July 2012

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HP Engineering Case Histories: Case 69: Heat-up rate and rubs on a steam turbine

This column has suggested using simple analytical models to troubleshoot equipment. However, in some cases, a more detailed solution may be required. The following case histories examine the heat up o..

Sofronas, T., Consulting Engineer

This column has suggested using simple analytical models to troubleshoot equipment. However, in some cases, a more detailed solution may be required. The following case histories examine the heat up of a steam turbine and the thermal growth of the rotor assembly and stationary case. The finite element analysis (FEA) is used here to identify root causes for failure events. Turbine example The outline of a simplified model for a four-stage steam turbine is shown in Fig. 1. It is an axis-symmetric model, which means that if you rotate the area about the Y axis, it will be a solid three- dimensional model. This greatly simplifies the FE modeling, and this information is all that is needed fo

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