What is the requirement for vent alarms on outside oil tanks?

The requirement for vent alarms on outside oil tanks is based on safety and environmental protection standards specifically related to the types and sizes of tanks used for storing fuel oil. Option C states that vent alarms are required for all No. 1 and No. 2 fuel oil tanks that have a capacity ranging from 65 to 5,000 gallons. This specification is crucial as it ensures that tanks holding significant quantities of fuel oil are monitored for overfilling, which can lead to spills and environmental hazards.

The inclusion of vent alarms in this requirement serves to alert operators to potential overfilling situations, thereby preventing spillage and maintaining safety standards around combustible materials. These alarms are particularly important for larger tanks, as they are more likely to result in larger volumes of fuel being released in the case of a failure or oversight.

In contrast, the other choices do not address the comprehensive safety standards associated with fuel oil tanks. For instance, stating that vent alarms are only required for tanks over 10 gallons ignores the specific types of fuels and the defined range of capacities that are outlined in the regulations. Additionally, limiting the requirement to tanks located near buildings or making it seasonal does not align with the established safety protocols that prioritize consistent monitoring to mitigate potential hazards all year round