HollandMT develops 500 m3 TSHD

Woerden (The Netherlands), on Monday December 1st 2014 HollandMT launched the design for a 500 m3 Trailing Suction Hopper Dredger (TSHD), suitable for maintenance dredging of inland- and sheltered waters.

The hopper dredger is specially designed to operated in shallow waters, therefore the minimum vessel draught is limited to only 1.2 m. Due to its unique hull form, in unloaded condition the dredger has an even trim condition, without any ballast water.

The dredger is designed in accordance with the rules of Bureau Veritas, features a single dragarm, direct diesel driven inboard dredge pump, 4 sets of double bottom doors, side-discharge connection, and 4 adjustable overflow valves.

In the aft of the vessel, the engine room is situated, comprising the main propulsion machinery with 2 x FPP, diesel generator, harbor generator and auxiliary equipment. The dredge- and jet-pump are located in the fore ship and are each powered by a diesel engine.

The wheelhouse and compact accommodation are located in the fore ship and is fitted with 3 double crew cabins, a messroom and galley.

The hull is designed in such way that it can be easily fabricated, assembled and launched by local shipyards. In this instance, HollandMT can supply the ship design and ship/dredging equipment package, as well as shipyard support services to assemble and test the dredger.

For maintenance to ports and precision dredging, the dredger can optionally be fitted with a grab crane on the aft deck and a spud mooring system.

The TSHD 500 m3 provides a very versatile, robust, efficient, economic and easy-to-operate dredging solution for sheltered water applications.

HollandMT supplies special dredging equipment

In the first half of 2014 HollandMT has been involved in some special equipment projects.

Among these projects were design and supply of:

• Special 350 mm coupling units; 10 bar quick release units destined for ballasting an offshore platform. Coupling mechanism is in heavy duty execution and can safely be operate by remote hydraulic device.
• 650 mm quick release couplings for floating dredge pipe; in order to quickly disconnect a floating pipeline for dredging operation, the hydraulic operated quick release coupling provides a safe and time efficient solution.
• Overflow with hydraulic operated anti turbidity valve; In order to control overflow losses and to limit surface water pollution, a hydraulic operated regulating valve was incorporated in a standard overflow.

Above mentioned equipment was designed and fabricated for purpose. All products were designed in 3D engineering software and FEA analyses were conducted. Various parts were fabricated at HollandMT’s workshop in Dalian after which the systems were finally assembled and tested in the Netherlands.

HollandMT designs Plain Suction Dredger

For dredging and deepening of inland lakes, estuaries and mining & tailing ponds, HollandMT has developed a Plain Suction Dredger (PSD). The PSD350 Plain Suction Dredger is fitted with a 350 mm dredge pipeline system and is designed for dredging up to 40 m below water level. Reduced dredging depth can be achieved by reducing the length of the lower dredge pipe. The dredger is equipped with a high pressure jetwater system and a specially developed plain suction head which enables dredging of free flowing sands or silt-like material. The dredger is equipped with 1 submerged dredge pump on the ladder and 1 deck-based booster pump, enabling the dredger to pump the dredged material to discharge distance of approximately 3000 m. 

The dredge is electric powered via shore supply (10kV) and both dredge pumps are controlled by means of frequency converters. The dredge is moored by means of 4 electric mooring winches. The ladder and lower dredge pipe are raised by electric winches as well. The fully air-conditioned control cabin is mounted on top of electric switchboard room, providing a clear overview of the dredging operations. The dredge is equipped with production measurement system, dredge monitoring system and dredge-track position system.

HollandMT celebrates 5 year anniversary

On January 23rd HollandMT has celebrated its fifth anniversary.

From 2009 to 2014, HollandMT developed from a junior design company into a highly qualified engineering & contracting company serving the international dredging and offshore industry. HollandMT has provided customers with tailor made design and equipment solutions.

Over the past 5 years, HollandMT has expanded its engineering and project management capacity. This forms HollandMT's core competence and over the years, HollandMT has supplied various designs and equipment systems for Trailing Suction Hopper Dredgers, Water injection dredgers and Cutter Suction Dredgers.

HollandMT thanks her loyal customers, partners, fabricators, co-makers and employees for their dedicated support over the past years and we confidently look forward to a future of new dredging and offshore engineering challenges !