Installation of the Troll Phase I gravity base platform

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:423151

Andenaes, E; Skomedal, E; Lindseth, S

The Troll Phase 1 concrete Gravity Base Platform is located in 303 m of water in the Norwegian Trench some 80 kilometers northwest of Bergen. The platform will be a major gas supplier to the European market far into the next century. This paper describes the major aspects in the design, preparation and performance of the platform installation operation. The extreme height of the structure was a challenge for design and performance of the marine operations, particularly when passing a shallow area with minimum depth of 237m. The foundation soils at the Troll Field required skirt piles to recordbreaking 36 m depth in order to sustain the extreme North Sea weather conditions. The potential of intolerable horizontal soil pressure on the skirt walls from large soil displacements during penetration was the dominating aspects of the skirt penetration. Extensive engineering supplemented with model testing and planning were conducted in the development of systems and procedures for monitoring and manipulation of acting loads on the skirt walls. The success of the design, planning and performance of the operation is documented through comparison between observed and predicted performance of main operation parameters.

• OSTI ID: 423151
• Report Number(s): CONF-960525--
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
42 ENGINEERING
DESIGN
FOUNDATIONS
INSTALLATION
NATURAL GAS FIELDS
NORTH SEA
NORWAY
OFFSHORE PLATFORMS
SITE CHARACTERIZATION
SOIL MECHANICS