Septic tank for alternative sewer systems

Fluid handling – Systems – System with plural openings – one a gas vent or access opening

Patent

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Details

137592, 52 20, 521696, F16K 2400, E02D 2914

Patent

active

047097230

ABSTRACT:
A corrugated plastic side wall (A) extends from a bottom area (14) to an apex area (12). A riser (B) extends from the apex area above the ground level. A ring of steel channel (10) is fastened around the apex area to prevent the apex area from becoming distorted when the soil in which the tank is buried becomes water-laden. A tank bottom wall (122) is domed inward to inhibit exterior hydraulic pressure from flexing the bottom inward and from urging the corrugated side walls adjacent the bottom to compress to a smaller diameter in an accordion-like fashion. Downward projecting can (124) and boxes (126) extend from the domed bottom surface to a flat plane to prevent the dome from flexing outward under the weight of sewage and other fluids in the interior of the tank. At least one annular projection (52) extends around an outlet opening (44) to enable a tank wall portion (54) adjacent the outlet opening and outlet tubing (48) to move relative to the remainder of the tank.

REFERENCES:
patent: D233887 (1974-12-01), Bower
patent: D234461 (1975-03-01), Piotrowski
patent: D239506 (1976-04-01), Myers
patent: 3662918 (1972-05-01), Crawford et al.
patent: 3672103 (1972-06-01), Kost
patent: 3938689 (1976-02-01), de Munnik
patent: 3955705 (1976-05-01), Dubois et al.
patent: 4254885 (1981-03-01), Fouss et al.
patent: 4359167 (1982-11-01), Fouss et al.
patent: 4475845 (1984-10-01), Odill et al.
Hancor Sewage Tank Advertising Brochure, Hancor, Inc., 1982.
Ensembles D'Assainissement Epuration Advertising Brochure, Sotralco.
HBA's Fiberglass Septic Tanks Advertising Brochure, HBA Cast Products Company.
La Fosse Septique En Polyethylene--Advertising Brochure of Wedco, Laval, P. Q.

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