GPSA Horizontal Filter Separator
  • Vote Up0Vote Down leandro1423 May 2008
    Posts: 3
    According to several of my colleagues, the GPSA states as a general rule that horizontal filter separators with vane packs as second stage of separation should be designed using 1/3 (one third) of maximum possible flow rate. Is it true? Which is the reason for this criteria?
    Thanks in advance.
  • 3 Comments sorted by
  • Vote Up0Vote Down Chief Wigam May 2008
    Posts: 3
    I don't think so, for the sizing of vane pack in the 2nd stage separation, we still need to use full flow rate as design criteria; velocity through the vane is very important. If the full flow rate passes through our 1/3 flow designed vanes, the velocity will be too high to meet the separation performance.
  • Vote Up0Vote Down Richard May 2008
    Posts: 1
    I know 1/3 is also used as a turndown ratio for demisters. When it's lower, its efficiency decreases.
  • Vote Up0Vote Down Mahmood May 2008
    Posts: 4
    I have not heard this before and can't find a statement to this effect in the GPSA data book. Sizing of filter-separators and coalescing filters is done by the equipment manufacturer using proprietary methods. The details around the sizing of this equipment are typically not published.

    In a filter-sep with a vane-pack used for the final stage of separation, the face area required for the vane pack could be estimated using the Souders-Brown equation with the appropriate Ks value. The Ks value to use would depend on the specific design of the vane pack, eg. simple vane vs high performance pocketed vane.

    Regards

    Mark Bothamley
    Chief Engineer


Add a Comment