Patent ID: 8758486

Claim:
A method of designing a nozzle arrangement for directing a jet of pressurized gas into a non-round aperture in a tube sheet holding a filter element; the method comprising: (a) designing a nozzle arrangement to generate a jet of pressurized gas having a non-round cross-sectional shape that is a same general cross-sectional shape as a non-round aperture in a tubesheet holding a filter element; (i) the nozzle arrangement including at least one nozzle; (ii) each nozzle having an unobstructed flow channel; and (iii) each nozzle having a tubular wall, containing the unobstructed flow channel, with a free end defining an opening in communication with the unobstructed flow channel, the tubular wall further having at least one open slot extending from the free end along the tubular wall.