Class 1 (Chief Engineer) Engineering Management 📅 Oct 2024

Exam Question

IMO has introduced the EEXI requirements under MARPOL Annex VI Chapter IV for existing vessels from 2023 as a measure towards reduction of CO2 emissions from shipping.

(a) Explain the various design features adopted in the existing vessels to comply with the present EEXI which meets the EEXI framework under Phase 2 (of 20% - 30% reduction). (8)

(b) Explain the concept of CII rating and critically discuss the role of measuring metrics of AER and EEOI. What are the measures required to be taken by the vessel to improve its CII ratings (8)

Reference Answer

### (a) Design Features for EEXI Compliance
The Energy Efficiency Existing Ship Index (EEXI) is a technical measure mandated by IMO to improve the energy efficiency of existing ships. To comply with the EEXI framework, particularly under Phase 2 which targets a 20-30% reduction in CO2 emissions, several design features and modifications can be adopted. These measures focus on limiting the main engine power to reduce fuel consumption and emissions.
1. **Engine Power Limitation (EPL)**
* **Concept**: EPL is a system that limits the maximum engine power by adjusting the fuel index limiter on the engine's control system. This is a semi-permanent, tamper-proof method to ensure the vessel operates within a more efficient, lower-power range.

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