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Apparatus for passive removal of subsurface contaminants

United States Patent

*** EXPIRED ***
June 24, 1997
View the Complete Patent at the US Patent & Trademark Office
Savannah River National Laboratory - Visit the Technology Transfer Website
An apparatus is provided which passively removes contaminated gases from a subsurface. The apparatus includes a riser pipe extending into a subsurface which has an exterior end in fluid communication with a valve. When well pressure is greater than atmospheric pressure, the valve opens to release contaminants into the atmosphere, and when well pressure is less than atmospheric pressure, the valve closes to prevent flow of air into the well. The valve assembly of the invention comprises a lightweight ball which is lifted from its valve seat with a slight pressure drop between the well and the atmosphere.
Pemberton; Bradley E. (Aiken, SC), May; Christopher P. (Fairfax, VA), Rossabi; Joseph (Aiken, SC)
Westinghouse Savannah River Company, Inc. (Aiken, SC)
08/ 446,372
May 22, 1995
The United States Government has fights in this invention pursuant to Contract No. DE-AC09-89-SR18035 between the U.S. Department of Energy and Westinghouse Savannah River Company.