"Fuel filters on the tractors are removing 90% of these particles, but in Texas there are nearly 3 million in the 2- to 5-micron size compared to about 100,000 in Iowa. Even with only 10% of the particles getting by, there are still plenty of contaminants drillpressandpicture to cause problems," he says.Clampitt''s study shows that drier conditions in Texas contribute to more dust in storage tanks. However, he says he''s found more problems with the portable tanks used to transfer fuel to the field."Most farmers with injector problems use pickup tanks or tanks mounted on trailers drillpressandpicture to take fuel to the field. The fuel in these tanks is usually agitated, so contaminants are in suspension. The tanks often don''t have a filter because the operator doesn''t want to slow fueling capacity. They often don''t have a proper vent cap and the fuel nozzle isn''t shielded from road dust," he says. Petroleum storage is the greatest environmental risk on most farms

OTHER DATA: Typical of Bohai No. 5.WORK AREA: Bohai Gulf, China.BOHAI drillpressandpicture NO. 9RIG DESIGN: Bohai Oil Design Co., VHT 905.CONSTRUCTION: Dalian Shipyard, 1984.OTHER drillpressandpicture DATA: Same as Bohai No. 7.BOHAI NO. 6RIG DESIGN: Jack-upCONSTRUCTION: Bethleham Shipyard, Singapore, 1979.PERFORMANCE: Water depth--76 m; Drilling depth--6,000 m.QUARTERS: 93 persons.HULL: 50.6 m x 33.2 m x 4.9 m.VARIABLE LOAD: 1,837 t.HELIPORT: 18.29 m x 33.22 m x 4.88 m.STORAGE: Mud & Cmt Bulk--170 cu m; LiquidMud--238.2 cu m; Fuel--263.4 cu m; Water for

One fundamental limitation of GPS is that receivers require an unobstructed view of the sky, so they only can be used outdoors. Even then, they often don''t operate well within forested areas or near tall buildings. GPS operations also depend on an accurate time reference, which is provided by atomic clocks at the U.S. drillpressandpicture Naval Observatory. Each GPS satellite has atomic clocks on board.Thus, each GPS satellite transmits data indicating its present location and the current time. All GPS satellites synchronize operations so that these repeating signals are transmitted at the same instant. The signals, moving at the speed of light, arrive at a GPS receiver on the ground at slightly different times because some satellites are farther away than others.

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