Why is it required for steam turbines to be warmed up gradually?

asked 24 Jun '17, 04:07

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KnowledgeBase
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Starting from a cold condition without warming up is possible, but it does not contribute to continued successful operation of the unit. The thermal stress developed in the casings and rotors by a rapid heating have a harmful effect. The turbine must be warmed slowly by recommended warm-up procedure rates because of close clearances. They will be distorted due to local misalignments in the case of rapid heating.

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answered 24 Jun '17, 05:35

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