Plant Operation Practice Test

What role does the pressure drop after a safety valve opens play in a boiler system?

1. It increases combustion efficiency

2. It indicates normal operation

3. It stops fuel flow

4. It triggers alarms

The correct answer is: It indicates normal operation

The pressure drop after a safety valve opens is indicative of a normal operation in a boiler system. When the safety valve activates due to excessive pressure, it functions as a protective mechanism to release steam or pressure within the system. This releasing action is designed to prevent potential accidents or failures that can occur from overpressure conditions. A pressure drop following the opening of the safety valve signifies that the safety device is functioning correctly, allowing for a stabilization of pressure and ensuring the safety of the boiler system. This is crucial, as maintaining proper pressure levels is essential for the safe operation of the boiler. In contrast, while options related to combustion efficiency, stopping fuel flow, and triggering alarms are relevant to boiler operations, they do not pertain directly to the specific role of the pressure drop after a safety valve activates. Instead, the experience of a pressure drop primarily reflects normal response behavior in a well-functioning safety system.