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EMERSON Vortex Flow meter in Bidirectional flow measurement

Can EMERSON Vortex Flow meter measure Bidirectional flow with a single shedding element or two shedding elements are required for Bidirectional flow measurement ?

ATANU GHOSHAL
  • Jared Drennen
    Hi Atanu - due to the unique design of vortex shedder bars, and the placement of the flappers behind, it is not possible to read flow in the reverse direction using a single Vortex meter. There are plenty of other technologies that can measure bidirectional flow such as Magnetic Flow Meters (for conductive liquids) or Coriolis Flow Meters (for liquids or gases). If you decide to pursue a bidirectional solution using two Vortex meters, ensure you have 40 diameters of pipe between them to dissipate the profile effects of the first shedder bar before encountering the second. Less diameters may be possible, but the results are completely process dependent and hence would require in-situ testing to determine feasibility and/or appropriate k-factor adjustments.
  • jefffos
    You can do the measurement with 2 elements facing outward. For a liquid flow, you can just bolt 2 units together, if you're using flanged units. You will get a reading from both units at all times, so you need to know which direction flow is going to know which meter is reading the flow, and which is reading noise in reverse flow. (The one with the higher reading should be the one that is correct, the one in reverse flow should read between 25-50% of the forward facing meter.)

    If you're measuring gas flow, there may be an accuracy issue using this method with the forward facing meter. Best guess is, if this impact exists, the impact would be 3% or less. However, data on gas flows with meters facing opposite directions does not currenlty exist.
  • jefffos

    In reply to jefffos:

    The above is for the 8800. We don't have data for the 8600 in this situation.
  • ATANU GHOSHAL

    In reply to Jared Drennen:

    Hi,
    We are planning to use Vortex flow meter for HP & LP Steam export/import line. As the same pipeline will be used for import & export of steam we need Bidirectional flow measurement. With orifice we are geting a huge variation of DP and the DP for minimum flow case is 80 mm H2O. In steam flow measurement using condensate pot arrangement there can be significant error in measurement with such Low DP. Hence we are considering vortex flow meter as the possible solution.
    I also want to know whether we can use the same equation given in EMERSON 8800 catalogue for calculating Permanent Pressure drop of gas flow applications for steam flow application as well.
  • jefffos

    In reply to ATANU GHOSHAL:

    Yes, the permanent pressure loss equation is the same for gas and steam.

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