Hydraulic holddown screw with mechanical retention means

Pipe joints or couplings – Packed – With separable follower

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Details

285351, 285145, 285146, 285920, F16L 1900

Patent

active

046502254

ABSTRACT:
A holddown screw assembly 10 which features a shaft 33, an energizer screw 39 and a detachable contact nose 20 adapted to be assembled in coaxial alignment in a radial bore in a wellhead structure. The shaft is provided with a passage 40 extending from its outer end as the holddown screw is normally used in a wellhead installation to a cross passage 41 at the other end of the shaft. Also, at its outer end, a fitting 32 is attached to facilitate connection to a hydraulic supply line 28. An annular bearing flange 35 is provided on the shaft near its outer end. A packing nut 31 and a set of packing rings 34 are sleeved about the shaft 33 with the nut disposed in abutting relation to the bearing flange 35 where it is held fixed but rotatable thereagainst by means 36. The packing nut is threaded into a threaded section of a bore 11 such as may be provided in the flange 12 of a casing spool 13. By turning the packing nut, the packing ring set may be compressed against a shoulder 37 in the bore 11. The energizer screw is also threaded into a threaded section of the bore 11 and is provided with passage means 44 extending in the axial direction therethrough. The contact nose 20 is attached to the energizer screw 39 in a manner which premits a limited axial movement of the contact nose relative to the shaft 33. Accordingly, hydraulic pressure communicated to the outer end of the holddown screw 10 will be communicated through the shaft 33 and energizer screw 39 to be applied against the contact nose 20 to drive it against the object to be held down or seal assembly 14 to be energized. By communication of hydraulic pressure to a plurality of such screws, the screws 10 may be energized simultaneously. For each holddown screw 10 a mechanical connection is provided between the shaft 33 and energizer screw 39 whereby axial rotation of the shaft 33 will effect the threaded advancement of the energizer screw to drive the contact nose and thereby effect a mechanical actuation of the holddown screw. This capability is available as an alternative to hydraulic means of energizing the holddown screw 10 and also as a means for mechanically retaining the preload after it has been applied hydraulically.

REFERENCES:
patent: 3017931 (1962-01-01), Jackson et al.
patent: 3334924 (1967-08-01), Todd

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