So far perfect designed internal floating roof tank is the best and the least investment method to control volatilization loss from the fixed roof tank.
External and internal floating roof tank.
It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid.
Compared with external floating roof tank internal floating roof tank is a promising tank with more advantages also its applications are wider and wider.
External floating roof and internal floating roof.
An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate.
The roof rises and falls with the liquid level in the tank.
Because the flexible floating roof deck can float up and down to close to the liquid level gas space above the liquid level can be greatly reduced thereby greatly reducing the evaporation.
The floating roofs can be either external i e with open top tanks or internal i e inside fixed roof tanks.
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.