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Power Plant Instrumentation and Control Handbook by Ajay Kumar Debnath, Swapan Basu

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3. Reheat Steam (P&IDs): Cold and Hot Reheat

3.0. Reheat Steam System

Reheat steam has two parts: CRH and HRH.

3.1. CRH Steam System

3.1.1. Objective and Function of The System

The exhaust from the HPT is the starting point of CRH steam. HPT exhaust represents for that piping section, where steam outlet from both the HPT and HP bypass system come and join. CRH steam may also be generated even when the HPT is not in operation, and sometimes as a combination of both. Depending on the load, CRH steam pressure at the HPT outlet may vary, so when the HP bypass works in tandem, the variations need to be controlled. This system includes the following major functions:
• The steam is sent to the boiler for reheating so that it can be sent back to the turbine ...

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