83Roof for tanks commissioned on or after 1 July 2024

83 Roof for tanks commissioned on or after 1 July 2024

83 Roof for tanks commissioned on or after 1 July 2024

(1) A floating roof must—

(a) be made of metal, and

(b) not be open to the atmosphere.

(2) A floating roof must at all times float on the surface of the volatile organic liquid stored in the tank and not rest on the floor of the tank.

(3) A floating roof must have primary closure seals that close —

(a) openings in the floating roof, and

(b) gaps caused by equipment passing through the openings.

(4) A floating roof must have a rim-mounted secondary seal that—

(a) is mounted above a primary seal, and

(b) completely covers the space between the roof edge and the tank wall.

(5) A floating roof must have a mechanical shoe primary seal, or a seal with equal or greater efficacy, that closes spaces between the roof and the walls of the large storage tank.