In a fuel storage system with three or more tanks, what must each appliance line have?

In a fuel storage system that includes three or more tanks, each appliance line must have its own shutoff valve. This requirement is crucial for safety and operational efficiency. Having individual shutoff valves allows for isolation of specific tanks or lines for maintenance or in case of a malfunction. It ensures that if there is an issue with one line, it can be addressed without affecting the others, thereby minimizing risks such as leaks or spills.

The presence of individual shutoff valves also promotes compliance with industry regulations and standards, which often mandate such safety measures to protect both the equipment and the environment. In the event of an emergency, being able to quickly shut off fuel flow from a specific source is essential for containment and response.

Furthermore, while shared gauges and pressure relief valves are important components in a fuel storage system, they do not directly address the need for isolating appliance lines with independent controls. The common shutoff valve option does not meet the requirements as effectively, as it would not provide the necessary level of control for each independent line.