Abstract: A compressor bleed air manifold includes annular outer flanges on opposite sides of the generally annular manifold plenum. The outer and inner flange geometries may be circumferentially tailored to produce optimal case stiffness and thermal response for blade-to-case clearances. The inner flanges are secured to one another by an inner bolt circle radially adjacent the flow path thereby improving the case stiffness, out of roundness and eliminating unsupported sections of the flowpath along an outer diameter thereof. The flanges of the outer bolt circle seal the plenum. The compressor bleed air manifold and the compressor casing load path are thereby isolated from one another.

Abstract: A double wall bearing cone closes an opening between a bearing housing and an exhaust frame in a gas turbine. The bearing cone includes a conical forward plate having an inner diameter and an outer diameter and a conical aft plate nested with and spaced from the conical forward plate. A hub connects the inner diameters of the forward plate and the aft plate. The hub preferably includes holes therein that serve to meter air flow between the forward plate and the aft plate. The double wall bearing cone defines a cooling circuit that reduces wear between a third stage turbine wheel in a gas turbine and the rotor aft shaft.