Method for repairing heat recovery steam generator...

Electric heating – Metal heating – Of cylinders

Reexamination Certificate

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Details

C029S402070, C029S890031, C219S069170, C219S069200

Reexamination Certificate

active

07547859

ABSTRACT:
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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