Why is a low pressure gas system considered safer than a high pressure system?

The correct choice regarding why a low pressure gas system is considered safer than a high pressure system focuses on the operational safety features of low pressure systems. Low pressure systems inherently operate at lower pressures and temperatures, reducing the potential energy stored in the gas. In situations where flame failure occurs, a manual reset valve will indeed require human intervention to reset it before gas flow resumes. This design limits the risk of gas leakages and potential explosions because the system does not automatically restart under unsafe conditions. This adds an additional layer of safety, as it necessitates that an operator physically checks the system before allowing gas flow to continue, ensuring that the situation is stable and safe.

In contrast, automatic reset valves, while convenient, can lead to potentially unsafe situations if the system is not properly monitored. They can restart gas flow without confirming that safe operating conditions are present. Therefore, the manual reset requirement in low pressure systems acts as a critical safety feature, making them generally safer by preventing unintended system restarts in hazardous circumstances.