Floating roof

Floating roof means a storage vessel cover consisting of a double deck, pontoon single deck, internal floating cover or covered floating roof, which rests upon and is supported by the petroleum liquid being contained, and is equipped with a closure seal or seals to close the space between the roof edge and tank wall.

Source

40 CFR § 60.111

Scoping language

As used in this subpart, all terms not defined herein shall have the meaning given them in the Act and in subpart A of this part.