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Bottom Pack-off Cross Over Seal |
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The standard bottom pack - off is type 'PBP1'
The bottom pack - off is installed in the lower flange of
the casing head spool and tubing head spool to
prevent the lower flange from being exposed to high
pressure.
The bottom pack-off type 'PBP1' seals the annulus
pressure by injecting packing. The bottom pack - off
PBP - 2 is designed to give a positive annular seal with
pressure energized oversize O - Rings.
For services at working pressures above 5,000 psi,
the 'PP' seal is used.
When the bottom pack - off is used, the casing should
be cut 90 mm from the top flange surface of the
connecting spool. |
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