Arkansas Boiler Operator Practice Exam

Which component is vital for preventing excessive internal pressure in a boiler?

1. Feedwater pump

2. Safety valve

3. Blowdown pipe

4. Pressure gauge

The correct answer is: Safety valve

The safety valve is a critical component in a boiler system specifically designed to prevent excessive internal pressure. As the boiler heats water, steam is generated, which increases the internal pressure. If this pressure exceeds safe levels, it can lead to dangerous situations, including potential boiler explosions. The safety valve automatically opens to release steam when it detects that pressure has reached a predetermined limit, effectively preventing the pressure from rising further. This safety mechanism ensures that the boiler operates within safe limits, providing protection for both the equipment and personnel. In contrast, while the feedwater pump supplies water to the boiler, it does not control pressure. The blowdown pipe serves to remove sludge and impurities, maintaining water quality rather than regulating pressure. The pressure gauge accurately indicates the internal pressure but does not have any regulatory function; it simply provides information for the operator. Thus, the safety valve uniquely fulfills the essential role of pressure regulation within the boiler system.