Abstract: A coolable wall element for a gas turbine, having a base body with a first surface subjectable to a hot gas, second surface arranged opposite of the first surface, and first seat for housing edges of an impingement plate. The wall element has an impingement plate partly inserted into the first seat located at a distance and adjacent to the second surface. A coolable wall element with extended life time is provided with the impingement plate which is removably attached to the base body having a snap-in connection with a bendable retention tab extending from the rest of the impingement plate to a free end of the retention tab, wherein the base body has a second seat for the free end of said tab, the second seat blocks the moving of the impingement plate relative to the main body when the bendable retention tab is released.

Abstract: A ring segment for a gas turbine has a base body having a first surface subjectable to hot gas, second surface arranged opposite of the first surface and fastening elements extending from the second surface. The ring segment extends in the axial direction and in an azimuthal direction of the gas turbine. The first and second surfaces are curved in the azimuthal direction and straight along the axial direction. The fastening elements have at least two rows of hooks, each extends in the azimuthal direction, wherein each hook has an outwardly directed surface and an inwardly directed surface which are curved in the second direction. At the outer sections of the ring segment the distances (R3) are smaller than that (R4) in the middle section. The distances (R5, R6) between the outwardly directed surfaces of the corresponding row of hooks and the machine axis is constant along the azimuthal direction.

Abstract: A coolable wall element for a gas turbine, having a base body with a first surface subjectable to a hot gas, second surface arranged opposite of the first surface, and first seat for housing edges of an impingement plate. The wall element has an impingement plate partly inserted into the first seat located at a distance and adjacent to the second surface. A coolable wall element with extended life time is provided with the impingement plate which is removably attached to the base body having a snap-in connection with a bendable retention tab extending from the rest of the impingement plate to a free end of the retention tab, wherein the base body has a second seat for the free end of said tab, the second seat blocks the moving of the impingement plate relative to the main body when the bendable retention tab is released.