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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

Safety moment

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.

Jacket fabrication

Bilder

Load-out

Bilder

Load-out

Bilder

Transportation

Bilder

16/10/2014 © Kvaerner 2011 16

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: crane lift

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

Topside

Bilder av Loadout og floatover Skidding or trailers

Topside

Floatover

Topside

Bilde av Dry tow-out

GBS

Bilder at GBS utslep og installasjon

Jack- up

Jack-up footings

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

Types of floaters

Installation of mooring system

Bilder mooring inst

Tow-out and installation of floater

Bilder

Mooring hook-up

Skisser