§ 41953 Floating Roof Tank Requirements

• •A floating roof is a special kind of cover that sits on top of liquid in a big tank, like gasoline, and has a seal to keep the liquid from escaping.
• •This rule does not apply if the liquid in the tank has a very high pressure (11.0 pounds per square inch or more).
• •All tools used to measure or take samples from the tank must be tightly sealed to prevent gas leaks, except when they are actually being used.

Imagine a big gas tank at a gas station. The tank has a special cover that floats on top of the gasoline inside.

This cover must have a good seal around the edges to keep the gasoline fumes from escaping. Also, any tools used to check the gasoline level must be tightly closed when not in use to prevent leaks.