3rd Class Power Engineer (3B2) Practice Exam 2025 – Comprehensive Study Guide

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What happens if the pressure in a boiler exceeds the safety valve's set pressure?

The boiler will automatically shut down completely

The safety valve will open to relieve excess pressure

When the pressure in a boiler exceeds the safety valve's set pressure, the safety valve is designed to open automatically in order to relieve the excess pressure. This mechanism is a critical safety measure in boiler operation. The purpose of the safety valve is to prevent catastrophic failure, such as an explosion, by allowing steam or liquid to escape, thus reducing the pressure within the boiler to a safe level.

The design of safety valves ensures they function reliably under these conditions, promptly activating when the pressure threshold is met or exceeded. This ability to relieve pressure is essential for maintaining the integrity and safety of the system. Therefore, the operation of the safety valve is a fundamental aspect of boiler safety, helping to protect not just the equipment but also the personnel and environment surrounding the boiler.

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The system will explode

The pressure will be redirected to a different section of the system

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