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An apparatus for straightening fluid flow in a conduit or pipeline, such as an irrigation pipeline, resides in an integral assembly of a conical fluid flow displacement member effective to substantially lineralize the velocity profile of fluid flowing through the pipeline and a plurality of circumfe

An apparatus for straightening fluid flow in a conduit or pipeline, such as an irrigation pipeline, resides in an integral assembly of a conical fluid flow displacement member effective to substantially lineralize the velocity profile of fluid flowing through the pipeline and a plurality of circumferentially spaced vanes extending longitudinally and radially of the conical member and effective to mitigate swirl and eccentric velocity profiles in the flowing fluid. The conical member consists simply of a single cone that is centered in the pipeline by the vanes. A bolt extending through the wall of the pipe and threaded into a nut on a vane secures the straightener in the line.

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1. A flow straightener mounted coaxially in a conduit to substantially linearize the velocity profile of fluid flowing through the conduit, the flow straightener comprising: a flow displacement member including a single cone having a sloped, peripheral surface; anda plurality of vanes non-rotatably

1. A flow straightener mounted coaxially in a conduit to substantially linearize the velocity profile of fluid flowing through the conduit, the flow straightener comprising: a flow displacement member including a single cone having a sloped, peripheral surface; anda plurality of vanes non-rotatably attached to said flow displacement member, said vanes extending laterally from and being equiangularly-spaced on said peripheral surface and having ends spaced from the conduit; anda connector removably attached to at least one of said vanes to respectively connect and disconnect said flow displacement member to and from the conduit. 2. The flow straightener of claim 1, wherein said vanes extend an equal distance upstream and downstream from said cone. 3. The flow straightener of claim 1, wherein at least some of said vanes are aligned radially with one another and form a vane extending diametrically across the interior of the pipeline. 4. The flow straightener of claim 1, wherein said vanes are of length from about 0.5 to about 2.0 times the inner diameter of the conduit. 5. The flow straightener of claim 1, wherein said vanes are of a length equal to about 0.88 times the inner diameter of the conduit. 6. The flow straightener of claim 1, wherein a Beta ratio of said cone is from about 0.45 to about 0.88. 7. The flow straightener of claim 1, wherein a Beta ratio of said cone is from about 0.45 to about 0.88 and said vanes have a length from about 0.55 to about 2.0 times the inner diameter of the conduit. 8. The flow straightener of claim 1, said cone including a peripheral edge, wherein the slope of said peripheral surface is from about 39° to about 75° to the plane defined by said peripheral edge of said cone. 9. The flow straightener of claim 1, wherein said cone comprises a hollow frustum of a cone open at its upstream and downstream ends. 10. A flow straightener for use in a pipeline having a fluid flow path for conveying fluid therethrough in a given direction, the flow straightener comprising: a fluid displacement member;a plurality of swirl mitigating vanes,said displacement member consisting essentially of a single cone for installation coaxially within the pipeline,said cone having a sloped wall facing in the upstream direction and having a peripheral edge at its downstream end spaced inwardly from the wall of the pipeline,said cone being effective to substantially linearize the velocity profile of the fluid flowing through the pipeline and to stabilize fluid flow proximate the displacement member,said vanes extending longitudinally and radially of said cone,said vanes being circumferentially spaced from one another and extending radially substantially to the radius of the interior of the pipeline,said vanes being adjacent to and spaced from the wall of the pipeline for positioning said cone coaxially within the pipeline and being effective to mitigate swirl and eccentric velocity profiles in the fluid flowing through the pipeline, anda connector removably secured to at least one of said vanes to connect and disconnect the fluid displacement member within the pipeline. 11. The flow straightener of claim 10, wherein said vanes extend continuously from a location upstream from said cone, over the surface of said sloped wall and to a location downstream from said cone. 12. The flow straightener of claim 10, wherein at least some of said vanes are aligned radially with one another and form a vane extending diametrically of the interior of the pipeline. 13. The flow straightener of claim 10, wherein said vanes are of an even number, spaced circumferentially and equally from one another and aligned in pairs extending diametrically of the interior of the pipeline. 14. The flow straightener of claim 10, wherein the number of said vanes is from 4 to 8. 15. The flow straightener of claim 10, wherein the number of said vanes is 4, 6 or 8. 16. The flow straightener of claim 10, wherein said vanes are of length from about 0.5 to about 2.0 times the inner diameter of the pipeline. 17. The flow straightener of claim 10, wherein said vanes are of a length equal to about 0.88 times the inner diameter of the pipeline. 18. The flow straightener of claim 10, wherein a Beta ratio of said cone is from about 0.45 to about 0.88. 19. The flow straightener of claim 10, wherein a Beta ratio of said cone is from about 0.45 to about 0.88 and the length of the vanes is from about 0.55 to about 2.0 times the inner diameter of the pipeline. 20. The flow straightener of claim 10, wherein a Beta ratio of said cone is about 0.82 and said vanes are six in number, aligned in respective pairs diametrically of the interior of the pipeline and are of a length equal to about 0.88 times the inner diameter of the pipeline. 21. The flow straightener of claim 10, wherein the slope of the sloped wall is from about 39° to about 75° to the plane defined by the peripheral edge of said cone. 22. The flow straightener of claim 10, wherein a Beta ratio of said cone is about 0.82, the slope of the sloped wall is about 67.5° to the plane defined by said peripheral edge of said cone and the vanes are six in number, aligned in respective pairs diametrically of the interior of the pipeline, extend upstream, downstream and continuously over the surface of said cone and are of a length equal to about 0.88 times the inner diameter of the pipeline. 23. The flow straightener of claim 10, wherein said cone is hollow. 24. The flow straightener of claim 10, wherein said cone comprises a hollow frustum of a cone open at its upstream and downstream ends. 25. An apparatus for straightening fluid flow in a pipeline having a fluid flow path for conveying fluid therethrough in a given direction comprising: a unitary assembly of a fluid flow displacement member;a plurality of fluid flow swirl mitigating vanes,said displacement member consisting essentially of a single cone for installation coaxially within the pipeline,said cone having a sloped wall facing in the upstream direction spaced symmetrically inwardly from the wall of the pipeline, the sloped wall terminating at its downstream end in a peripheral edge spaced symmetrically inwardly from the wall of the pipeline,said cone being effective to substantially lineralize the velocity profile of the fluid flowing through the pipeline and to stabilize fluid flow upstream and downstream of said cone,said vanes being integral with said cone and extending longitudinally and radially of said cone,said vanes being circumferentially and equally spaced from one another and extending radially substantially to but spaced from an inner surface of the pipeline,said vanes being rotatably and slideably engagable with the interior of the pipeline for accommodating positioning of said cone at a selected location coaxially within the pipeline,said vanes being effective to mitigate swirl and eccentric velocity profiles in the fluid flowing through the pipeline, andmeans extendable through the wall of the pipeline and removably engagable with one or more of said vanes for securing the straightener within the pipeline. 26. The apparatus of claim 25, wherein said securing means comprises a first fastener element on the peripheral edge of a vane and a second cooperable fastener element extendable through the wall of the pipeline and engageable with said first fastener element. 27. The apparatus of claim 26, wherein said first fastener element comprises a nut and said second fastener element comprises a mating bolt. 28. The apparatus of claim 25, wherein said cone comprises a hollow frustum of a cone open at its upstream and downstream ends. 29. The apparatus of claim 25, wherein a Beta ratio of said cone is about 0.82, the slope of said sloped wall is about 67.5° to the plane defined by said peripheral edge of said cone and the vanes are six in number, aligned in respective pairs diametrically of the interior of the pipeline, extend upstream, downstream and continuously over the surface of said cone and are of a length equal to about 0.88 times the inner diameter of the pipeline.