Where are vent restriction devices installed in underground storage tanks?

Vent restriction devices are specifically installed in the vent opening of underground storage tanks (USTs). These devices play a crucial role in regulating the flow of vapors and ensuring safety by preventing over-pressurization or vacuum conditions within the tank. By controlling the release of vapors, these devices also help to minimize the risk of fire and environmental contamination.

The vent opening is critical for allowing air to enter and gases to exit during the filling and emptying processes of the UST. Installing the vent restriction device at this location allows it to perform its function effectively, ensuring that the tank operates safely and within regulatory guidelines.

In summary, the vent opening is the appropriate and strategic location for vent restriction devices to perform their intended functions efficiently.