Secondary containment for underground storage tank riser

Details Secondary containment for underground storage tank riser Secondary containment for underground storage tank riser

1998-03-02

1999-03-16

Knight, Anthony

Pipe joints or couplings

Having plural independent paths

For concentric tubes or pipes

141 86, 141311A, F16L 2700

Patent

active

058820450

ABSTRACT:
A secondary containment system is provided for use in preventing leakage to or from an underground storage tank at a joint where a riser line connects to the tank. The system includes a secondary riser tube for surrounding the riser line and a sealing ring for providing a seal between the outer wall of the storage tank and the secondary riser tube. The sealing ring has a sleeve for sealing against the outer wall of the secondary sealing tube and a flexible bell-shaped skirt for sealing against the outer wall of the storage tank. A support bracket clamps to the outer wall of the riser line and includes three threaded arms extending radially outward. Three acorn nuts cooperate with the threaded arms and can be jacked in an outward direction against the inner wall of the secondary riser tube to fix the riser line and the secondary riser tube to one another and hold the secondary riser tube pressed downwardly to hold the flexible skirt of the sealing ring into sealing engagement with the outer wall of the storage tank.

REFERENCES:
patent: 4958957 (1990-09-01), Berg et al.
patent: 5100024 (1992-03-01), Bravo
patent: 5295760 (1994-03-01), Rowe
patent: 5441082 (1995-08-01), Eskew et al.
patent: 5501472 (1996-03-01), Brancher et al.

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