Nearly two years since its launch at the SMM exhibition in Germany in 2016, Napier Turbochargers’ NT1-14A model remains its largest-capacity unit, covering engine outputs between 5 MW and 8 MW. At the time of last year’s edition of Worldwide Turbocharger Guide, the company had indicated that an even larger model, the NT1-16A was planned, able to support engines of up to 12 MW, but there is currently no information available about progress on that project.
Its three-unit NT1 range offers the highest pressure ratio (6:1) available for this type of turbocharger, the company’s literature notes. Despite this, its compressor wheel is made from aluminium, rather than a more expensive material such as titanium, which helps keep costs down “with no compromise on performance or durability”, it notes.
It also emphasises efficiency and it is notable that Napier turbochargers were specified for engine upgrades on the three largest ships operated by the Norwegian coastal passenger operator Hurtigruten. As Marine Propulsion reported in June last year, they played a part in bringing Midnatsol, Trollfjord and Finnmarken up to IMO Tier II standards for NOx emissions.
As well as the benefits brought by new installations, many ship operators gain from Napier’s overhaul and remanufacturing service, which it offers at its factory in the UK. It is available for its NT series and many of its NA turbochargers.
During an overhaul, each turbocharger is stripped own and assessed to identify where parts need to be repaired or replaced to bring it back to as-new operating efficiencies. It also offers an exchange service, under which it stocks a matching unit to a customer’s own turbocharger which it will swap over when needed and restore the worn unit ready for future use.
Napier’s overhauls will only use its OEM components and certificates of conformity and authenticity can be provided.