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Antifouling Performance Monitoring

Study on the design of an in-housemonitoring system for speed performance

Rechten: Alle rechten voorbehouden

Antifouling Performance Monitoring

Study on the design of an in-housemonitoring system for speed performance

Rechten: Alle rechten voorbehouden

Samenvatting

For ships that operate in varying trading areas, at an even ratio of prolonged sailing days and idling days and/or at varying speed instructions, marine fouling is an important risk for the speed performance of the ship. Since the conclusion in 2001 of the AFS Convention (the International Convention on the Control of Harmful Anti-fouling Systems in Ships), paint manufacturers struggle to develop antifouling marine paints that are effective on ships that are characterized by these operational parameters. The company Seatrade Groningen is specialized in the management of specialized reefer ships which carry perishable commodities. A big part of these ships sail in varying trading areas and/or have long idling periods. Therefore the company is interested to know how technical measures can be taken in the most effective way to minimize the consequences of marine fouling for the speed performance.
In the research project "Antifouling Performance Monitoring" an advise is acquired for how an automatic measurement system can be designed to monitor the progress and the actual values of the speed loss caused by marine fouling, based on the calculation of the performance speed by the available speed and fuel consumption monitoring systems of the company. Furthermore an advise is acquired about what the benefits are for the ship manager and the ship operator of the monitoring of the speed loss caused by marine fouling.
A Speed Loss System is made for each speed and fuel consumption monitoring system, which automatically calculates a trend line to express the speed performance through time. The system is based on the recalculation of the speed of a ship to the performance speed, where all interfering external and internal factors are eliminated, and the performance speed and shaft power is converted to a reference draft and reference speed. The performance speed and the power are transformed into a unit of the speed performance, which is either speed deviation or the main engine fuel oil consumption at a reference speed. The calculation of the speed performance is an important subject of study of maritime academies and various other academies. Although a diversity of calculation models exists for the effects (of, for example, weather factors) to the performance speed, only a few can be used for the Speed Loss Systems because of the limited data that is available.
The measurement results of the Speed Loss Systems show that Octopus can be used for a measurement system to monitor the effect of marine fouling on the speed performance. The measurement results obtained with the system have a standard deviation of 1.55%. The use of Noon reports, Fleetweb and/or the Monthly main engine performance reports in the current way, is not advised for a measurement system to monitor the effect of marine fouling on the speed performance.
The measurement system bears financial benefits and benefits for the control and reduction of CO2 emissions of the ships. One benefit is that if the resistance caused by marine fouling and the progress of this resistance through time is known, then it is possible to investigate when it is the most optimal moment in time to take action to minimize the marine fouling. Another benefit is that the measurement instrument can assist in comparing the effectiveness in antifouling properties of different paint systems. It is important to stay aware of who pays for the costs of the speed loss and the reduction in effectiveness of the antifouling paint system, this may change with the operation of the ship. The actual payback of the investment of speed performance measurement, remains subject for further research.
One recommendation of the research is to further attempt to perform Main engine performance tests at similar conditions where the interference of internal and external factors is reduced as much as possible. Further investigation is necessary to determine if by performing the tests at these described conditions, a speed performance monitoring system can be created that is an alternative to the speed performance monitoring system based on Octopus.
Another recommendation of the research is to perform sea trials after each dry dock, to get power-speed curve and thrust-speed curve at different engine load conditions. Most optimally would be to perform a sea trial test at different ballast and/or loading conditions, to obtain knowledge of the power-speed and thrust-speed curve at different drafts. If the ship doesn't have to maintain a timeframe, the total costs of performing a sea trial are considered to be about 2,500.- to 3,000.- EU.

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OrganisatieHZ University of Applied Sciences
OpleidingMaritiem Officier
AfdelingDe Ruyter Academie
PartnersSeatrade Shipmanagement
Jaar2014
TypeBachelor
TaalEngels

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