MAN Energy Solutions’ (MES) after-sales division, MAN PrimeServ, has completed a retrofit project on board Ambassador Cruise Lines’ ‘Ambience’.
She is managed by Bernhard Schulte Cruise Services.
Selective catalytic reduction (SCR) systems were installed, while on two of the ship’s four MAN 8L58/64 engines their NA57/T turbochargers were replaced with more modern MAN TCA 66 units.
Ambassador is offering cruises on the ‘Ambience’ in the key Norwegian Heritage fjords with its exacting Tier III emission standards, hence the need for an upgrade, MAN said.
Olaf Gunia, Head of PrimeServ Hamburg, said: “This retrofit really establishes Ambassador’s green credentials within the cruise segment and the SCR solution is performing well with a NOx removal rate of 93%.
“Increasingly, we are receiving similar requests from cruise and ferry operations that wish to become sustainable without the need for mandated industry legislation,” he said.
Bernd Siebert, Head of Retrofits & Upgrades, MAN PrimeServ, added: “This entire project proved challenging owing to – among other factors – the long cold lay-up of the ship, due to the covid-19 pandemic, and the tight time frame for completion.
“Happily, our work on the ‘Ambience’ has optimised the interaction between the newly installed SCR system, turbochargers and engines and the vessel is now Tier III-compatible and fit for service in one of the globe’s most pristine, natural environments,” he said.
MAN’s SCR system will be available from just 15% engine load, enabling clean operation while slow steaming in the fjords, as well as close to port and populated areas.
The fully modular SCR solution has also been fully integrated into the ‘Ambience’s’ engine-control set-up.
With its closed-loop system and a weather station that uses environmental data, the NOx-reduction rate is maximised and ammonia-slip minimised to just 10 ppm, comparable to that of a car.
Ammonia is a greenhouse gas and affects the climate but it also reduces urea consumption enabling the urea tank size to be minimised on board.