Wärtsilä will supply its fixed pitch propeller (FPP) and EnergoProFin systems for two container vessels – YM Mobility and YM Milestone, owned by Taiwan-based Yang Ming Lines
Container operators are seeking energy savings through slow steaming, which requires engine adjustments to be matched by the propeller arrangement.
Wärtsilä’s arrangement allows the speed of the two vessels to be reduced from 24 to 18 knots.
The two vessels are the last in a series of four Yang Ming ships to be retrofitted with the FPP and EnergoProFin systems. The operator reported 3-5% energy savings resulting from a prior retrofit. The newly designed Wärtsilä propeller mass is roughly 27% lighter than the ships’ existing propellers.
The EnergoProFin post-swirl device is a propeller cap with fins that rotates together with the propeller and helps reduces energy loss from the flow around and behind the propeller. Wärtsilä claims the design provides average fuel savings of 2%, with a payback time of less than one year.
Yang Ming Lines chief technical officer Jackie Ho said “The two retrofit propeller projects already completed with the Wärtsilä systems have been very successful, which is why we decided to do the same with these two vessels. Wärtsilä was also able to meet our tight delivery schedule requirements, and we are very happy with the support they have provided.”
The order with Wärtsilä was placed in August 2020 with equipment scheduled for delivery in March and June 2021 to Changhong shipyard in China where the retrofitting will take place.
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