Class 1 (Chief Engineer) Engineering Management 📅 Jul 2023

Exam Question

Hull & Propeller maintenance is gaining popularity with the recent high stress on the energy efficiency of ships. Write short notes on the following:

(a) Hull Roughness Management. (6)

(b) Condition Based Propeller Maintenance (5)

Reference Answer

### (a) Hull Roughness Management (6 Marks)
**1. Objective:**
The primary objective of hull roughness management is to maintain the smoothest possible hull surface to minimize frictional resistance (drag) as the vessel moves through water. This directly enhances hydrodynamic efficiency, leading to significant reductions in fuel consumption and associated greenhouse gas (GHG) and pollutant emissions (CO2, SOx, NOx), which is critical for compliance with regulations like EEXI and CII.
A common industry metric suggests that for every 10-micron increase in Average Hull Roughness (AHR), a 1% increase in engine power is required to maintain the same speed.

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