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The new 16 lip, CV460 engine features a compression ratio of 8.2:1 and produces 26.8 lb.ft. of torque at 2400 rpm. The 17 hp, CV490 engine, with a compression ratio of 8.4:1 has a alableddiagramofaelectricdrill maximum torque of 27.7 lb.ft. at 2400 rpm.Another single-cylinder engine announcement from Kohler included the addition of an 8.5 lip model to its Command Pro CS 8.5 lip horizontal shaft series. "At 250 cc, the Kolher Command PRO CS 8.5 complements our existing small-frame models at 4 and 6 lip and large frame models at 10 and 12 lip," said Blum.

This article describes this new compressor technology and its first use in an ARI-certified chiller design.THE BEARINGSTraditional centrifugal compressors use roller bearings and hydrodynamic bearings, both of which consume power and require oil and a lubrication system. Recently, ceramic roller bearings, which avoid issues related to oil and alableddiagramofaelectricdrill reduce power consumption, were introduced to the HVAC industry. The lubrication of these bearings is provided by the refrigerant itself. (1)Magnetic-bearing technology is significantly different. A digitally controlled magnetic-bearing system, consisting of both permanent magnets and electromagnets, replaces conventional lubricated bearings. The frictionless compressor shaft is the compressor''s only moving component. It rotates on a levitated magnetic cushion (Figure 1). Magnetic bearings--two radial and one axial--hold the shaft in position (Figure 2).

This year''s listing contains 362 jackup units, including existing rigs and announced newbuildings, a decrease of two from last year. The listing excludes: shallow-water units working in inland waters, several rigs of the Former Soviet Union fleet, and those in non-drilling modes. The loss of two rigs results from the deletion of two listings. No additional newbuildings were added.Low crude prices continued to cut offshore operators'' drilling budgets in 1999, as reflected by reduced utilization and dayrates that continued the low levels of late 1998. The U.S. Gulf of Mexico saw rate cuts approaching 50% of early-1998 levels, as did Africa and and Asia. alableddiagramofaelectricdrill Even the North Sea saw cuts of more than 20%.