Endface gap sealing of steam turbine bucket tip static seal segments and retrofitting thereof

摘要

Spline seals are disposed in circumferentially registering slots of adjacent arcuate seal strip segments disposed in grooves of diaphragm assemblies of a steam turbine in radial opposition to the rotating tips of the buckets. The spline seals extend in the gaps between the endfaces of the segments and minimize or preclude steam leakage past the endfaces. The spline seals are disposed in slots which may be formed as part of original equipment manufacture or may be machined in segments with the spline seals provided as retrofits.