Marine Propulsion Improvement


Measure your vessels overall performance by using torque meters.


Torque measurement is used for:

  • Measuring changes in the ships overall performance
  • Indicating performance improvements for engine, hull and/or propellor
  • Reducing fuel consumption
  • Reducing emissions of greenhouse gasses
  • Reducing operational costs

Reduce fuel costs by 5% or more.

Torque meters can help you identify hull and propellor fouling right from the start.
Inefficiencies can be determined by comparing the vessels shaft horse power to the data provided by the manufacturer.
Getting rid of fouling saves up to 5% (or more) on fuel costs.
Furthermore, maintenance intervals on the engine can be increased because of accurate measuring.

What is ShaPoLi?

Shaft power limitation or ShaPoLi refers to the restriction imposed on the power output of a ship's propulsion system. It is a concept implemented to ensure the safe and efficient operation of the vessel and its machinery. The shaft power limitation is typically determined based on various factors, including the design and capabilities of the propulsion system, the structural integrity of the ship, and operational considerations.

There are several reasons for implementing shaft power limitations:

  1. Structural Integrity: Ships have specific design limits, including the strength and structural integrity of their hulls, shafts, and propellers. Exceeding the recommended power output may put excessive stress on these components, potentially leading to structural failures or damage.

  2. Efficiency and Fuel Consumption: Operating a propulsion system at higher power levels does not necessarily result in proportionate speed gains. Instead, it often leads to increased fuel consumption without significant performance benefits. By imposing shaft power limitations, ships can operate at optimal power levels, striking a balance between speed, fuel efficiency, and overall performance.

  3. Safety: Overloading the propulsion system beyond its intended capacity can lead to mechanical failures, increased wear and tear, and potentially compromise the safety of the vessel and its crew. Setting and adhering to shaft power limitations helps maintain the reliability and safety of the ship's propulsion system.

Shaft power limitations are typically defined by the ship's manufacturer, naval architects, or classification societies. These limitations consider factors such as the engine's power rating, propeller design, and the vessel's operational requirements. They are often documented in the ship's technical manuals and operating guidelines, and adherence to these limitations is important for the safe and efficient operation of the vessel.


Marpol Annex VI:

Emissions of diesel engines and their efficiency is a key performance measurement, demonstrated by the EEDI (Energy Efficiency Design Index), compliant to Marpols emission standards.
Theoretical CO2 emission performances of new ships are measured, and calculated from ship design and engine performance data.
The engine efficiency (or specific fuel oil consumption) is measured using a shaft torque meter along with fuel flow meters, to demonstrate compliance to this requirement.


Predictive vessel performance monitoring:

With constant engine performance measuring, you collect data that tells you how the ship should be operating in normal conditions.
Under changing conditions the torque meter will respond accordingly.
Accurate torque measurements, directly from the shaft, indicate when engine, propellor, or other performance begins to degrade, giving you the opportunity to respond before downtime occurs.


Want to know more detailed information about Torque meters and Marine Propulsion Improvement?
Check the leaflet below: