The Ultimate Project: INAI KENANGAVULKAN Couplings supplies the largest MESLU clutches for one of the largest suction dredgers in the world
THE SHIP Inai Kenanga
THE SHIPYARD Inai Kiara SDN BHD, Malaysia
THE CHALLENGE One of the largest suction dredgers in the world, Inai Kenanga, is to be launched by Inai Kiara SDN BHD, the Malaysian shipping company. The suction dredger is fitted with a double diesel engine that drives the propellers, the generator and the suction pump system. The controllable pitch propellers of the main drive are driven via the two main Siemens/Flender gearboxes directly from the flywheel side of the main engines. The generator for the electrical power supply is also connected via the PTO of the main gearbox with the main machine.
The two suction pump systems are installed on the front side of the engines. In order to generate the maximum suction power, a special Siemens/Flender multi-speed gearbox is located upstream from each of the suction pumps. This special drive configuration ensures optimal loading and discharge process. The pumps can be connected in series for discharging the loading on land. Two MAN 12V48/60B engines with a power rating of 13.250 kW each are used as the main engines.
THE SOLUTION As the solution provider, and apart from the MESLU clutches, VULKAN Couplings is also supplying all highly flexible couplings for both the main as well as the suction pump drive.
Comparison of the sizes Gearbox produced by Siemens Flender in Voerde, in the front Sascha Greschkowitz.
RATO S 582Z have been installed in each of the main drive; meanwhile, highly flexible RATO R 473Z provide the necessary torsional vibration damping and compensation of the misalignment in the pump system on front side.
THE BENEFIT of this holistic solution for the customer: The complete drive system can be optimally adjusted with respect to torsional vibration as a result of all couplings coming from a single source. This leads to maximum system availability and contributes to minimising the operating costs.
The two Siemens/Flender 3-speed sand pump gearboxes of type GJZ 2250, however, posed a special challenge for the couplings specialist from Herne. For this purpose, VULKAN Couplings produced a total of six MESLU clutches, each one of size 540 for shifting the first gear, and two smaller MESLU 330 couplings for shifting the second and third gear.
Based on the special shaft arrangement (Quill shaft) of the 3-speed pump gearboxes of the Inai Kenanga, it was necessary to modify the standard MESLU design.
In this case the hollow shaft of the respective gear had to be connected with the outer part and the solid shaft lying inside with the inner part of the clutch. As a result of the solid and hollow shafts of the gearbox supported on one another, the inner bearing of the standard MESLU design could be omitted. However, the weight of the MESLU clutch in conjunction with the large distance of the centre of gravity to the bearing of the solid shaft on the gearbox side made it necessary to have an additional bearing support in the clutch coupling.
The VULKAN experts developed special pneumatic control units as well as a special monitoring system for the shifting logic of the gearbox with the gear blocking required.
VULKAN Couplings has supplied six MESLU clutches for the shift gearboxes of the powerful sand pumps - these couplings are the largest that the company has ever built.
Click here to learn more abouth the MESLU.