Where should vent outlets be located to ensure safety against fire hazards?

Vent outlets should be located above grade for several reasons primarily related to safety against fire hazards. When vent outlets are positioned above grade, they help ensure that any potentially flammable vapors or gases emitted from the underground storage tank are directed away from ground level, where ignition sources are more likely to exist. This placement reduces the risk of vapor accumulation, which can lead to an increased likelihood of fire or explosion if these gases encounter an ignition source.

Additionally, placing vent outlets above grade aids in proper ventilation of the system. Effective ventilation is crucial for allowing the pressure inside the tank to equalize with atmospheric pressure, particularly during filling and dispensing operations. By maintaining an unobstructed pathway for vapors to escape, above-grade vent outlets help prevent damage to the tank and minimize the potential for hazardous situations.

Choosing an appropriate location for vent outlets is critical in adhering to safety standards and regulations aimed at protecting both people and the environment from fire risks associated with underground storage tanks.