Marine News Boat of the Month: February 2017

Image: Damen

Marine News

Damen's All New Marine Aggregate

Damen Shipyards Group recently unveiled a new line of Trailing
Suction Hopper Dredgers (TSHD). The new product range, comprising
of the Marine Aggregate Dredger (MAD) 4000 and 5600 vessels, was
introduced in response to extensive market research and customer
consultation. The MAD vessels are potentially important to an
aggregate industry that, today, faces rising demand and an aging
fleet. Designed in collaboration with Maritime Design and
Engineering Services (MD&ES), the MAD 4000 and 5600 are
welcome additions to Damen's Trailing Suction Hopper Dredging
portfolio. For offshore aggregate operations, the new vessels
will be able to work in North Sea conditions up to depths of -60
meters. These capabilities allow operators to mine sand and
gravel in deeper waters, farther from shore than preceding

Damen invested considerably in research and development for the
new MAD vessels, having observed an increase in demand for civil
construction supplies deriving from an overall improving economy.
The development aims at offering industry advanced technology,
well suited to existing ports and delivering more uptime at sea.
Specifically, Damen tailored the technical specifications of the
designs in line with the port infrastructure in the region in
which the dredgers will operate. Beyond this, close attention was
paid to seakeeping behavior in order to ensure the vessels can
operate comfortably and safely, even in harsh weather conditions.

Notably, and unlike traditional dredgers, the bow shape of the
MAD vessels allows them to operate in adverse weather conditions.
The shape - like many other efforts from this builder - is based
on a proven Damen design applied to renowned vessels such as the
Damen Offshore Carrier (DOC) and Platform Supply Vessel (PSV). In
addition to improved seakeeping behavior, the bow shape also
protects the sand and gravel cargo from green water ingress.

The MAD vessels have been developed with tomorrow in mind,
featuring Tier III engines and, requiring no ballast water, fully
compliant with the latest IMO regulations. That the design also
takes into account the possible future requirement for advanced
automation. Close attention has also been paid to incorporating
the most robust equipment for operations in harsh environments. A
submerged, wear-resistant Damen dredge pump facilitates the
loading of sand and gravel aboard the vessel. Once onboard, the
aggregate then passes through the heavy-duty dredgers' screening
towers, where giant sieves allow for a better assessment and
classification of the mined material. Following this, it is
stored and de-watered in the vessel's hopper - with a capacity of
either 4,000 or 5,600 m3 - hence the categorization of the two
types of MAD. The operation is supported by state-of-the-art,
optimized instrumentation, offering feedback throughout the
entire process.

Upon arrival to port, the vessels' fully automated clamshell
system unloads the material onto a conveyer belt. The system
conceived of by the design is a flexible one, suitable for use in
varying locations. According to Damen, the vessel design allows
users to do almost everything within the broad dredging mission.
Operators can go out, get the material, classify it, dry it and
deliver it to location. Damen bills the vessel as the first
standardized design in the world with such a scope.

Like all Damen 'stock' hulls, the standardized design is also
versatile and takes into account the need for customization and
multi-role functionality. Myriad options exist in order to cater
to differing client needs. The vessel can be supplied with bottom
doors if required - which will offer additional versatility in
case it is required to perform differing operations. It can also
receive spud poles, for example. And, should the client wish to
scale up at any point, the MAD 4,000 can easily be converted into
a MAD 5,600 with a simple section addition.

(As published in the February 2017 edition of
Marine News

Mar 1, 2017

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