The effects on Required Freight Rate (RFR) of hull roughness causing loss of speed at constant power are investigated. Vessel lifetime roughness profiles are postulated based on construction, coatings, operation and maintenance. These are utilized to determine the loss of speed. The results are then incorporated in a RFR analysis to determine the effects on vessel profitability. Examples are provided for ocean ore carriers. The effects of all roughness factors are incorporated over a vessel life ranging from 5 to 25 years. The formulations are directly applicable to other vessels for which a lifetime roughness profile is constructed and speed/power relationships have been determined. The approaches to developing the speed/power predictions and the roughness profile are provided. The analysis approach provides a means for investigating different magnitudes and scenarios of causes of roughness and their effects on RFR.
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SNAME Maritime Convention
October 24–27, 2018
Providence, Rhode Island, USA
Hull Roughness and its Effects on Required Freight Rate
Dillon Esposito-Kelley;
Dillon Esposito-Kelley
Webb Institute
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Paper presented at the SNAME Maritime Convention, Providence, Rhode Island, USA, October 2018.
Paper Number:
SNAME-SMC-2018-037
Published:
October 24 2018
Citation
Daidola, John C., Esposito-Kelley, Dillon, and Max Haland. "Hull Roughness and its Effects on Required Freight Rate." Paper presented at the SNAME Maritime Convention, Providence, Rhode Island, USA, October 2018.
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