"Internal floating roof" means the cover or roof of a fixed-roof tank, which rests upon or is floated upon the petroleum liquid contained in the tank, and that is equipped with a closure seal or seals to close the space between the roof edge and tank shell.
N.H. Admin. Code § Env-A 1203.17
(See Revision Note at chapter heading for Env-A 1200) #9933, eff 6-1-11