For port operation tugs, it is recommended to use elastic coupling connections with low-speed, high-torque propellers; for passenger ferries that require frequent start and stop, a hydraulic coupling is recommended to effectively reduce transmission system impact; for continuously operating generator sets, the cooling system configuration needs to be specially enhanced, and it is recommended to add an auxiliary cooling pump. We suggest that shipowners consider not only the initial purchase cost when selecting an engine but also the operational benefits over the entire lifecycle. According to actual operating data, the 6WH17 engine, through optimized fuel efficiency and longer maintenance intervals, can help shipowners save approximately 15% of total operating costs over five years.
The closed‑loop water‑cooling circuit maintains coolant at roughly 85 °C at 2200 rpm, giving a thermal resistance of only 0.12 K/W—far better than the ~0.25 K/W typical of comparable air‑cooled units. All piping is 316L stainless steel with cathodic protection, limiting corrosion to < 0.02 mm yr⁻¹ and ensuring a minimum five‑year continuous sea‑service life.
By systematically analysing the four principal NVH sources—combustion, mechanical impact, exhaust and cooling‑system noise—and applying four proven mitigation technologies—engine isolation pads, two‑stage mufflers, elastic supports and low‑noise pumps—the SC11CB220G2B1 and 6M33C750‑18 achieve 7‑9 dB and 8‑9 dB reductions respectively, with vibration peaks falling by roughly 40 %.
For port operation tugs, it is recommended to use elastic coupling connections with low-speed, high-torque propellers; for passenger ferries that require frequent start and stop, a hydraulic coupling is recommended to effectively reduce transmission system impact; for continuously operating generator sets, the cooling system configuration needs to be specially enhanced, and it is recommended to add an auxiliary cooling pump. We suggest that shipowners consider not only the initial purchase cost when selecting an engine but also the operational benefits over the entire lifecycle. According to actual operating data, the 6WH17 engine, through optimized fuel efficiency and longer maintenance intervals, can help shipowners save approximately 15% of total operating costs over five years.
