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A Tale of an Azimuthing Thruster
We have often wondered whether it was really worthwhile to install
drop down thrusters in offshore support vessels. When they were
first developed it seems to us that at some stage some-one would leave one
in the extended position when coming into port and that it would get
knocked off or at least bent horizontal. It would then be necessary to put
the ship into drydock to put it back. There would be no way, we thought,
that the Master or his team could absolutely guarantee to have the thing
safely housed when the ship entered shallow water and sure enough this has
turned out to be true.
We would still question the value of
these things, or more correctly, whether their advantage as
omni-directional thrusters over tunnel thrusters, or indeed the vane
thrusters which do not stick out from the bottom, exceeds the disadvantage
of extreme vulnerability. Are they no more than a sexy accessory?
Well, you've probably guessed by now that
yet another ship-master deserves our sympathy. It is rumoured that the
Gulf Offshore UT755 Highland Drummer lost its azimuthing thruster in the
entrance to Aberdeen harbour at the beginning of the month, and
temporarily caused a depth restriction until it had been recovered. We are
told that it had been housed on departure from the field, but that on the
way in it had eased itself down into the operational position without
anyone noticing.
It is probable that the Master went
though his checks before entering port and asked his team whether the
thing was housed. Who-ever had pressed the button on departure from the
offshore location would obviously answer yes, without actually checking
the thing. Those of us who are involved in risk assessment techniques
would probably ask what the barriers in place might be to prevent this
misfortune. If we were told that there was only a single barrier which
consisted of a mental check list used before entering port, we would give
the barrier a very low level of credibility, and would require further
barriers to be put in place. It is not too difficult to think what
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More Ferry News We
reported last month that
the ferry service to the Faeroes was not be filled by the St Clair, but by the
Clare, quite a different vessel.
During the early part of November the
North East of Scotland was beset by storms of great severity which flooded
the Moray coast towns and prevented the island ferries from sailing out of
Aberdeen. Large numbers of anchor-handlers were available on the spot
market but unsurprisingly were not hired, since they could not get out of
the port.
Meanwhile the said "Clare"
broke down somewhere to the North of the Scottish mainland, briefly
causing alarm on every platform in the Shetland Basin since for some
reason they feel more threatened by drifting vessels than by those under
power. This despite that fact that no drifting vessels have actually run
into oil rigs. Fortunately for their peace of mind the Balder Viking was
on its way back from the Hutton TLP tow job (see competition entries for
more of this), and was hired by the owners to tow the Clare to a port of
refuge, which was Invergordon. The Clare was finally tied up at the
Invergordon aluminium berth. Below is a newsworthy photograph of the final
moments of the tow, as the Balder Viking and the Clare approached the
berth.

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The Stena Dee to Depart Invergordon The
Seabrokers monthly newsletter which goes from strength to strength in terms
of both presentation and content announced this month that The Repsol
charter is to be filled by the semi-submersible Stena Dee, and that it is to
be towed from the Cromarty Firth to the location off Cadiz by the venerable
UT708 Aldoma. We will be watching
this transit with interest since a towmaster of our acquaintance took a semi
on the same route a couple of years ago at this time of year, although the
towing vessel was almost new and was over 18,000 BHP. For several days the
rig and tow made no progress against heavy seas in the Bay of Biscay, and
they finally began to move ahead when the windspeed fell to around 45 knots.
"Weather improving" he emailed "its down to a force nine
which is a relief." We
can only wish the crews on the Stena Dee and on the Aldoma the best of luck
and suggest that no-one whistles.
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The Asco Take-over Further
to our previous report that Asco were to operate for BP out of Aberdeen, it
has been announced that they have also ousted Seaforth as logistics provider
for the Shell base at Torry Dock. However in both cases it seems that the
Operators are to source their own vessels, which are in the case of the BP
operation, a fleet of Maersk platform ships.
Seaforth are to retreat to their original
area of operations at Waterloo Quay from where they will provide services to
a number of clients. But by now it must be becoming obvious that we are not
following this too closely, probably because the whole process seems to have
been more or less kept under wraps.
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Anchor-handlers and A-Frames These
stories seem to be self perpetuating. Having reported last month that the
heavy duty fleet was being fitted with A frames to facilitate the
installation of subsea completions we are able to report this month that
several of them are having their A-frames removed so that they will be
better able to carry out anchor jobs. This
must mean that we were quite wrong to suggest that A-frames do not get in
the way of anchor work.
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The Drillships and the Deeps There
are rumours in Aberdeen that Agip have chartered the Dolphin drill ship to
drill a well in 1000 metres of water west of the Uk some time in 2003. This
vessel which we thought was called the Navis Explorer is now apparently
called "Belford Dolphin, which we though was Navis Explorer. The
Fred Olsen rigs are very confusingly named, all beginning with the letter B
and ending with the word Dolphin. Hence the Borgny, Bulford, Byford and
Borgsten all sound pretty much the same, and now Belford has joined them.
Come to think of it last time we came across this particular name your
scribe was the mate of an anchor handler towing the Aker H3 Belford Dolphin
out of the construction yard at Oslo towards the Thistle Field, where the
rig was to be used as an accommodation unit. And
the West Navion is shortly to be hired by BP for some lesser work west of
Shetland. Has the day of the drill ship arrived for the UK sector?
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