STORAGE TANK WITH SECONDARY CONTAINMENT

摘要

STORAGE TANK WITH SECONDARY CONTAINMENT A storage tank with secondary containment includes a cylindrical inner tank which is mounted within a rectangular secondary containment with a horizontal flat base and vertical upstanding walls. A portion of the inner tank projects above the side walls to allow access for filling etc.. The area between the top edge of the vertical side wall and the adjacent portion of the tank is covered by a respective one of a plurality of cover panels each of which includes a top edge which is wedged under a flange on the tank and extends therefrom downwardly and outwardly to a vertical flange bolted to the vertical side wall. The cover panel thus acts to shed rainwater and the like. The cover panels are provided with explosion vents each in the form of a duct extending upwardly from the cover panel so as to direct flames and explosion gases away from the top part of the inner tank. Each duct is covered by a flap member which can open under the pressure from the gases but closes under its weight to prevent the reentry of oxygen thus extinguishing combustion within the volume between the tank and the secondary containment.