Owens-corning Fiberglas Corporation

Peter J Pugnale

Andrew A Mance

Michael J Messmer

John M Clark

William R Penland

A double-wall tank having inner and outer walls bonded to connecting hollow annular ribs. Passageway means through the ribs enable leak-detecting liquid to fill the spaces between ribs, within ribs, and between end caps.

Double-wall underground tank and method of making

A double-wall tank having inner and outer walls bonded to connecting hollow annular ribs. A passageway through the ribs enable leak-detecting liquid to fill the spaces between ribs, within ribs, and between end caps.

Double-wall underground tank

Sumps are mounted on manway fittings of underground tanks, and all piping runs are routed through a sump. Underground portions of pipes between a sump and a point above ground are provided with a double wall. Filling spills and leakage from pipes into the environment are thereby generally prevented.

Underground tank sump and piping system

An aboveground reservoir is connected to the space between inner and outer tanks of an underground double-wall storage container for liquids. Leak detecting liquid fills the space between the tanks and extends to a surface level in the reservoir. Sensing means detects a drop in the level of the liquid in the reservoir and activates a signal when a leak develops in either of the inner and outer tanks.

Growing community of inventors

The Woodlands, TX, United States of America

Peter J Pugnale