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A strainer is disclosed for filtering a flow stream passing therethrough, while reducing vortex shedding and related minimizing noise and vibration. The strainer includes an elongated member which defines a generally longitudinal axis, and having an opening at one end and a closed end at the opposit

A strainer is disclosed for filtering a flow stream passing therethrough, while reducing vortex shedding and related minimizing noise and vibration. The strainer includes an elongated member which defines a generally longitudinal axis, and having an opening at one end and a closed end at the opposite end. The opening has a greater dimension than the closed end. The elongated member includes a plurality of rows of apertures located between the opening and the closed end, with the apertures of each row being of generally equal dimension and located in a plane generally perpendicular to the longitudinal axis. The pluralities of rows of apertures are of distinct dimensions and form a semi-random pattern such that a flow stream passing therethrough causes distinct frequencies associated with each row, which frequencies generally reduce or cancel any pulsation resulting therefrom.

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1. In a gas pipeline, the improvement comprising a strainer for filtering a gaseous flow stream passing therethrough, while reducing vortex shedding and related noise and vibration, which comprises: a) a generally conical elongated member defining a generally longitudinal axis, and having an opening

1. In a gas pipeline, the improvement comprising a strainer for filtering a gaseous flow stream passing therethrough, while reducing vortex shedding and related noise and vibration, which comprises: a) a generally conical elongated member defining a generally longitudinal axis, and having an opening at one end and a closed end at the opposite end, said elongated member having a plurality of rows of apertures located between said opening and said closed end, said apertures of each row being of dimension generally equal to the dimension of the remaining apertures in said row and being located in a plane generally perpendicular to said longitudinal axis, said plurality of rows of apertures including: i) a first row of apertures defining a first series of apertures of predetermined dimension;ii) a second row of apertures located adjacent said first row and defining a second series of apertures having a dimension less than the dimension of said apertures of said first series, at least one of said first and second rows of apertures causing a flow stream passing therethrough to produce a pressure pulsation of a first frequency;iii) a third row of apertures located adjacent said second row and defining a third series of apertures of dimension at least equal to or greater than the dimension of said apertures of said second series; andiv) at least a fourth row of apertures located adjacent said third row and defining a fourth series of apertures of dimension at least equal to or greater than the dimension of said apertures of said third row, at least one of said third and fourth rows causing the flow stream passing therethrough to produce a pressure pulsation of a second frequency that at least substantially reduces the pressure pulsation produced by the first frequency. 2. The strainer according to claim 1, wherein said closed end has a generally arcuate shape to reduce the eddy of the passing flow stream at a location downstream of said plurality of rows of apertures. 3. The strainer according to claim 2, wherein said apertures of each said series are of generally circular shape. 4. The strainer according to claim 3, wherein the diameter of each aperture of said second series is approximately 6 mm and the incremental diameter difference for other apertures having a dimension greater than the dimension of said second series of apertures generally increases by at least 1 mm and said difference of aperture dimensions is sufficient to cause the frequency produced by said second series of apertures to substantially nullify the pressure pulsation produced by the frequency produced by said first series of apertures. 5. The strainer according to claim 4, wherein each of said rows of apertures is separated from each adjacent row by approximately 2 mm. 6. The strainer according to claim 5, wherein said elongated member has a thickness of approximately 9 mm. 7. The strainer according to claim 6, wherein said plurality of rows of apertures further includes: a fifth row of apertures located adjacent said first row of apertures on the opposite side of said second row and defining a fifth series of apertures of a dimension at least greater than the dimension of said apertures of said first series; andat least a sixth row of apertures located adjacent said fourth row of apertures and defining a sixth series of apertures of a dimension at least greater than or equal to the dimension of said apertures of said fourth series. 8. The strainer according to claim 7, wherein said plurality of rows of apertures further includes: a seventh row of apertures located adjacent said fifth row of apertures and defining a seventh series of apertures of a dimension at least equal to or less than the dimension of said apertures of said fifth row of apertures;an eighth row of apertures located adjacent said seventh row of apertures and defining an eighth series of apertures of a dimension at least equal to or less than the dimension of said apertures of said seventh row of apertures; andat least a ninth row of apertures located adjacent said eighth row of apertures and defining a ninth series of apertures of a dimension at least equal to or less than the dimension of said apertures of said eighth row of apertures. 9. The strainer according to claim 8, wherein said plurality of rows of apertures extending from said ninth row to said sixth row of apertures is repeated as a continuous arrangement between said opening and said close end. 10. The strainer according to claim 9, wherein said rows of apertures are formed and positioned in a staggered manner such that a plane passing through the longitudinal axis of said elongated member will intercept alternate rows of apertures. 11. The strainer according to claim 8, wherein said elongated member is structured and adapted to be installed in a flow stream system with said closed end facing the direction of the flow stream. 12. The strainer according to claim 1, wherein said apertures in each of said plurality of rows are of a dimension distinct from said apertures of the next adjacent row to define a random arrangement of said plurality of rows. 13. The strainer according to claim 1, wherein said elongated member is structured and adapted to be installed in a flow stream system with said closed end facing the flow stream. 14. The strainer according to claim 1, wherein said apertures are generally rectangular. 15. A strainer for filtering a flow stream passing therethrough, while reducing vortex shedding and substantially minimizing related noise and vibration, which comprises: a) a generally conical elongated member defining a generally longitudinal axis, and having an opening at one end and a closed end at the opposite end, said elongated member having a plurality of rows of apertures located between said opening and said closed end, said apertures of each row being of generally equal dimension and located in a plane generally perpendicular to said longitudinal axis, said plurality of rows of apertures including: i) a first row of apertures, each said aperture being of about 6 mm in diameter;ii) a second row of apertures, each said aperture being of about 7 mm in diameter, and located adjacent said first row;iii) a third row of apertures, each said aperture being of about 8 mm in diameter, and located adjacent said second row;iv) a fourth row of apertures, each said aperture being of about 8 mm in diameter, and located adjacent said third row;v) a fifth row of apertures, each said aperture being of about 7 mm in diameter, and located adjacent said fourth row;vi) a sixth row of apertures, each said aperture being of about 6 mm in diameter, and located adjacent said fifth row;vii) a seventh row of apertures, each said aperture being of about 6 mm in diameter, and located adjacent said sixth row;viii) an eighth row of apertures, each said aperture being of about 7 mm in diameter, and located adjacent said seventh row; andix) at least a ninth row of apertures, each said aperture being of about 8 mm in diameter, and located adjacent said eighth row, wherein said rows of apertures cause a flow stream passing therethrough to produce at least two pressure pulsation frequencies which substantially nullify each other. 16. The non-shedding strainer according to claim 15, wherein said plurality of rows of apertures extending from said first row to said ninth row of apertures is repeated as a continuous arrangement between said opening and said closed end. 17. The non-shedding strainer according to claim 16, wherein said apertures in each of said plurality of rows of apertures are of a dimension distinct from said apertures of the next adjacent row to define a random arrangement of said plurality of rows of apertures. 18. A method for filtering a flow stream comprising: a) positioning a strainer within a conduit, said strainer including: i) an elongated member having a generally tapered conical configuration and defining a generally longitudinal axis, said elongated member having an opening at one end and a closed end at the opposite end; andii) a plurality of rows of apertures defined by said elongated member, said plurality of apertures being located between said opening and said closed end, said apertures in each row being of generally equal dimension and located in a plane generally perpendicular to said longitudinal axis, said plurality of rows of apertures including: 1) a first row of apertures defining a first series of apertures of predetermined dimension;2) a second row of apertures located adjacent said first row and defining a second series of apertures having a dimension less than the dimension of said apertures of said first series, at least one of said first and second rows of apertures causing a passing flow stream to produce a pressure pulsation of a distinct first frequency;3) a third row of apertures located adjacent said second row and defining a third series of apertures of dimension at least equal to or greater than the dimension of said second series of apertures; and4) at least a fourth row of apertures located adjacent said third row and defining a fourth series of apertures of dimension at least equal to or greater than the dimension of said third series of apertures of said third row; andb) passing a flow stream through said conduit and said strainer wherein a portion of said flow stream that passes through at least one of said third and fourth rows causes said flow stream portion to produce a pressure pulsation of a second distinct frequency that substantially nullifies any pressure pulsation produced by a portion of said flow stream that passes through at least one of said first and second rows of apertures producing said first distinct frequency thereby reducing vortex shedding and associated noise and vibration.