Repair method for a gas turbine
AssigneeHitachi, Ltd.
InventorsMasaru Sekihara, Shigeo Sakurai
Life of this patent
Estimating the term…
Abstract
A gas turbine has a compressor for compressing air as a working fluid, a combustor for producing combustion gas by mixing fuel with the compressed air, and a turbine for generating a rotating force at the time of expansion of combustion gas. The gas turbine further includes a cylindrical liner; a transition piece for transferring the working fluid from the liner to the turbine; an outlet portion of the transition piece, which has a region parallel with a direction of a rotating shaft of the turbine; cooling holes formed in the region so that longitudinal intervals thereof are lengthened; and a picture frame portion provided to secure stiffness at an outlet of the outlet portion.
Claims4
A repair method for a gas turbine having a compressor for compressing air as a working fluid, a combustor for producing combustion gas by mixing fuel with the compressed air, and a turbine for generating rotational power at the time of expansion of the combustion gas, said method comprising:
- providing, on an outlet portion of a transition piece for transferring said working fluid to said turbine, a region parallel with the direction of rotating shaft of said turbine, cooling holes in said region so that the longitudinal intervals thereof are lengthened, and a picture frame portion to secure stiffness of an outlet of said outlet portion, and
- cutting said outlet portion at a portion where the longitudinal intervals of said cooling holes are lengthened to separate said picture frame portion from said transition piece, and
- welding another picture frame portion prepared in advance to the cut portion for replacement.
Dependencies are inferred from the claim text.