Shaft Power Limitation (ShaPoLi)

Brochure Manual Certificates

Shaft Power Limitation (ShaPoLi)


Per the first of January 2023, all sailing vessels above 400 GT falling under MARPOL Annex VI must comply with the latest Energy Efficiency Existing Ship Index (EEXI) regulations from the International Maritime Organization (IMO) for regulating propulsion energy efficiency. Most sailing vessels must limit their propulsion power to comply with these EEXI regulations. You are well-prepared with the VAF Shaft Power Limitation (ShaPoLi) Solution.


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We present: Shaft Power Limitation (ShaPoLi)

The VAF ShaPoLi Solution ensures that your actual power is accurately recorded and can be limited to the allowed EEXI maximum. Our solution consists of three component parts:

  • Shaft power/torque meter to monitor shaft power (T-Sense®) (optional, since our ShaPoLi is also compatible to 3r party torque meters)
  • Data collection box (SDB-3)
  • Bridge panel for data visualization and crew interfacing (SBP-3)

In emergencies, for safety reasons, you can immediately use the engine power reserve. ShaPoLi alerts you visual and audible when the EEXI power limit is exceeded. Automatic data logging of these events ensures that the PSC can always verify your actions.

In providing these insights into shaft power, the system helps to ensure that the vessel remains within its required EEXI limits. Should power exceed the EEXI limit, the system alerts the crew, with an alarm that is both audible and visual, and begins to log the event. 

With this, steps can quickly be taken by the crew to address the situation and return the vessel to its required level of efficiency.

With type approval by the major classification societies, you are assured of the operational safety and security. The VAF ShaPoLi data logging box SDB-3 and Bridge Panel PC SBP-3 are standardised solutions that comply with the strict EEXI regulations and are recognised by the PSC.

√ Safest solution
√ No interference with the engine control system
√ Allows for instant use of power reserve by the crew on the bridge
√ Engine independent “One size fits all” solution
√ Can be installed before the EEXI limit is known
√ Drives CO2 reduction and CII improvements
√ MEPC.335(76) and IACS Rec 172 compliant



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