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Each machine is hydraulically driven with the hydraulic motors powered by

a power pack, located in a non-hazardous area.

The drives for the hose reel and hawser storage drum are controlled from a

panel mounted between the two units, as is the spooling mechanism for the hawser

storage.

Safety features in the export system include a breakaway coupling in the

hose string that is designed to close automatically should hose tensions become

excessive. A self closing coupling at the outboard end of the hose also closes when

disconnected from the shuttle tanker.

Load sensing devices are incorporated to measure the tension in the hose and

hawser line, and are continuously monitored during the offloading operation, with

signals being fed into alarm and cargo offloading pump shut-down systems.

6.2 SEMI-SUBMERSIBLE PLATFORMS AND TENSION LEG

PLATFORMS
In addition to the mono hull, three floating structure designs ─

Semisubmersible (Semi), Truss Spar and Tension leg Platform (TLP), ─ have been
successfully developed for use as floating production systems (FPS) over the past

several decades. Each of these floater designs has evolved along with subsea and

riser technology to meet new field development challenges related to increased

water depth, drilling, and reservoir operating pressures and temperatures. Design

improvements continue to be made as new developments in deepwater technology

are incorporated into the basic designs.

The functional requirements for floating structures can be generalized as:

Drilling facilities

o Number, type and location of drilling rig

Production facilities

o Weight, area and center of gravity

Drilling / production risers
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