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FS Seals

Similar in form and function to a rod orientation Spring Seal, the FS seal is a double acting static seal designed for use as casing and tubing hanger seals in wellheads. FS seals are designed for use against rough casing, with wide dimensional and geometrical tolerances and variable surface finishes, which can result in large clearance between the mating parts of the wellhead.

An FS seal typically has a larger cross section than a Spring Seal to increase the sealing force on the casing while the recess in the seal back controls the radial compression on the seal by allowing it to deflect when in contact with a larger or out-of-round casing section.

The FS seal is made up of an elastomeric sealing element with molded-in springs to act as anti-extrusion elements. The springs used are open coil and manufactured with no initial tension so that the coils are free to open to allow for rubber penetration during molding. The same mechanism allows the spring to respond to pressure fluctuations during operation to close clearances in the metalwork and ensure extrusion of the elastomer is prevented. Due to the potential for larger clearances in the wellhead, the FS seal springs are of a larger diameter than a corresponding Spring Seal.

  • Materials

    FS-Seals are available in the following elastomer families:

    • FKM - EnDura®
    • HNBR - EnDura®
    • NBR

     

    And the following spring materials:

    • Stainless Steel 302
    • Inconel Alloy 600

     

    All combinations of the above elastomers and springs are available.

  • Geometry Detail

    Outside Diameter (A) of FS Seal

  • Standard sizes
    Nominal Casing SizeHousing BoreHousing Depth
    InchmmInchmm
    2.875”4.063103.190.83521.21
    3.500”4.688119.060.83521.21
    4.000”5.250133.350.83521.21
    4.500”5.750146.050.83521.21
    4.750”6.000152.400.83521.21
    5.000”6.250158.750.83521.21
    5.500”6.750171.450.83521.21
    5.750”7.000177.800.83521.21
    6.000”7.250184.150.83521.21
    6.625”7.875200.030.83521.21
    7.000”8.250209.550.83521.21
    7.625”8.875225.430.83521.21
    7.750”9.000228.600.83521.21
    8.625”9.875250.830.83521.21
    9.000”10.250260.350.83521.21
    9.625”10.875276.230.83521.21
    9.875”11.125282.580.83521.21
    10.750”12.000304.801.00025.4
    11.750”13.125333.381.00025.4
    11.875”13.250336.561.00025.4
    13.375”14.750381.001.00025.4
    13.625”15.000381.001.00025.4
    14.000”15.375390.531.00025.4
    16.000”17.375441.331.00025.4
    18.625”20.000508.001.00025.4
    20.000”22.063560.391.56339.69
    24.000”26.063662.001.56339.69
    * 30.000”32.063814.101.56339.69
    * 36.000”38.063966.801.56339.69

    * Larger sizes on a project by project basis

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