Which procedure is recommended to protect a superheater during cold startup?

Study for the Massachusetts 3rd Class Engineer Exam. Access flashcards and multiple choice questions with hints and explanations. Prepare for success on your exam!

Gradual heating is crucial during cold startup to protect a superheater. This procedure allows for even distribution of heat across the superheater's surfaces, preventing thermal stress that can arise from sudden temperature changes. Rapid heating can lead to thermal shock, which may cause cracking or other damage to the materials of the superheater due to the differences in expansion rates in various parts of the unit.

During the gradual heating process, the temperature is slowly increased, allowing components to expand uniformly and reducing the likelihood of stress concentrations. This approach not only extends the service life of the superheater but also promotes safe operation. Other practices, such as immediate pressurization or shutting off water circulation, could create hazardous conditions and should be avoided during the startup phase.

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