Abstract
Many aluminum dome roofs have been installed on external floating roof tanks in USA and Europe in recent 20 years. After the Clean Air Act Amendments were promulgated by US Federal Government in 1990, the evaporative emission from the external floating roof due to both wind and solar heat was regulated to be reduced. The aluminum dome roof is the most effective solution for reducing these emissions. This paper explains the situation, the history, the structure and the design criteria of the aluminum dome.