What must be done with tank vents and openings that are not liquid-tight during installation?

The appropriate action for tank vents and openings that are not liquid-tight during installation is to lift them above the flood level. This is critical to prevent potential flooding or contamination of the tank with liquids, which could compromise the integrity of the stored substances. Ensuring that vents and openings are above flood level helps mitigate risks associated with environmental conditions, such as heavy rainfall or flooding, which could lead to water entering the tank.

Keeping these openings elevated ensures compliance with safety and regulatory standards, which aim to protect both the tank's contents and the environment. It is essential for maintaining the functionality of the tank and for preventing hazardous situations that could arise from liquid ingress. This method is also a proactive measure to help manage pressure changes within the tank and reduce the risk of vapor release, further ensuring safe operation.