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The first rescue trucks in the early 1970s typically were built on a light-duty cab chassis with two-wheel drive and gasoline engines because rescue tools and equipment were simple: chains, come-alongs and hand-powered tools. But they evolved to small, lightweight, low-duty cycle vehicles to carry equipment to aid or support an emergency incident. Rescue trucks fall under the "Special Service Fire Apparatus" portion of the standard. A minimum of 120 cubic feet of enclosed compartmentation is needed to meet the requirements. This should be an easy requirement to meet, as even the smallest bodies should have at least double the amount of this requirement. Also, there are some minor equipment requirements that will need to be considered, such as one SCBA for each seated position, but not fewer than two total, and one spare air cylinder for each breathing apparatus carried.
[FIGURE 1-2 OMITTED]When the magnetic bearings are energized, the motor and impellers, which are keyed directly to the magnetic shaft, levitate. Permanent-magnetic bearings do the primary work, while digitally controlled electromagnets provide the fine positioning. Four positioning signals per bearing hold the levitated assembly to a tolerance of 0.00002 in. As the levitated assembly moves from the center point, the electromagnets'' intensity is adjusted to correct the position. These adjustments occur 6 million times a minute. The software has been designed to automatically compensate for any out-of-balance condition in the levitated assembly.SHUTDOWNS AND POWER FAILURESWhen the compressor is not running, the shaft assembly rests on graphite-lined, radially located touchdown bearings. The magnetic bearings normally position the rotor in the proper location, preventing contact between the rotor and other metallic surfaces. If the magnetic bearings fail, the touchdown bearings (also known as backup bearings) are used to prevent a compressor failure.
"In just 10 years, the number of chip mills in the region has more than tripled--to at least 150--each devouring an average of 10,000 acres of forest a year," says Danna Smith, executive director of the Dogwood Alliance, a consortium of environmental groups opposing chip mill operations. And with each American using up 688 pounds of paper a year (the Chinese consume just three), chip mills are not only profiting, they''re expanding.
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