Ice Observation Program on the Semisubmersible Drilling Vessel SEDCO 708.
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Pagination or Media Count:
A semisubmersible drilling vessel SEDCO 708 was equipped with ice detectors and ice accretion measurement devices, and observations were conducted while it drilled an exploratory well on the North Aleutian Shelf. One significant storm occurred 3-8 January 1983, which resulted in light spray ice accretion, estimated at 30 tons and a maximum thickness of 5 in. on understructure diagonal trusses. Only minor icing less than 1 in. occurred on the windward main columns 30 ft diameter. Comparison with the 1979 Ocean Bounty icing event suggests that wind speed is the significant parameter influencing icing severity, and that light icing will occur at average speeds around 30 knots and heavy icing around 88 knots, with undefined severity within the range. Four ice-phobic coatings were exposed on test panels one was effective.