing a post weld heat treatment of all the welds.

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Harrisburg, NC, United States of America

Greg Frederick