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chain, main hawser and offloading hose from the FPSO to the
shuttle. Alternatively, the hawser and offloading hose can be
deployed prior to arrival of the shuttle tanker such that the shuttle
can collect the messenger line and then haul in the hawser with the
hose already attached to the chafe chain via a connecting wire.
The offloading hose is made-up of 10 meter lengths, joined
so that any length can be easy replaced.

Figure 4.9 – Stern offloading reel (Aker Kvaerner)
The inboard end of the hawser is attached to a bracket that
forms an integral part of the drum, which is mounted on the aft
deck next to the hose reel. This drum stores the main hawser in
one layer, the chafe chain and the messenger line.
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.

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