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Reducing fuel usage and CO2 emissions from tug boat fleets: sea trials and theoretical modelling

Reducing fuel usage and CO2 emissions from tug boat fleets: sea trials and theoretical modelling
Reducing fuel usage and CO2 emissions from tug boat fleets: sea trials and theoretical modelling

Sea trials on a harbour tug have been conducted and are explained. The experimental results for fuel consumption per unit transport effort, under free-running (transiting) conditions, are presented and engine speed-propulsor pitch combinations for improved fuel economy are identified. A simplified analytical approach to predict fuel consumption, including the coupled engine-propulsor-hull system, is described. This rationale is combined with experimental observations and, consequently, performance maps present the complete operating envelopes of the harbour tug under both free-running and towing conditions. This combined approach proved to be effective and can be applied to the study of other tug vessels. As a consequence of this research, the engine control system on the harbour tug was modified to permit it to operate fully within the region of best fuel economy during free-running. The results from the bollard-pull predictions provide insight for the design and operation of harbour tugs in the future.

1479-8751
A31-A41
Murphy, A.J.
8e021dad-0c60-446b-a14e-cddd09d44626
Weston, S.J.
3e36e92a-bfbb-4249-aaee-7f13aa0086ec
Young, R.J.
220c9e6b-b310-44f4-bc22-3730eaae1643
Murphy, A.J.
8e021dad-0c60-446b-a14e-cddd09d44626
Weston, S.J.
3e36e92a-bfbb-4249-aaee-7f13aa0086ec
Young, R.J.
220c9e6b-b310-44f4-bc22-3730eaae1643

Murphy, A.J., Weston, S.J. and Young, R.J. (2012) Reducing fuel usage and CO2 emissions from tug boat fleets: sea trials and theoretical modelling. Transactions of The Royal Institution of Naval Architects Part A: International Journal of Maritime Engineering, 154 (A1), A31-A41. (doi:10.5750/ijme.v154iA1.873).

Record type: Article

Abstract

Sea trials on a harbour tug have been conducted and are explained. The experimental results for fuel consumption per unit transport effort, under free-running (transiting) conditions, are presented and engine speed-propulsor pitch combinations for improved fuel economy are identified. A simplified analytical approach to predict fuel consumption, including the coupled engine-propulsor-hull system, is described. This rationale is combined with experimental observations and, consequently, performance maps present the complete operating envelopes of the harbour tug under both free-running and towing conditions. This combined approach proved to be effective and can be applied to the study of other tug vessels. As a consequence of this research, the engine control system on the harbour tug was modified to permit it to operate fully within the region of best fuel economy during free-running. The results from the bollard-pull predictions provide insight for the design and operation of harbour tugs in the future.

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More information

Published date: January 2012
Additional Information: Funding Information: The authors would like to thank the tug crews and Svitzer for their support and assistance for this research.

Identifiers

Local EPrints ID: 484066
URI: http://eprints.soton.ac.uk/id/eprint/484066
ISSN: 1479-8751
PURE UUID: 66178666-6ed8-4ba0-9f9e-309773387936

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Date deposited: 09 Nov 2023 18:06
Last modified: 10 May 2024 17:03

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Contributors

Author: A.J. Murphy
Author: S.J. Weston
Author: R.J. Young

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