Seatrade Maritime is part of the Informa Markets Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Bulbous bow pays off in a year

Bulbous bow pays off in a year
Bulbous bow refits can pay for themselves through reductions in fuel costs in as little as a year, DNV announced yesterday at Nor-Shipping.

The findings came from a DNV optimisation project with Hyundai Merchant Marine (HMM) and Daewoo Shipbuilding and Marine Engineering subsidiary DSEC, which saw the Korean yard retrofit an optimised bulbous bow to a five year old, 8,600 teu HMM container ship.

The retrofit increased fuel efficiency by 5%, exceeding predicted gain from computational fluid dynamics models.

Affectionately known as a nose job, bulbous bow optimisation replaces a bow designed for faster operating speeds with one better suited to a vessel's actual operating speed and draft, adjusting to current market realities such as slow steaming.

For the HMM ship the design speed was 27 knots and the vessel currently operates between 15 and 18 knots, rendering its original bulbous bow inefficient.

Costing around $625,000 in total and completed within a routine dry-docking period of two weeks, the refit did not add any extra downtime for the vessel and will repay the initial investment within one year at current bunker prices.

DSEC said, "after we got the results of this modification, we gave the information to some owners who built container vessels at DSME and several owners are interested and have requested proposals."