Turbocharger retrofit solution keeps engines running smoothly

Fishing vessels of Project Atlantic-488 (Moondzund) are equipped with medium-speed SKL engines, of the type 6VDS48/42 AL-2 and operate under demanding conditions with long running hours and stable load profiles. For these vessels, turbocharger performance and reliability have a direct impact on fuel consumption, engine temperatures and overall operational stability.

The first turbocharger retrofit installation on a Project Atlantic-488 vessel was completed in 2017. This installation confirmed the technical concept and demonstrated reliable performance in regular service.

One of the main drivers for selecting Hedemora HS5800 turbochargers was the fact that the original turbochargers installed on these engines are no longer in production. As a result, availability of spare parts has become increasingly limited, creating operational and maintenance challenges for vessel owners. The HS5800 retrofit provides a technically compatible and sustainable alternative, ensuring long-term serviceability and access to spare parts.

In addition to compatibility aspects, the selection of Hedemora turbochargers was based on several key factors important for vessel operators. These include modern manufacturing processes, ensuring consistent quality and dimensional accuracy, as well as the use of proprietary design solutions and in-house know-how developed specifically for medium-speed marine engines. High turbocharger efficiency contributes to optimised air supply, stable engine temperatures and reduced fuel consumption under continuous operation. Another important factor is the long-term availability of spare parts and overhaul components, supporting predictable maintenance planning throughout the service life of the equipment.

“High turbocharger efficiency contributes to optimised air supply”

As the retrofit programme was extended to additional vessels of the same type, operational experience was accumulated across a wider range of engines and operating conditions. This experience highlighted the importance of precise turbocharger matching and careful adaptation to the actual condition and operating profile of each engine.

These aspects were addressed through continuous co-operation with the vessels’ technical personnel, engine service companies and vessel owners. Where required, design adjustments and matching refinements were introduced, based on feedback from operation.

A key part of the retrofit approach is direct contact with onboard and shore-based technical staff. Vessel operators have direct access to the turbocharger manufacturer’s specialists, allowing fast response to technical questions and practical support during operation. Requests from the vessels are handled promptly, and necessary actions are implemented within short timeframes.

To date, turbocharger retrofits have been completed on four Project Atlantic-488 vessels. Based on operational experience accumulated since 2017, the retrofit solution has been refined into a stable and proven configuration. Two additional installations on vessels of the same type are already planned for the current year.

In addition, Hedemora Turbo & Diesel offers retrofit solutions for operators currently running legacy H6-1 turbochargers, where original units and spare parts are no longer available. The retrofit programme provides a long-term alternative for vessel owners seeking to maintain reliable operation of SKL engines without dependence on obsolete turbocharger models.