Floating Roof Tank

Definition - What does Floating Roof Tank mean?

Floating Roof Tank is a kind of an atmospheric storage tank used for storing large amounts of petroleum products like condensate and crude oil. It contains a cylindrical steel shell with an open top that is equipped with a roof which floats on the surface of the stored liquid. The roof falls and rises along with the level of fluid in the tank. It reduces the breathing losses and also eliminates the evaporative losses of the stored liquid. The tank contains a rim seal system between the roof and the tank shell to reduce rim evaporation.

Petropedia explains Floating Roof Tank

Floating Roof Tanks are permitted to be used by the United States environmental protection agency when the vapor pressure of the product is less than 11.2 psia but greater than 0.5 psia. These tanks are not suitable to be used when the products are not stabilized. Their main aim is to provide efficient and safe storage to the volatile products with minimum vapor loss. The Tanks are designed to provide protection from elements like lightning, with a floating roof. These tanks are available in different sizes and shapes. Their manufacture and design is affected by several factors such as temperature, pressure, chemical properties, shape and materials used for construction. The main disadvantage of the Floating Roof Tanks is that snow and rain water gets accumulated on the roof causing the roof to sink.

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