Customisation and craftsmanship go hand in hand
13 September 2016
New measurement techniques and computer models have made it possible to improve the hydrodynamics of ships and propulsion even further, resulting in fuel savings. Vessels on the inland waterways also benefit from calculations made using advanced CFD (Computing Fluid Dynamics). "We use the technology to modify the profiles of nozzles", says René van Middelkoop, Sales & Marketing Manager for Damen Marine Components. "Lower fuel consumption is good for the ship owner, because of the cost reduction, and it is also good for the climate, because less CO2 is emitted."
Damen Marine Components is the world market leader in nozzles. Quality and sustainability were already important drivers. "For example, we use the best stainless steel and build as lightly as possible”, says Van Middelkoop.
At the Shipping Technics Logistics trade show, the company will be sharing a stand with Promarin, a propeller and propeller shaft supplier and service provider. Promarin is not only Damen Marine Components’ dealer in Germany, the companies also regularly carry out projects together.
Sales engineer Kees Oevermans of Damen Marine Components says: “We will be revealing the great results of that partnership at the trade show. On the stand, we will be demonstrating a complete propeller shaft line like the ones we manufacture together for inland shipping. Promarin supplies the propellers; we supply the nozzles, shafts and tubes."
Van der Velden Marine Systems, a sister company of Damen Marine Components since 2013, completes the picture with the rudders. Van Middelkoop: "Their activities in rudders are increasingly integrated with ours. They sell and design the rudders and we manufacture them.”
Damen Marine Components is located in Hardinxveld-Giessendam. In addition, the specialist firm has production sites in Poland and China. The latter moved to a new location a year ago.
The nozzles are used in all types of ships, from coasters to offshore and from dredging to inland shipping. The specialised spinning machines play the main role in manufacturing, says Van Middelkoop. “This allows us to process any desired plate thickness in the exact shape and to the ship's specifications. The stainless steel plate is cold-moulded and consists of a single piece.”
“It's tailor-made. We have a number of standard sizes in stock for inland shipping: from 1,500 to 1,900 millimetres. For other submarkets we have plates in stock, in various thicknesses. This enables us to respond to customer requirements quickly and flexibly.” The maximum diameter is 8 metres.
Three of our own nozzles have been successful in the market for years: the Wing (especially suitable for fast ships), the VG40 (specifically for thrusters) and the Optima. "The latter is the ideal nozzle for inland shipping and is available in various versions, depending on whether you want more speed or more thrust.”
“A pusher tug such as the Veerhaven III is certified with two engines, whereas its predecessors needed three. Nevertheless, the Veerhaven III has sufficient thrust to push six loaded barges and to come to a dead stop again within the prescribed distance!"
The Optima is also available in various versions, depending on the requirements of the ship owner. Oevermans: "The length of the nozzle is usually equal to half the propeller diameter. But if you make it a little shorter, a factor of 0.4 instead of 0.5, the ship gains more thrust at a higher speed. If more thrust is needed, we instead extend the tube, to a factor of 0.6, for example in pusher tugs."
At Damen Marine Components they know what they're talking about. Advice is an important part of sales and service. “It will always be a matter of custom building and craftsmanship."
Source: De Binnenvaartkrant no. 13, 13 September 2016