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Major overseas suppliers for the small, compact machines include Kubota from Japan and Ingersoll-Rand, which acquired SuperStay in the Czech Republic two years ago. Ingersoll--Rand now imports the SuperStay machines (sold previously under the EarthForce America brand name) and sells the machines under its own name as well as the Bobcat brand. In 2002, 1R and Bobcat accounted for about 9 percent of the small backhoe market -- that in the first year of marketing. In 2003, Ingersoll-Rand and Bobcat will very likely start taking share away from the leaders, which will alter the makeup of the market within 12 to 18 months. Going back to the standard backhoes, it is interesting to note that Case, Deere and Caterpillar (in that order) are still the major stakeholders in North America. New Holland also has a strong market position. These four companies accounted for over 85 percent market share in 2002, down a trifle from years past. Terex became a more active player in the marketplace in 2002, jumping from a 2 percent market position in 2001 to a 5 percent participant in 2002. Terex used a very aggressive pricing scheme to gain market share during the year, which apparently worked successfully. I believe the Terex product line, which is well-engineered, is going to be better known in the future. The dispatcher activates emergency traffic tones, then announces a collapse where firefighters have been trapped. Command adjusts tactics from suppression to rescue, placing attack lines or elevated streams in the collapse area to protect trapped firefighters from the advancing fire.Prompt rescue of firefighters lost or down in burning buildings is critical. There''s an extremely narrow window of survivability for firefighters out of SCBA air supply or trapped by approaching fire. Normally, rescuers attempt to determine the last known location of the lost firefighters by tracing hose lines, then looking for arms and legs, listening for shouts, taping noises, breathing, moans, radio broadcasts, audible tones from PASS devices, or the sounding of SCBA bells. 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 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). ©2003 www.autoheaters.net All rights reserved. |
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