Sewer catch basin with gas seal for a petroleum refinery or chemical processing plant

Claim 1

A catch basin assembly connectable to a vertical inlet pipe to a sewer for preventing gases from escaping from the sewer through the catch basin comprising: a. catch basin means having a top end for receiving sewage and having a bottom end means for connection to a vertical inlet pipe connected to a sewer of a petroleum refinery or chemical processing plant, said catch basin means having i. generally vertical walls on the exterior thereof, ii. trough means at said bottom end of said catch basin means and extending completely around the interior of said generally vertical walls of said catch basin means for containing water received in said catch basin means, iii. an inner generally vertical wall connected to said trough means defining a top opening through which liquids overflowing from said trough means can flow and a bottom opening through which said liquids overflowing from said top circular opening can exit, said inner generally vertical wall of said trough means having a height less than the height of said generally vertical wall of said catch basin means, c. lid means lying in said trough and over and around said top opening to prevent gases from traveling through said opening when said trough means is filled with water while permitting said liquids to flow through said top opening, d. cover means lying on top of said catch basin means, said cover means having a plurality of channels therein through which said liquids may flow into said catch basin means, and e. said vertical inlet pipe of said sewer being connected to said bottom opening of said inner generally vertical wall for conveying liquid overflowing from said trough means to said sewer.