Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing
Reexamination Certificate
2011-01-04
2011-01-04
Edgar, Richard (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
Rotor having flow confining or deflecting web, shroud or...
Axially extending shroud ring or casing
Reexamination Certificate
active
07862300
ABSTRACT:
A turbomachinery blade having a relief hole in its platform and a method of limiting the formation and/or propagation of cracks in the trailing edge of the blade are provided. The relief hole may be formed in the concave side of the platform proximate the trailing edge along its mean camber line. The relief hole may be circular in cross-section and is blind, i.e., does not exit on any other face of the platform. The relief hole prevents the formation of cracks in the trailing edge of the blade and also slows the propagation of any cracks which may have formed in this region of the blade.
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Arnal Michel P.
Nadvit Gregory M.
Tessarini Leone J.
Williams Andrew D.
Baker & Botts L.L.P.
Edgar Richard
Wood Group Heavy Industrial Turbines AG
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