Straightening vanes are installed in the upstream section of meter tubes to reduce flow disturbance preceding the orifice plate. Disturbance is often created by complex piping or valves which precede the orifice metering section. As flow passes through the vane bundle, this disturbance is straightened and smoothed to a normal flow pattern. Straightening Vanes are economical because their use often allows sufficient reduction of upstream meter tube length, so that a smaller building or enclosure is possible.

Straightening vanes are manufactured in a variety of sizes in carbon steel and stainless steel. They are in accordance with recommendations of the A.G.A., A.S.M.E., as well as numerous other societies and associations. Two standard vane bundles are shown. Each type bundle is available as a Flange model and a Line model.

The tubes in each vane bundle are welded at both ends at each point of tangency. Tube inlets and outlets are reamed to permit minimum pressure drop. Special spacer lugs on each vane bundle assure a perfect fit in the meter tube. The Flange model is held in the line by a flange ring which is clamped between two pipe line flanges.

Method of Installing Line Model Vane

The Line Model vane is first located in the pipe with it's welded pad squarely beneath the tapped hole. An Allenhead set screw is installed so that it seats into a counter sunk hole in the welded pad. The screw is tightened to exert pressure on the welded pad, clamping the vane bundle securely in the line. To seal off the tapped hole in the pipe, a half-coupling is located over the set screw and a steel pipe plug inserted and tightened These vanes are intended for horizontal installation only. For vertical service, a flange would be more suitable.

Techno-Flow Standard Straightening Vane Bundles 


Size And Type Of Vane Installation

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