What occurs if an oil vent is closed?

When an oil vent is closed, the primary issue that occurs is pressure build-up within the system. Oil tanks and fuel systems are designed to allow vapors to escape to prevent pressure accumulation. If the vent is blocked or closed, it prevents the needed airflow and pressure equalization, which can lead to serious operational problems.

Pressure build-up can cause various issues including leaks, structural damage to the tank, or even catastrophic failures. The accumulation of pressure can force oil out of seals or gaskets, potentially leading to an oil spill. Additionally, excessive pressure can affect fuel delivery systems, and if not resolved, could even lead to fires or explosions. Thus, the situation that arises from a closed oil vent is best identified as pressure build-up, which can cascade into other problems, including spills.

In summary, closing an oil vent primarily leads to pressure build-up, which can result in an oil spill, but the direct and immediate consequence is the increase in system pressure.