Backwash method and apparatus

  • US 5,114,596 A
  • Filed: 10/16/1990
  • Issued: 05/19/1992
  • Est. Priority Date: 10/16/1990
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for cleaning a plurality of filter elements having inner cores vertically positioned within a filter vessel which has a tube sheet dividing the filter vessel into a lower filter compartment and an upper plenum compartment, said filter elements being positioned within said filter compartment and having upper portions that are in fluid communication with said plenum compartment through openings formed in said tube sheet, said method comprising:

  • draining substantially all of the liquid from the filter compartment;

    establishing a pressurized condition in said filter compartment and said filter elements that is sufficient to support a predetermined volume of backwash liquid in said plenum compartment above said tube sheet;

    increasing the pressure in said plenum compartment and reducing the pressure in said filter compartment so as to cause said predetermined volume of backwash liquid to move rapidly downward through the cores of said filter elements and surge radially outward through the filter surfaces thereof.

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