Page 116 - Damen Shipyards Group

116 REPAIR & CONVERSION | TARMAC MARINE’S AGGREGATE DREDGERS
In the world of dredging, there
are few sectors as challenging as
aggregates. While sand is highly
abrasive, gravel is even more of a
challenge, being dense, irregular
in shape and unforgiving when it
comes into contact with decks, hulls
and equipment. Bringing it up from
the seabed, depositing it in the
hold and then off-loading it once
back at the terminal takes a toll on a
vessel, yet they can ill-afford time off
work. Aggregates are a low-margin
product, and the dredgers that do
it need to work almost constantly to
make a return.
“The City of London and the City of
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Keeping the show on the road meant that Tarmac had to source its repair their quoted timescale for a project. “We
works closer to home but, in August 2018,
DREDGING FOR Given the work they do, the ships take the City of London returned to DSAm. considered sending the City of Westminster
to DSAm as well,” he continued, “but
quite a battering with both the equipment
and the vessels themselves having a very There she underwent a wide range of unfortunately they didn’t have any capacity
high wear rate. A lot of repairs are required repairs. As well as general steel works, her for our particular window, and we wouldn’t
dredging equipment had new seals, piper
year-on-year, mainly to the cargo housing
use another Damen yard at short notice as
AGGREGATES equipment, but also elsewhere. With the elbows, screening towers, a new discharge we have an in-house safety audit process
that we have to undertake for partner yards
bucket and wear plates, along with many
ships needing to be operational almost more minor repairs and servicing. and there simply wasn’t time. However, we
continuously it is essential that the repairs
not only take up as little time as possible, hope to send her and the others there in
A TOUGH BUSINESS but also that they be of the highest quality “It was a very quick turnaround, just nine the future, as long as the numbers add up.
For the City of Cardiff, it is a long trip to
days! We normally allow two weeks for
so as to avoid any unplanned downtime.
these annual overhauls, so this was a great make, but in the past the whole fleet used
Tarmac Marine is a subsidiary of Tarmac, “The City of Chichester and the City of “Tarmac has had a relationship with Damen result. We are always very confident with to dock in Amsterdam, so it could happen
Damen Shiprepair Amsterdam and once
the UK’s largest supplier of building Cardiff are very similar to each other Shiprepair Amsterdam (DSAm) that again they delivered on Damen’s philosophy again. We know that we can always rely on
stretches back 20 years or more,” continues
DSAm for workmanship, safety and fast
materials with a history that dates back
over 150 years. With over 120 quarries in in size and design. 72 metres by 15 Keith. “In recent times, currency factors of always doing their best to keep to delivery times.”
metres, they can each carry 1,418m³ of
its portfolio producing every conceivable material and were built in 1997. The City
type of aggregate it is not surprising that, of Chichester operates in the English
even within the company, not everyone Channel, serving the south coast of
England, while the City of Cardiff extracts
is aware that it also operates four trailing
suction hopper dredgers. sand on the UK west coast and delivers it
to wharves in the Bristol Channel and in
the North West.
Westminster are sister ships,” explains
Keith Marshman, Marine Fleet Manager All the gravel is used mainly in the
for Tarmac. “They were delivered in 1989 production of concrete and over 90% of
and 1990 respectively. 100 metres in the total aggregate that the four vessels
length and with a deadweight tonnage of together extract each year is used
5,989 they are capable of dredging down internally within the group.
to 40 metres. They operate in the North
Sea off the coast of England and land
their cargoes within Tarmac’s network of
Thames wharves to supply London and its
surrounding region