Coolable wall element with impingement plate

A method for assembling an impingement plate onto a base body of a coolable wall, comprising the base body comprising a first surface subjectable to a hot gas, a second surface which is arranged opposite of the first surface and a first scat for housing opposing edges of the impingement plate and wherein the base body comprises at each edge of two opposing edges of the second surface a step each comprising a groove as the first scat of the impingement plate, the grooves comprise opposing first openings facing to each other, said grooves each comprising a second opening through which said opposing edges of the impingement plate are insertable into the corresponding grooves, wherein the base body comprises a second seat dedicated to receive a free end of a bendable retention tab of the impingement plate, said second seat is configured to block movement of said impingement plate relative to the base body when the bendable retention tab is released, and the impingement plate comprising the bendable retention tab extending from a rest of the impingement plate to the free end of said bendable retention tab, the method comprising:

• aligning each of the two opposing edges of impingement plate end-to-end with the respective groove and then translating the impingement plate in a direction parallel to the grooves so that the two opposing edges enter the grooves while temporarily lifting the bendable retention tab in a direction away from the second surface and into a biased position until the impingement plate approaches a final assembly position, and releasing or bending the bendable retention tab from the biased position, such that the free end of the bendable retention tab that has been released from the biased position sits in the second seat where the free end prohibits any further movement of the impingement plate relative to the base body.

A coolable wall element for a gas turbine, comprising:

• a base body comprising a first surface, a second surface opposite the first surface, a first side, a second side opposite the first side, a third side that connects the first side and the second side, and a fourth side opposite the third side, a retention feature, a first groove that extends along the first side and the first surface, and a second groove that extends along the second side and along the second surface and parallel to the first groove, wherein open faces of the grooves face each other;
• an impingement plate comprising a first edge, a second edge opposite the first edge, and a retention tab configured to flex from an unbiased position to a biased position;
• wherein installation of the impingement plate is effected by aligning the first edge end-to-end with the first groove, simultaneously aligning the second edge end-to-end with the second groove, flexing and holding the retention tab in the biased position, and then translating the impingement plate parallel to the grooves so that the first edge progressively enters the first groove and the second edge progressively enters the second groove until the impingement plate reaches a final assembly position, and
• wherein in the final assembly position the retention tab is released from the biased position to the unbiased position in which the retention tab engages the retention feature to prevent movement of the impingement plate relative to the base body.