Predominantly ShaPoLi systems aid in achieving the necessary EEXI value for vessels which don’t fall under the scope of upcoming regulations, as they are the most cost-effective solution for this problem.
The systems can be upgraded to more advanced versions, which save fuel and provide real-time measurements, that can be used for improvement and analysis of the operational profile.
Shaft Power Limitation (ShaPoLi), as stated in MARPOL Annex VI, MEPC.335(76) EEXI regulations, is a system, where a torque transducer is attached to the propeller shaft that is continuously measuring shaft RPM and torque, effectively calculating the power output from real-time readings.
The pure base of the system consists of the torque transducer (Shaft power meter, SPM), interface box and HMI display/-s. Additional options for equipment/machinery efficiency measurements, such as fuel oil meters and viscosity meters, can be added to the system, alongside interconnection of controlled pitch propeller to act as a dynamic tuning system (ShaPoLi system can regulate propeller’s pitch & engine RPM to produce best thrust with least expenditure of power), resulting in fuel economy upwards to 9%, vessel operation profile permanent stability and early identification of hull fouling.
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