Supplemental lid for containment sump

摘要

An apparatus and method for providing a water impenetrable barrier between an underground duct and an access opening. The apparatus is particularly well suited to cover a secondary opening in a containment sump of an underground storage tank or the manway of a sanitary sewer, catch basin or other manhole system. The apparatus includes a lid, inflatable seal and pressurized tank contained within the lid to inflate the seal. When sealed to the access opening, the lid restricts the inflow of water or other debris into the interior of the underground duct and restricts removal of the lid.

主权项

1. A secondary lid that restricts inflow of fluids into an interior of a containment sump of an underground storage tank, said containment sump having a secondary access opening having a concentric outer rim, an inner ledge and an annular sleeve extending upward between said outer rim and said inner ledge, said secondary lid comprising:
concentric top and bottom plates and an annular collar extending between the top and bottom plates, wherein an outer edge of the bottom plate contacts the ledge of said secondary access opening of said containment sump; first and second spaced apart flanges extending outwardly from said collar approximately parallel with respect to each other; an expandable pneumatic seal positioned between said first and second spaced apart flanges, wherein when the seal is expanded the seal is in sealing contact with both said flanges, said annular collar of said lid, and said annular sleeve of said secondary access opening of said containment sump; a pressurized tank contained between said top and bottom plates and coupled in fluid communication with said pneumatic seal; and a flow regulator coupled in line between said pressurized tank and said pneumatic seal to control the air delivered to the pneumatic seal.