Storage tank

摘要

A storage tank having a floating roof and a roof drainage system comprising a flexible conduit extending between the roof and a drain pipe adjacent the base of the tank, the lower end of the conduit being sealed relative to the drain pipe and there being a connection between the upper end of the conduit and the upper surface of the roof so that rainwater accumulating on the roof can pass down the conduit to the drain pipe, and the roof, adjacent the top of the conduit being apertured and the conduit being capable of being withdrawn therefrom and replaced without the need to empty the tank.