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MEK 4450 Marine operations. 1-1 Kværner ASA, June 2014
About ourselves
Helge Johnsgard PhD applied Mathematics, UiO Kværner Jacket technology
Elisabeth Gjølmesli Master of Science, Boulder, Colorado & UiO DNV Riser Section
Summary of the course
Brief introduction to marine operations Examples taken from three fields Brief description of project challenges
Some simple analytical models Brief introduction to main numerical tools
Summary of the course WEEK 1 WEEK 2
1. Lecture Platform installation Excersize
2. Lecture Laying of flexible pipes and cables
Hydrostatic model Frequency domain hydrodynamic Time domain analyses
3. Lecture Subsea module lifting
Introduction to marine operations and project engineering
Various Types of Platforms
Floating or bottom fixed Living quarters, storage, drilling, processing etc Foundation + topside
General
Production Prepared for transport
Load out, dry tow Transferred to floating condition, wet tow
Tow to field Design of towing fleet
Installation Transfer to “installation mode” Positioning (horizontal and vertical)
Installation of topside Hook-up to mooring, set- down on sea floor etc.
Some challenges during launch and upending
Position and size of temporary buoyancy tanks Maximum forces at rocker beam Maximum depth during launch
Structural loads due to hydrostatic pressure Bottom clearance
Floating condition after launch Access to lifting arrangement
Upending Structural loads Crane load Bottom clearances
Proper upright position Ballasting of side legs
Jacket installation,- final phases Jacket in upright position?
Ballast in jacket legs Transit to set-down point. Several 100 meters Further ballasting and lowering by crane Landing Release crane On- bottom stability in temporary phase? Piling
TLP
Platform with buoyant sub-structur Vertical strong and stiff mooring, high pretension Vertical motion arrested Large horizontal motions
TLP installation
Lowering and piling of fundaments Tendon installation Tow-out of platform Hook-up and pretensioning