What is the purpose of a fuel oil storage tank's emergency vent?

The primary purpose of a fuel oil storage tank's emergency vent is to relieve excessive pressure that may build up within the tank, particularly in cases of thermal expansion. When the fuel inside the tank is heated, it can expand, leading to an increase in pressure. If this pressure is not adequately managed, it could result in structural failure or leakage of the tank. The emergency vent is designed to allow excess vapor to escape, thus preventing overpressure conditions that could compromise the integrity of the storage system. This safety feature is critical in ensuring the safe handling and storage of fuel oil, aligning with regulations and best practices in fuel oil management.