March 2018

Terminals and Storage

Prevent buckling of tanks with external rafters

Most cone roof tanks are designed with roof-supporting structures inside the tank.

Tharakan, J., Suncor Energy Inc.

Most cone roof tanks are designed with roof-supporting structures inside the tank. If the vapor space of the tank is corrosive, then the roof structure will corrode, causing tank integrity issues. Coatings for corrosion mitigation are ineffective for internal roof rafters because the coating is prone to peeling due to flexing of the roof plates that rest on the rafters. For this reason, tanks with corrosive vapor space are sometimes designed with external rafters. In such designs, the bottom flange of the rafters is welded to the roof plates. Tanks with external rafters Since these tanks are not common, the American Petroleum Institute’s tank design code API 650 is not written with this ty

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