An elastomeric clutch can be used to precisely control the break-out torque. Filed: August 13, Date of Patent: September 14, Inventors: Edward J. Load and deflection measurement system for elastomeric bearings.
Abstract: Force transducers are integrated in an elastomeric flex bearing to provide signals for determining the tension and torque upon a tension member coupled to the bearing and for computation of the azimuth and elevation of the tension member. Preferably the force transducers are mounted to or embedded in an outer metal load ring of the flex bearing and are bonded with the outer metal load ring to the elastomer of the flex bearing. The force transducer, for example, include a diaphragm bonded to the elastomer, and the diaphragm has a diameter in excess of the spacing between the outer metal load ring and the nearest laminated metal reinforcement of the bearing.
In one embodiment, metal foil strain gages are bonded to the surface of the diaphragm opposite from the elastomer. In another embodiment, the diaphragm transmits pressure to hydraulic fluid between the diaphragm and the outer metal support ring.
Filed: June 4, Date of Patent: May 18, Inventors: Charles J. Moses, Michael E. Tension adjustment mechanism employing stepped or serrated ramps for adjusting tension of a tendon from a floating marine platform.
Abstract: Vertical movement of a floating marine platform is reduced by tendons extending from the platform to anchors on the seabed. A final tension adjustment to equalize the load on all of the tendons is made by a respective tension adjustment mechanism incorporated into the top connector of each tendon. The tension adjustment mechanism includes a split load ring assembly having an upper ring and a lower ring.
The upper ring and the lower ring abut each other at respective complementary surfaces. Each surface has a series of serrated ramps. A rotation of one ring with respect to the other causes the upper ring to climb over the lower ring to thereby increase the tension in the tendon.
Rotation of the upper ring with respect to the lower ring, for example, is achieved by a motor driven gear ring. Filed: December 23, Date of Patent: February 23, Inventor: Charles J. Riser tensioner system for use on offshore platforms using elastomeric pads or helical metal compression springs. Abstract: A riser tensioner system 10 is provided for use on offshore oil drilling platforms to support a riser 12 relative to a floating platform.
The riser tensioner system 10 uses either elastomeric pads 32 or helical metal springs as an energy absorbing medium, rather than hydraulic, or pneumatic systems. The elastomeric pads 32 or helical metal springs are maintained in compression within a shock absorber housing 76 by a plunger 70 which is compressed by the weight of the riser If the riser tensioner system 10 is arranged to place the shock absorber 20 in tension, the shock absorber plunger 70 is inverted in the housing 76 to maintain the elastomeric pads 32 or helical metal springs in compression.
To achieve varied response characteristics, nested inner and outer elastomeric pads 50, 52 or compression springs , are arranged to act together. Filed: October 12, Date of Patent: August 19, Arlt, Charles J. Variable spring rate compression element and riser tensioner system using the same.
Abstract: A compression element having a deflectable elastomeric member is disclosed. The compression element exhibits a decreasing axial spring rate in response to axial movement and compression of the deflectable member.
The compression element may be used alone or in combination with other compression elements in riser tensioner systems to maintain a substantially constant upward tensioning force on a riser as it moves axially relative to a floating platform.
Filed: April 4, Date of Patent: June 24, Inventor: Edward J. Arlt, III. Elastomeric riser tensioner system. Abstract: A riser tensioner system for applying a substantially constant tensioning force to a riser and allowing a floating platform to move within a given range along a longitudinal axis of the riser.
The system includes a plurality of tensioner assemblies each of which are coupled to the riser and to the platform. Each of the tensioner assemblies includes an upper member, a lower member, a connecting member coupled to the upper and lower members, and intermediate members coupled to the upper and lower members at a point intermediate the ends of the upper and lower members.
At least one of the upper member, the lower member, and the intermediate members are adapted to provide a constant tensioning force. The arrangement of the upper member, lower member, connecting member, and intermediate members further provide a linkage whose centerline in angularly spaced from the longitudinal axis of the riser by a substantially constant amount throughout the range of motion of the linkage. Filed: June 23, Date of Patent: May 13, The riser system comprises a first rigid pipe section coupled at its upper end to the platform.
A plurality of intermediate pipe sections are mutually coupled end to end, and are coupled in series with the first rigid pipe section by means of a plurality of flexible couplings. The lower end of the last in the series of intermediate pipe sections is coupled to the subsea location. Filed: September 7, Date of Patent: April 1, Namespaces File Discussion.
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