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.
External and internal floating roof tank.
An external floating roof tank is a storage tank commonly used to store large quantities of petroleum products such as crude oil or condensate.
External floating roof and internal floating roof.
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.
Compared with external floating roof tank internal floating roof tank is a promising tank with more advantages also its applications are wider and wider.
Domed external floating roof tanks have the heavier type of deck used in external floating roof tanks as well as a fixed roof at the top of the shell like internal floating roof tanks.
The roof rises and falls with the liquid level in the tank.
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.
It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid.