Double wall tank manway system

Details Double wall tank manway system Double wall tank manway system

1986-10-09

1987-08-11

Hall, George T.

Receptacles

Closures

Superposed closures for common opening

220465, 220 5A, B65D 5118

Patent

active

046855858

ABSTRACT:
A double wall manway assembly for double wall tanks intended primarily for underground use, wherein an inner wall provides primary fluid containment and an outer wall provides secondary fluid containment, and a monitor between the walls can detect leakage past the inner wall into the space between the walls. The double wall manway assemby of the invention includes a riser conduit extending through apertures in the two tank walls and having an in-turned inner flange and an out-turned outer flange, with inner and outer cover members removably sealingly engaged over the respective inner and outer flanges. The space within the riser between the two covers communicates with the space between the two tank walls through one or more vent holes through the wall of the riser, for conducting any fluid leakage through the inner cover flange seal to the monitor between the tank walls. In some forms of the invention, a plurality of pipe fittings are embodied in the double wall manway as structural parts thereof.

REFERENCES:
patent: 2014861 (1935-09-01), Neely
patent: 3848765 (1974-11-01), Durkop

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