What Are Topping And Superposed Turbines?

What Are Topping And Superposed Turbines?
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Topping and superposed turbines arc highpressure, noncondensing units that can be added to an older, moderatepressure plant. Topping turbines receive highpressure steam from new highpressure boilers. The exhaust steam of the new turbine has the same pressure as the old boilers and is used to supply the old turbines.
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