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Danger comes from the fact that centrifugal force does not increase in direct proportion to an increase in speed, but instead it increases as the square standby of that speed increase. When rotational speed doubles, centrifugal force quadruples. This effect means that relatively generator small changes in speed can produce aynsley china pastel tea set significant increases in force. in the example mentioned, changing from 6,600 rpm to 7,700 rpm multiplies the speed by 1.167. however, the corresponding centrifugal force would multiply by a factor of 1.167 starting and standby x 1.167, or 1.36. to take a more extreme example, consider generator the same wheel lismore salad set with a maximum safe operating speed of 6,600 rpm run on a 5-inch right angle grinder at 10,000 starting rpm. this represents an over-speed of about 1.5 times the wheel''s designed speed. but the corresponding centrifugal force-and the corresponding rotational standby stress on the wheel-would be about 2.3 times as much as the maximum allowed.

drilling equipment: drawworks--one nat''l1320 generator ue; pumps--two nat''l 10-p-130 triplex;prime movers--five cat. d-399ta; rotarytable--nat''l 0-375.derrick: 147''; pyramid; 1,392,000 scottie hat scarf and glove set lb hook load.bop system: ciw 10,000 psi.cranes: starting two 33t.mooring: three x 5.44 t.work area: bohai gulf, china.bohai no. 5rig design: bohai oil corp. vht-904.construction: dalian shipyard, china, 1983.performance: water depth--40 m; drilling depth--6,000 m.quarters: 102.hull: 76 m x 34 m x 5.5 m.variable load: 1,500 t.heliport: 17.2 m x 18.5 m.