Xerxes Corporation

Michael G Zais

Robin Berg

Kaushik Mallick

Brian Garcia

John R Burwell

Roberto Sanchez

A double walled riser sump has an annular space between the two walls. The provision of the annular space provides for monitoring the integrity of the two walls of the sump. The two walls of the sump are preferably separated by a thin film or a distance fabric that allows the passage of fluids, and preferably liquids. The annular space may be in fluid communication with a reservoir holding a monitoring fluid and positioned near the top of the sump to be easily accessible. In some embodiments, a top of the riser sump is also double walled and the top annular space is in fluid communication with the annular space between the vertical walls. If a leak develops in either wall of the sump, a corresponding drop in the fluid level of the reservoir will occur.

Double walled containment sumps

A water-tight fiberglass septic tank is strong enough to withstand live loads. The fiberglass septic tank is preferably designed with integral ribs to for structural strength. In one preferred embodiment, the tank is made in two unequal halves. The lower half comprises the major portion of the tank and includes a bottom, two endwalls and two sidewalls. The upper half comprises a cover. This arrangement allows the horizontal seam to be placed above the internal waterline, thereby protecting the seam from exposure to sewage. At least one of the endwalls includes a raised top portion that allows a pipe to be located near the top of the lower portion without passing through the seam between the upper and lower portions of the tank. The endwalls are also curved to allow for angled inlet and outlet pipe connections. The ribs are preferably internal and hollow. The lower portion of the tank is also preferably flat bottomed. A provision has been made for a self-locating baffle if required. In another preferred embodiment, a cylindrical male molded tank is created on a mandrel. The tank circumference is stepped, which both provides for built-in stepped ribs and eases removal of the tank from the mandrel. In preferred embodiments of the tank, a baffle is located at the position of a stepped rib so that the stepped rib supports the baffle.

Residential septic tank with seams above sewage line and residential septic tank with stepped ribs

Residential septic tank

Growing community of inventors

Lakeville, MN, United States of America

Michael G Zais