AN INTRODUCTION TO AN INTRODUCTION TO VERY LARGE FLOATING VERY LARGE FLOATING

STRUCTURESSTRUCTURES

INTRODUCTIONINTRODUCTION

TYPES OF VLFSTYPES OF VLFS

Semi submersible typePontoon type

MEGA FLOATS MEGA FLOATS ADVANTAGESADVANTAGES

Environmental friendlyEasy and fast to constructEasily removed or expandedProtected from seismic shocksNo differential settlement

DESIGN LOADSDESIGN LOADS

Dead load Hydrostatic pressure Live load Abnormal loads Earth pressure Effects of earthquakes Effects of temperature change

Effects of water current Effects of tidal change Effects of seabed movement Effects of movements of bearings Snow load Effects of tsunamis Effects of storm surges, ship waves, seaquake, brake

load, erection load Effects of drift ice and ice pressure Effects of drifting bodies Effects of marine growths

DESIGN CONSIDERATIONSDESIGN CONSIDERATIONS

MaterialsConfigurationsDesign criteriaCorrosion protection

RATES OF CORROSIONRATES OF CORROSION

Corrosive Environment Corrosion Rate (mm/year)

Offshore side

Above HWL 0.3

HWL to- 1 m below LWL

0.1 - 0.3

1 m below LWL to seabed

0.1 – 0.2

Mud layer beneath seabed

0.03

Onshore side

Air 0.1

Earth above water level

0.03

Earth below water level

0.02

MOORING SYSTEMMOORING SYSTEM

UNIQUENESS OF VLFSUNIQUENESS OF VLFS

Large sizeEnvironment conditionDesign and analysisConnection at seaDesign life and other unique criteria

CONCLUSIONCONCLUSION

Thank YouThank You