Class 4 (4th Engineer) MEKG 📅 Feb 2023

Exam Question

(a) Explain the role of hatch covers in dry cargo vessels and mention the types of mechanically operated hatch covers (5)

(b) Sketch and describe the operation of hatch cover of single pull type Macgregor design, front rolling type (7)

Reference Answer

### (a) Role of Hatch Covers and Types
**(i) Role of Hatch Covers in Dry Cargo Vessels**
As a critical component of a vessel's structure and cargo system, hatch covers serve multiple essential roles:
1. **Weather-Tight Integrity:** The primary and most crucial function is to prevent the ingress of water (seawater, rain, spray) into the cargo holds. This protects the cargo from damage, spoilage, and contamination. Maintaining this integrity is vital for the safety of the vessel, as it prevents the development of free surface effect in the holds which could severely compromise stability.

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