What is the maximum setting range for safety valves related to MAWP?

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

The correct choice highlights that the complete range of safety valves should not exceed 10% of the highest set valve. This guideline ensures that there is sufficient safety margin catered for pressure fluctuations while maintaining system integrity.

In practice, by allowing a maximum range of 10% above the highest set valve, it provides necessary redundancy to prevent accidental over-pressurization of the boiler or vessel. This range accounts for conditions that could cause a spike in pressure, ensuring that the safety system remains reliably effective.

The other options suggest different safety parameters that do not align with standard practices. For example, safety valves must be set based on the maximum allowable working pressure (MAWP) and ensure they will activate accordingly. While the notion that valves must relieve steam at pressures that do not exceed MAWP and safety factors relative to MAWP are fundamental, they do not encapsulate the specific regulatory framework that the question seeks. Thus, maintaining the stated 10% above the highest set valve is critical for optimal performance and safety in system operations.

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