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Yatsu said, however, the ministry will first conduct research for up to two years to assess what impact the opening of the gates would have on the sea before opening them.''''We cannot open the gates immediately because the panel has recommended that we conduct research while keeping the gates closed,'''' Yatsu said.But the opening of the gates ''''will become necessary during the two-year period during which we will conduct research on the Ariake Sea,'''' he said.When the gates can be opened ''''remains unknown because the timing depends on the findings of the research,'''' he said.The panel, headed by University of Tokyo professor emeritus Makoto Shimizu, has been looking into the cause of this season''s poor seaweed crop in the inland sea in Nagasaki Prefecture. I don''t know anything else nonexplosive, that you can pick up with one hand, and that can move five tons one hundred feet--with safety, precision, and astonishingly little work. Like many good tools the Tirfor is a thing of beauty, superbly designed and engineered. With 100 feet of cable (or more) its reach is much greater than a come-along, and this can often make all the difference. Its speed is much faster, too, not just the speed in moving something (the lever is double-acting) but speed in setting up or moving the set-up around. Often when you need to move something, minutes if not seconds count. The action is precise. A come-along winds the cable upon itself, and often when the cable comes under tension the cable wrap slips a bit. The resulting jerks can cause all kinds of problems in a situation where precise movement counts, and a sudden shift in load may cause failure somewhere else. Finally, the Tirfor has a much more effective (and safer) mechanism for smoothly lowering a heavy load. Most (ratcheted) come-alongs are very poor at this. One potential source of serious injury in grinding comes from an oversight that is easy to make: operating the wheel in an over-speed condition. While a wheel that is run far enough in excess of its rated maximum speed may shatter within minutes of operation, danger may also result from a wheel run just slightly faster than its rated speed. This less severe over-speed condition can cause the wheel to be damaged, and the damage may result in breakage after further use. For example, operating a reinforced, 9-inch diameter, Type 27 wheel rated for a maximum speed of 6,600 rpm on a 7-inch angle grinder with a speed of 7,700 rpm can cause the wheel to crack. This cracking can lead to breakage later. Any of these actions sets up a disastrous scenario that could lead to an accident involving serious injury or death. ©2003 www.concrete-saw.net. All rights reserved. |
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