Class A/B Operator for Underground Storage Tank (UST) Practice Test 2025 - Free UST Operator Practice Questions and Study Guide

The statement regarding the function of an overfill alarm is indeed that it is designed to alert the operator to a potential overfill condition during fuel delivery. However, overfill alarms do not automatically shut off the flow of product; that function is typically managed by an active overfill prevention system, which may include automatic shut-off devices.

The role of an overfill alarm is to notify operators to take action before the tank reaches its maximum capacity, thereby allowing for manual intervention to prevent an overfill situation. This unsafe condition can lead to spills, which pose environmental hazards and regulatory violations. Therefore, while overfill alarms serve a critical safety function by providing a warning, they do not directly halt the fuel delivery process; this is what distinguishes the alarm's function from that of automatic shut-off mechanisms. Understanding this distinction is crucial for proper UST management and compliance with safety regulations.