What should the orientation of vent outlets ensure?

The correct focus of vent outlets is to prevent vapor accumulation within the storage tank system. Proper venting is crucial in managing the pressures within the tank, especially during filling and withdrawal of the contents. When vapors are allowed to accumulate in the tank, it can lead to dangerous pressure build-up or the release of harmful fumes in the vicinity, both of which pose safety and environmental risks.

Additionally, proper venting helps to ensure that the vapors have a safe escape route, minimizing the risk of potential leaks or explosions. This is particularly important for underground storage tanks, which can trap vapors and lead to hazardous conditions if not adequately vented.

While considerations like protection from weather, accessibility for maintenance, and compliance with local codes are important for the overall management and operation of underground storage tanks, the primary purpose of vent outlets is to maintain safety by preventing vapor accumulation.