Subterranean tank leak containment and detection system and method

Abstract From the Canadian patent

An improved system for containment and detection of leakage of petroleum products from a subterranean storage tank is disclosed wherein the tank is provided with leak sensing means positioned at one end of the tank and the tank, together with the leak sensor, is enclosed in an impervious enclosure which is sealed about the tank to prevent actuation of the leak sensor except due to leakage from the tank. In one form the leak sensor may by housed in a perforated duct which extends through and is sealed within the enclosure permitting access to the leak sensor and the interior of the enclosure in the event that a leak is detected. A preferred material for use in making the enclosure is welded …