External floating roof tank

It consists of an open- topped cylindrical steel shell equipped with a roof that floats on the surface of the stored liquid.

The support legs are usually retractable to increase the working volume of the tank.

External roof tanks are usually installed for environmental or economical reasons to limit product loss and reduce the likelihood of emission of volatile organic compounds (VOCs) and other potential air pollutants.

Normally, the roof of the tank rests directly on the surface of the stored liquid, leaving little vapor space and consequently leading to a much lower risk of rim space fire.

A hose is the shortest quickest route, Other drain systems are available both rigid and semi-rigid.