Fixed Roof And Floating Roof Tanks

A traditional and typical fixed roof storage tank consists of a cylindrical steel shell with a dome or cone shaped roof that is attached to the tank shell.

Fixed roof and floating roof tanks.

An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate. An internal floating roof tank is a floating roof tank fixed an extra fixed roof on the floating roof to prevent floating roof from wind and rain and guarantee the quality of the stored oil. Types of fixed roof tanks 8 figure 1 4. As with the internal floating roof tanks the function of the fixed roof is not to act as a vapor barrier but to block the wind.

Tanks with external floating roofs are used primarily to contain liquids with high vapor pressures when the vapor emissions from fixed roof tanks would exceed the standards set by the local jurisdiction. The floating roofs can be either external i e with open top tanks or internal i e inside fixed roof tanks. Domed external floating roof tanks usually result from retrofitting an external floating roof tank with a fixed roof. Internal floating roof tank can be used to store gasoline jet fuel and other volatile oil and liquid chemicals like aldehydes alcohols methanol ethanol ketones acetone benzene benzene toluene xylene styrene.

Fixed roof storage tanks. Storage tank capacities and levels 15. The roof rises and falls with the liquid level in the tank. The type of fixed roof most commonly used is a self supporting aluminum dome roof which is of.

Double deck type floating roof 10 figure 1 6. Double deck floating roof tank 13 figure 1 8. However by reducing emissions the increased costs can be offset or justified on the basis of reduced product loss though evaporation a product savings and less impact to the environment. Floating roof tanks are generally about twice as expensive to construct as fixed roof tanks so there is a trade off of risk against cost.

Single deck pontoon type floating roof 9 figure 1 5. It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid. Single deck floating roof tank 12 figure 1 7. Perfect designed internal floating roof storage tank is the best method to control the evaporation loss of the fixed roof tank.