when the tank is empty, the floating roof will float down, and the pipe will folded by the gear case, when the tank was filled In the construction, the Bending radius of the corrugated pipe is 15*D, do not bend the corrugated pipe so frequently under the installation.Upper and below hinge mount ought to be on the same horizontal.The slope of the drain-pipe is 1:1000The upper and below hinge mount were welded when hinge mount is fixed.connected the folding pipe to upper and below hinge mount and then install the gear caseMake sure that the folding pipe floating up and down very well, then install the transition tube in middleInstall the corrugated pipe at lastWhen the construction is installed, please have a water pressure test and the pressure should be 0.6Mpa.

This construction is installed in the huge oil tank, when the tank is empty, the floating roof will float down, and the pipe will folded by the gear case, when the tank was filled oil in it, the floating roof will float up with the oil, at the same time  the pipe will stretch, one end of the pipe connect the upper roof with corrugated pipe and the other end connect the bottom of the tank. When it rain or snow, water will flow through the pipe and it can deduce the pressure from the floating roof.

central Drainage for huge oil tank