Class 1 (Chief Engineer) Engineering Management 📅 Feb 2023

Exam Question

(a) IMO has introduced the EEXI requirements under MARPOL Annex VI Chapter IV for existing vessels from 2023 as a measure towards recutionof CO2 emissions from shipping. Explain the various design features adopted in the existing vessels to comply with the present EEXI framework under Phase 2 (of 20% - 30% reduction)

(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 rating.

Reference Answer

### (a) Design Features for EEXI Compliance (Phase 2)
The Energy Efficiency Existing Ship Index (EEXI) is a technical measure requiring existing ships to meet a specific energy efficiency standard. To comply with the Phase 2 requirements (20% - 30% CO2 reduction from baseline), vessels can implement several design modifications and technical measures:
1. **Engine Power Limitation (EPL) / Shaft Power Limitation (SHaPoLi)**:
This is the most common and cost-effective method. It involves permanently limiting the engine's maximum power output to a level that meets the required EEXI.

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