Tolerable Settlements of Steam Turbine-Generators

by J. Ronald Salley,
Ralph B. Peck,

Serial Information: Journal of the Power Division, 1969, Vol. 95, Issue 2, Pg. 227-252

Document Type: Journal Paper

Abstract: The foundations for one type of machine, the modern steam turbine-generator, are studied by relating observed differential settlements with operational records to determine tolerable distortions. Precise data were obtained from 16 units located in 11 different power plants. Additional data, precise enough to be of value, were obtained from 45 other units located in 8 different plants. Analyses of the data indicate that there exists in practice a real but unrecognized maximum allowable magnitude of warp for foundations of turbine generators having one long shaft (tandem units). Where this limit has been exceeded the shafts have generally been realigned. Generating units arranged into high- and low-pressure elements on two separate shafts (cross-compound units) appear to have different maintenance practices as such units have often been realigned in the absence of bearing movements. Revisions of specifications for turbine bases are suggested to limit the distortions of shafts, per unit of time, due to differential movements of bearings.

Subject Headings: Turbines | Shafts | Machine foundations | Distortion (structural) | Power plants | Differential settlement |

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