California Designated Operator Practice Exam

What is NOT a requirement for the overfill prevention system in new tanks?

1. To activate an audible alarm before overfilling

2. To allow manual override of the prevention system

3. To restrict flow when the tank is near full

4. To provide positive shut-off of flow at capacity

The correct answer is: To allow manual override of the prevention system

The rationale behind selecting that option as the correct answer lies in the regulatory requirements for overfill prevention systems in new tanks. An effective overfill prevention system is designed to minimize the risk of spillage and ensure safety during tank filling operations. The system must include features such as an audible alarm that activates before overfilling occurs, ensuring that operators are informed of the tank's capacity status. Additionally, it is vital for the system to restrict flow when the tank is nearly full, which prevents potential overfills and associated hazards. Lastly, providing a positive shut-off of flow at capacity is essential to prevent any overflow from happening once the tank reaches its limit. Allowing a manual override of the prevention system, however, is not a requirement and can compromise safety. Such overrides could lead to situations where operators might inadvertently ignore the prevention measures put in place, increasing the risks of overfilling and environmental contamination. Hence, while the other elements are crucial components of a compliant and effective overfill prevention system, the ability to manually override is not mandated and represents a potential safety risk.