Plant Operation Practice Test

On the low pressure gas system, when can the manual reset be opened?

1. Before ignition

2. When the burner is warm

3. When the pilot is lit

4. When the system is cleared

The correct answer is: When the pilot is lit

The manual reset on a low-pressure gas system is designed to ensure safety and proper operational protocol. It can be opened when the pilot is lit because this indicates that combustion is occurring safely and that the burner has an active flame to ignite the gas. Having the pilot lit ensures that there is a reliable ignition source ready, preventing the risk of unburned gas accumulating in the system. Before ignition, there is a risk that gas could leak out without being ignited, leading to potentially hazardous situations. Therefore, this condition does not warrant opening the manual reset. Similarly, opening the manual reset when the burner is warm or when the system is cleared might not guarantee safe operation; each has its specific risks that could lead to gas not being ignited properly. Thus, it is essential to only open the manual reset with the pilot lit, ensuring that safety systems are adequately engaged and ready for operation.