The roof rises and falls with the liquid level in the tank.
Floating roof system.
As opposed to a fixed roof tank there is no vapor space in the floating roof tank except for very low liquid level situations.
In principle this eliminates tank breathing loss and greatly reduces the evaporative loss of the stored liquid.
Our floating roofs are used by all major oil companies as well as oil storage and pipeline companies because they are safer more cost effective and more environmentally friendly than other floating roof systems.
It consists of an open topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid.
Allentech is a privately held manufacturer and erector of internal floating roofs and perimeter seal systems for above ground storage tanks and covers for api separator basins.
The floating roofs can be either external i e with open top tanks or internal i e inside fixed roof tanks.
Sandborn roofs manufactures the patented sandborn full contact internal floating roof system ifr.