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A typical stern mounted offloading reel system is shown (fig. 6.7). The reel

typically stores approximately 110 meters of 16 inch diameter bore flexible

offloading hose string. The reel stores the hose between offloadings. Transfer rates

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are approximately 4000 m /hour (600,000 bbls in 24 hours) from the FPSO to a
shuttle tanker moored approximately 80 meters astern.

The offloading reel is driven by multiple hydraulic motors which allows for

satisfactory operation of the system even with one motor out of action.

Connection between the vessels is made without the need to transfer

personnel or use of a support vessel.

This can be achieved via two methods, either by firing a line to the shuttle

tanker and transferring the messenger line, chafe 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 6.7 – 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.

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