Patent ID: 7874764
Filing Date: 2011-01-25
Classification: B65D

Abstract:
1. A secondary containment system for an above-ground petroleum storage tank, said system comprising: a berm rising above the ground surrounding the tank and spaced apart from the tank for defining a petroleum retention basin above the tank; an impermeable liner for extending across the ground between the tank and said berm, an inner end of said liner being sealable engaged with at least one of a ring wall or slab supporting the tank, a steel shell between a pair of bottoms of the tank and a shell of the tank; at least one water drain formed through said liner, said drain including means for sensing the presence of liquid petroleum in said drain; means for closing said drain to prevent liquid petroleum from passing therethrough and being discharged from said basin; and an indicator device for providing at least one of an audible signal and a visual signal indicating that liquid petroleum is sensed in said drain.