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Title: Apparatus for passive removal of subsurface contaminants

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.
Inventors:
 [1];  [2];  [1]
  1. (Aiken, SC)
  2. (Fairfax, VA)
Issue Date:
OSTI Identifier:
871011
Assignee:
Westinghouse Savannah River Company, Inc. (Aiken, SC) SRS
Patent Number(s):
US 5641245
Contract Number:
AC09-89SR18035
Research Org:
WESTINGHOUSE SAVANNAH RIVER CO
Country of Publication:
United States
Language:
English
Subject:
apparatus; passive; removal; subsurface; contaminants; provided; passively; removes; contaminated; gases; riser; pipe; extending; exterior; fluid; communication; valve; pressure; atmospheric; release; atmosphere; closes; prevent; flow; air; assembly; comprises; lightweight; ball; lifted; seat; slight; drop; valve seat; pressure drop; fluid communication; atmospheric pressure; valve assembly; contaminated gas; subsurface contaminants; contaminated gases; riser pipe; subsurface contaminant; surface contaminants; /405/166/588/

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