Data Convincing for Container Ship Noise Replacement

MarineLink.com
Wednesday, June 05, 2013

DNV gathered before and after operational-performance data which indicate that redesigning the bulbous bow of slow-steaming container ships can produce fuel savings of 5% or above. These “nose jobs” can have a payback time of less than a year, DNV said.

Hyundai Merchant Marine (HMM) operates a series of 8,600 TEU container vessels which were designed and built for high speed. These vessels are actually able to operate at 27 knots. However, today the vessels are “slow steaming”, operating in the range of 15 to 18 knots. At these speeds, the existing bulb is not efficient.

To quantify the possible savings potential, DNV carried out a comprehensive study to develop a new bulbous bow shape optimized for the expected trading conditions. A cost-benefit assessment was conducted based on the estimated savings and this created the basis for HMM to go ahead with a conversion.

Based on input from DNV, Daewoo Ship Engineering Company (DSEC) carried out the structural design work. The conversion of the first vessel, the Hyundai Brave, was completed in March 2013.

Onboard measurements have shown that the $680,000 modification has reduced fuel consumption by almost 1,000 tons per year.

“The performance of the new bulbous has carefully been evaluated as part of verification over about 2 months period after delivery and fuel saving in operation so far has been found to be around 5% or above. The payback period is expected to be much shorter than the 1 year originally estimated,” said Taeg-Gyu Lee executive vice president of HMM.

“Close cooperation between DNV, the structural designer and the yard ensured the timely execution of the design and installation work,” said Jost Bergmann, DNV’s Business Director for Container Ships. “Improvements in fuel economy have now been demonstrated in loaded, light and full capacity operations.”

The project, starting with the initial planning phase, was completed in 14 weeks and, with pre-fabrication, the yard erection work was completed in only two weeks during the vessel’s regular docking cycle.

DNV developed a series of potential bulb shapes, made to suit the new operating profile of the Hyundai Brave, that where all tested by use of computational fluid dynamics. The new bulb does not add to the vessel’s overall length and is five tons lighter than the original.

DNV said it is confident that the recorded success of this project will assist other owners looking to improve the competitiveness of older vessels.

“Existing ships have to compete with a new breed of efficient and flexible designs,” Mr. Bergmann said. “One result of the high design speed of many existing container ships is that the bulb is highly tuned to reach the maximum speed. The new reality for much of the existing fleet is that this affects efficiency at lower speeds. DNV’s bulb optimization service now has hard data to demonstrate.”

www.dnv.com

Maritime Reporter November 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Ship Repair & Conversion

NMEA Updates Installation Standards

2014 edition of NMEA 0400, Version 4.00 features extensive updates and new information   The National Marine Electronics Association (NMEA) has published Edition 2014, Version 4.

Hoists Facilitate Offshore Crane Repairs

When the diesel engine of a deck crane failed, it caused major handling problems for an offshore platform operating in the Dutch sector of the southern North Sea,

NASSCO Opens Bremerton Repair Facility

General Dynamics NASSCO celebrated the grand opening of its new location in Bremerton, Wash., yesterday. The facility will support the company’s recently-awarded contract to repair and maintain U.

Container Ships

US Shippers, West Coast Dockworkers Union Resume Contract Talks

Negotiators for shipping lines and terminal operators at 29 U.S. West Coast ports resumed contract talks with the union for dockworkers on Thursday, as cargo backups continued at the ports,

K Line to Expand Use of Eco-efficiency Software

Three further K Line vessels to install ClassNK-NAPA GREEN eco-efficiency software after reporting fuel savings during trials on an 8,600 TEU container vessel   NAPA

Even 'Small' Vessels are Getting Bigger

The Shipowners’ Club is a mutual provider of P&I insurance that has throughout its 160 year history been dedicated to serving owners of small and specialist ships.

Vessels

Cecon Secures Finances to Complete Newbuild

Cecon ASA has petitioned for a debt restructuring agreement (in Norwegian: gjeldsforhandling). Certain funds managed by York Capital Management Global Advisors,

Waterjet-propelled Crewboat Delivered to Petrobras

BS Camburi, a 36-meter Monohull Crewboat built in Brazil by Arpoador Engenharia to the Petrobras type P2 specification has been launched and delivered.   Designed by Incat Crowther,

K Line to Expand Use of Eco-efficiency Software

Three further K Line vessels to install ClassNK-NAPA GREEN eco-efficiency software after reporting fuel savings during trials on an 8,600 TEU container vessel   NAPA

 
 
Maritime Careers / Shipboard Positions Maritime Security Offshore Oil Pipelines Port Authority Salvage Ship Repair Ship Simulators Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1158 sec (9 req/sec)