What is the primary function of flow shut-off devices in underground storage tank installations?

The primary function of flow shut-off devices in underground storage tank installations is to stop the flow during delivery. These devices are critical during the refueling process to ensure that the flow of fuel is halted immediately in the event of an overflow or other issues that could arise during delivery.

When a vehicle or equipment is being filled with fuel, the shut-off devices enhance safety by preventing excess fuel from spilling, which can pose environmental risks and create hazardous conditions. This automatic shutdown feature is essential for maintaining safety standards and avoiding incidents that could arise from overfilling a tank.

While the prevention of leakage, management of vapor release, and monitoring of fuel levels are important aspects of underground storage tank operations, they are not the primary purpose of flow shut-off devices. Instead, these functions are typically managed by other systems and technologies designed for those specific roles in UST operations.