Abstract: A pressure relief diaphragm is associated with a turbine housing and is operable to relieve excessive pressure within the turbine housing to prevent damage to turbine blades. The pressure relief diaphragm includes a safety housing having a mounting flange thereon arranged to mate with a turbine flange so that the safety housing is positioned over a relief opening in the turbine housing. A first solid, frangible solid disc covers the relief opening in the turbine housing and has a peripheral portion interposed between the mounting flange on the safety housing and the turbine flange. A second solid disc is positioned in the relief opening in the turbine flange in abutting contact with the first solid disc. A first plurality of bolts secures the mounting flange on the safety housing to the turbine flange. Spring washers associated with the first plurality of bolts maintain the positional relationship between the safety housing and the turbine flange.

Abstract: The present invention substantially reduces the likelihood of cracking failure occurring in the inlet sleeves which connect a steam source to the outer cylinder of a steam turbine. The present invention eliminates the excessive vibration which is the fundamental cause of cyclic stresses which cause fatigue cracking. The present invention minimizes vibration by limiting the amplitude of the sleeve's oscillations of the inlet sleeve by preferably restraining the sleeve within a structure such as a disc having grooves cut therein which engage splines formed on the inlet sleeve. The present invention provides sufficient clearance for installation but reduces the amplitude of radial oscillations. The present invention thus allows free vertical and radial sleeve movement of the inlet sleeve, but limits random vibration that caused highcycle vibrations.

Abstract: A steam turbine having a inner cylinder with a plurality of steam inlets which feed a plurality of nozzle blocks and a curtis stage blade ring with a circumferential groove which cooperates with a circumferential tongue extending from the inner cylinder to position the blade ring properly within the cylinder, the tongue has a plurality of ports each of which have a kerf extending from each port through an inner circumferential margin of the tongue to eliminate heat induced stress cracking between the ports and inner circumferential margin of the tongue.

Abstract: A damping device for limiting motion of nozzle chamber members relative to each other and relative to a casing of a turbine apparatus both in the axial direction and in a transverse plane. The device comprises a friction generating member mounted on a nozzle chamber and disposed in abutting contact with an adjacent nozzle chamber or with the turbine casing. Relative motion between the contacted surfaces of the friction generating member and the surface against which it abuts generates a friction force which limits motion therebetween. The friction generating member is biased by a suitable arrangement disposed in a bore in one of the chambers to maintain contact with the abutting surface. A bias force acting on the friction generating member in a substantially axial direction relative to the bore assists in further maintaining the axial alignment of the members.