What is the minimum capacity for which vent alarms are required on outside tanks?

The minimum capacity for which vent alarms are required on outside tanks is 65 gallons. This regulation is in place to ensure safety and environmental protection. Vent alarms are essential in preventing overfilling by alerting operators when the tank has reached a certain level, thereby minimizing the risks of spills and leaks.

Tanks that hold a capacity of 65 gallons or more are large enough that any overfilling could potentially result in significant environmental hazards or safety risks. Therefore, requiring vent alarms on these tanks ensures that operators are notified before reaching a critical level, allowing them to take appropriate action to prevent overflows.

Tanks smaller than 65 gallons typically do not pose the same level of risk in terms of environmental impact and safety concerns, which is why vent alarms are not mandated for those capacities.