MAN ES' dual-fuel, methanol-ready GenSet passes type approval test

German engine manufacturer MAN Energy Solutions (MAN ES) has achieved the type approval test (TAT) of its MAN L35/44DF engine for use as an auxiliary GenSet and for electric propulsion, operating at constant speeds of 720 and 750 rpm, respectively.

The TAT involved the testing of both 35/44DF variants, namely the methane-capable 35/44DF CD and the methanol-ready 35/44CD, MAN ES revealed, adding that the event took place from April 7-11, 2025, at the Changwon headquarters of STX Engine in South Korea, with the participation of six classification societies.

As disclosed, the L35/44DF CD engine is an upgraded version of the L35/44DF CR engine, first launched in 2015. Among other features, it comes equipped with an adaptive combustion control (ACC) system that monitors the state of combustion in real time for optimal fuel-injection conditions, MAN ES noted.

The GenSet reportedly aims to reduce shipowners’ capital expenditure (CAPEX) and operating costs (OPEX), while remaining relevant for the coming decades. As per MAN ES, the 35/44DF CD features minimal greenhouse gas (GHG) emissions, and compared with industry standards, it can reduce methane slip by