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There is no more versatile machine in the mobile equipment marketplace than the skid-steer loader. And with typical yearly sales in excess of 60,000 units, it''s clear that these machines, seen by many as the Swiss Army knife of construction machines, have penetrated a wide range of applications.But not all of them, in part because of the very nature of the beast.A skid-steer loader, as the name indicates, maneuvers by "skidding"--slowing or stopping the wheels on one side of the machine, while keeping the other side rolling. This system, highly valued because of its simplicity and effectiveness, particularly in tight spaces, does have drawbacks in some applications. When operated in grassy areas, skidding the tires can scuff up the turf, a real nono in venues such as parks or golf courses. Even where ground disturbance is not an issue, tire wear, or even wearing of the surface on which the machine operates, can sometimes cause problems.

DERRICK: Pyramid, 160'' x 30'' x 30'', 1,044,000-1b hook load.BOP SYSTEM: One Shaffer 5,000 psi spherical,One single and one double Cameron U 13 5/8", 10,000 psi.CRANES: Three LeTourneau PCM 120''s w/100''booms. Rated for 48 t @ 26'' radius.REMARKS: Cantilever structure can be extended 40'' from stern.WORK AREA: Gulf of Mexico.OCEAN CRUSADERRIG DESIGN: JU-200 MCCONSTRUCTION: Bethlehem Shipbuilding, Singapore, 1982.PERFORMANCE: Water depth--200''; Drilling depth--20,000''.QUARTERS: 80 persons, plus 3-man sick bay.

The compressor uses capacitors to smooth ripples in the PC link in the motor drive. Instantaneously after a power failure, the motor becomes a "generator," using its angular momentum to create electricity (sometimes known as back EMF) and keeping the capacitors charged during the brief coastdown period. The capacitors, in turn, provide enough power to maintain levitation during coastdown, allowing the motor rotor to stop and delevitate. This feature allows the compressor to see a power outage as a normal shutdown.OIL-FREE DESIGNOil management, particularly as it pertains to the lubrication of compressor bearings, is a critical issue in refrigeration-system design. But with magnetic bearings, this issue is avoided. Only a very small amount of oil is required to lubricate other system components, such as seals and valves; often, however, experience shows that even this small amount of oil is not needed. Avoiding oil-management systems means avoiding the capital cost of oil pumps, sumps, heaters, coolers, and oil separators, as well as the labor and time required to perform oil-related services. Reports indicate that for many installations, compressor-maintenance costs have been cut by more than 50 percent.