Patent ID: 6698610
Filing Date: 2004-03-02
Classification: B29C,B65D

Abstract:
A triple-walled underground storage tank (UST) comprising:(a) a generally cylindrical primary wall adapted for the containment of liquid materials, terminating in two dome-shaped ends; (b) a secondary wall encircling substantially the entirety of said primary wall and providing secondary containment for said liquid material, wherein a first annulus is provided between substantially the entirety of said primary and secondary wall through which liquid may flow; and (c) a tertiary wall encircling substantially the entirety of said secondary wall and providing tertiary containment for said liquid materials, wherein a second annulus is provided between substantially the entirety of said tertiary and secondary walls through which liquid may flow; (d) wherein said first annulus and said second annulus are not in fluid communication with each other and a space interior to the primary wall wherein said liquid materials are contained; and (e) wherein the relationship between the primary wall and the secondary wall is such that fluid flow is permitted through substantially the entire first annulus, and the relationship between the secondary wall and the tertiary wall is such that fluid flow is permitted through substantially the entire second annulus and wherein at least one of said first annulus and said second annulus is substantially filled with monitoring liquid.