Turbocharger (MET, TPL, A100-L)

A marine turbocharger recovers exhaust energy in a single-shaft turbine, which drives a compressor that delivers charge air to the engine. The names cover the main axial-flow lines on large two-stroke and medium-speed engines: Mitsubishi MET (MET33 through MET90 frame sizes), ABB TPL (internally supported, replacing the older externally supported VTR), and the MAN ES TCA axial series now succeeded by the TCT, which reaches about 80 percent efficiency in two-stage arrangements. Modern units run pressure ratios of 4 to 5 and exhaust inlet temperatures near 550 degrees C. Higher turbocharger efficiency directly lowers SFOC.