Preparing for the future

Nowadays, we have all gotten used to the IMO tier 3 and Euro Stage V standards. These standards, which were called into life to improve our environment, represent the emissions that combustion engines are allowed to have.

The great news is that ADS van STIGT also wants to reduce emissions and meet the requirements for a significant reduction in greenhouse gas emissions. The maritime industry is working hard to reduce emissions; transport by water is a favourable mobility but it is also a large consumer. This means that we will have to handle our energy consumption in a smart way, in every industry.

We have optimisation of the hull design, smart rudders, folding tunnels, you name it. But there is also room for improvement in propulsion methods and we see a shift from a diesel direct drive to hybrid, but also the optimisation of energy consumption on board. By optimising a ship’s hull and supporting wind power, less power is needed for propulsion and a small combustion engine with the addition of an electric motor will su ce. A hybrid gearbox is a wonderful solution here; sailing on a small generator set whenever possible and preparing for a future driven by renewable energy, while still being able to continue with reliable proven technology. Often, 2/3 of the power is su cient for most of the journey and 1/3 is suitable for entering ports or locks and for those times when it is really needed, 100% is available in boost mode. At ADS van STIGT, they see beforementioned as an intermediate solution; thinking about how it is possible and what is needed provides a lot of insight and o ers either a net saving or a suitable solution. If we want to go even further and fully prepare for the future with renewable energy, a PTIgearbox still seems an excellent solution, as the combustion engine will use other fuels and may need support from an electric motor powered by a fuel cell or battery pack through the PTI.

It is also an option to switch to a 100% electric drive. An electric motor is mounted directly on the thruster, whereby an e ciency improvement is achieved due to the elimination of the upper gearbox; this is called an L-drive. A compact electric motor provides many advantages for the ship designer. In the coming years, we will also have a greater need for ships with various DPnotations. With an electrically driven thruster, the DP plot can be carried out well and, under favourable conditions, emissions can also be greatly reduced. In addition to the thruster, many ships will continue to sail with a conventional powertrain in which the reversing gearbox is replaced by a non-clutchable reduction gearbox. The advantage of this solution is that the propeller thrust is absorbed and the reduction will make it easier to choose an electric motor; e ciency is improved by increasing the size of the propeller diameter and >>

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Email: temse@liftal.com thus reducing to the optimum propeller speed. The total weight will also be more favourable, which will have a direct positive e ect on the ship design; less weight also ultimately means less emissions per ton/km.

For shallow water work vessels, the draught is a big thing, so weight savings and/or the positioning of heavy components around the centre of gravity of the vessel is the solution.

By using carbon reinforced shafts, limited weight is added, less intermediate bearings are needed, and torsional and misalignment challenges are solved as well.

In addition to the mechanical drive, ADS van STIGT is currently working on an enhanced service by o ering full electric systems together with its sister company Verhoef EMC, who is a system integrator and has over half a century of experience on board of all kinds of vessels.

ADS van STIGT was founded in 1970 with the main activity in transmissions and gearboxes for maritime and industrial applications. This is still the main source of ADS van STIGT’s activities. A significant number of other products have been added to the range, such as planetary gearboxes, pump drives, control systems, monitoring systems, controllable pitch propellers, thruster systems, carbon fibre shafts, dampers, elastic couplings and sensors. ADS van STIGT’s expertise ranges from pleasure to mega yachts, and from fishery to commercial shipping, o shore, and dredging. A well-equipped service team is supporting the sales activities worldwide. i. vanstigt.com