Pipe joints or couplings – Essential catch – With manipulator
Patent
1987-03-27
1987-11-24
Scanlan, Jr., Richard J.
Pipe joints or couplings
Essential catch
With manipulator
285320, 285 18, 285920, F16L 3718
Patent
active
047083760
ABSTRACT:
The collet-type connector (10) comprising an upper body member (20) having a plurality of collet segments (52), a cam ring (64) movable relative to the upper body member (20) to move said collet segments (52) into a detachable connection of the connector to a subsea wellhead (14, 14a). The cam ring (64) and collet segments (52) have sets of camming surfaces whereby a first set (86, 92) cooperate to pivot the collet segments (52) initially toward the wellhead (14, 14a) and whereby a second set (96, 104) serves to urge the collet segments (52) further to clamp the connector (10) to the subsea wellhead (14, 14a). When the second set (96, 104) of camming surfaces function, the first set (86, 92) no longer function to rotate the collet segments, thus reducing the power requirement for urging the collet segments (52) into clamping engagement to only one set at a time, even though both sets together serve to aid in holding the collet segments in clamping engagement with the wellhead after final engagement.
The connector is further characterized by the fact that, first, one set (86, 92) of camming surfaces serves to hold the collet segments (52) in a conical orientation to facilitate positioning the connector (10) over the wellhead (14, 14a) and, second, together with the complementary ledges (92, 94) to form a load path (arrow 122) between the collet segments (52) and the upper body member so that any load on the connector (10) as it is being placed in the wellhead (14, 14a) will be transferred to the upper body member. Further, the means for actuating the cam ring (64) are hydraulic cylinders (66) which are mounted for easy removal and replacement, if necessary.
REFERENCES:
patent: 3492027 (1970-01-01), Herring
patent: 4433859 (1984-02-01), Driver et al.
patent: 4496172 (1985-01-01), Walker
patent: 4557508 (1985-12-01), Walker
Christmas Tree Production-p. 1665 of Composite Catalog.
10,000 and 15,000 PSI WP Collet Connectors-p. 1642 of Composite Catalog.
McEvoy's "MD" Wellhead Connector: 183/4 10000 PSI and 15000 PSI-p. 5137 of Composite Catalog.
Jennings Charles E.
Thames Edward E.
Dwyer Joseph R.
Scanlan, Jr. Richard J.
Vetco Gray Inc.
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