Today the emphasis is on controlling atmospheric pollution as well as on safety.
Floating roof system.
The roof rises and falls with the liquid level in the tank.
In principle this eliminates tank breathing loss and greatly reduces the evaporative loss of the stored liquid.
Sandborn roofs manufactures the patented sandborn full contact internal floating roof system ifr.
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.
As opposed to a fixed roof tank there is no vapor space in the floating roof tank except for very low liquid level situations.
Floating roof systems floating roofs were designed more than 100 years ago as a safety precaution to keep explosive gasses from building up between the roof of a tank and its petroleum contents.