How a Flow Conditioner Works - Flow Conditioning Basics

The accuracy of most flow meters depends on the flow profile of the substance in the piping system. Upstream disturbances have been observed to have the greatest  impact on the flow profile of the flow stream which in turn affects flow meter accuracy. The desired flow profile can be achieved in a typical installation without flow conditioning using 25 to 40 pipe diameters of straight run piping before the flow element and about 4 or 5 pipe diameters downstream of the element. These requirements vary quite considerably according to the upstream (and downstream) disturbances and the beta ratio.  In most practical application of flow measurement, it is not always possible to provide sufficient straight run to secure a “fully developed flow profile. What practical solution then exists if sufficient straight run pipe is not achievable?  The engineering solution is always some form of flow conditioning using devices called flow conditioners.

Recommended Minimum Straight Run Pipe Lengths without Flow Conditioner
Where sufficient straight run pipe lengths can be provided, a flow conditioner is
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