Twelve years in offshore for Doris C. G

Journal Article · Thu Apr 12 04:00:00 EST 1979 · Pet. Inf. Ed. Int.; (United States)

OSTI ID:6310710

The offshore engineering operations of Doris have included the design of concrete and steel offshore structures, the design and construction of diving and underwater equipment, offshore equipment, vessels, and heavy mooring systems, and the design and installation of pipelines and risers. The company has also engaged in pipelaying, marine operations, diving, and inspection and maintenance work. Some achievements in 1978 were the completion, tow-out, and installation of the Ninian central platform and the design of an additional riser for the Frigg field manifold compression platform to connect the Piper field to the Frigg gas pipeline. The articulated gravity tower for concrete platforms was certified by Norsk Veritas in 1978, but fatigue tests on the articulating ball joint are continuing. New designs include the fixed gravity structure with removable floats, which makes the substructure much smaller, so that concrete platforms become economically feasible in water depths previously considered prohibitive, and the steel-and-concrete hybrid platform, which has been fully developed and certified as safe and economical.

• OSTI ID: 6310710
• Journal Information: Pet. Inf. Ed. Int.; (United States), Journal Name: Pet. Inf. Ed. Int.; (United States) Vol. 1498
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
423000* -- Engineering-- Marine Engineering-- (1980-)
BUILDERS
CONSTRUCTION
DESIGN
EQUIPMENT
FIELD PRODUCTION EQUIPMENT
MARINE RISERS
MOORINGS
OFFSHORE PLATFORMS
PERSONNEL
PIPES
UNDERWATER OPERATIONS