Gas turbine sealing band arrangement having an underlap seal

A sealing band arrangement for a gas turbine, wherein the gas turbine includes first and second adjoining rotor disks each including a disk arm having a slot and wherein the disk arms are separated by a disk arm gap, comprising:

• at least one first seal strip segment located within the slots, wherein the seal strip segment includes first and second ends;
• at least one second strip segment adjacent to the first seal strip segment, the at least one second strip segment includes first and second ends;
• and
• a tab section extending from a radially inner surface of the first seal strip segment to underneath a radially inner surface of the second seal strip segment so that an underlap seal with the second end of the adjacent second seal strip segment is formed;
• and
• a plurality of wide portions formed in the first seal strip segment, wherein the plurality of wide portions are wider than a remaining portion of the first seal strip segment for limiting movement of the first seal strip segment within the slots wherein the plurality of wide portions are disposed only at the first and second ends of the first seal strip segment and at a center portion of the first seal strip segment,
• wherein a thickness of the first and second ends of the at least one first seal strip segment is substantially equivalent to a thickness of the first seal strip segment, and
• wherein a thickness of the first and second ends of the at least one second seal strip segment is substantially equivalent to a thickness of the second seal strip segment.