Class 4 (4th Engineer) SC&S 📅 Mar 2023

Exam Question

Describe the arrangement of tank top and double bottom in the machinery space making particular reference to the structure and scantling below the main engine. Show the method adopted in the arrangement of DB tanks to avoid contamination of fresh water, fuel oil and lube oil stored in DB tanks (16)

Reference Answer

### Introduction
The double bottom in the machinery space is a critical structural element that serves multiple purposes: providing longitudinal and transverse strength to the hull girder, forming an integral part of the ship's safety structure (double hull), creating tank capacity for various machinery liquids, and forming a rigid foundation for heavy machinery, most importantly the main propulsion engine.
### 1. Arrangement of Tank Top & Double Bottom in Machinery Space
The construction in the machinery space is significantly more robust compared to other areas like cargo holds, due to the high concentration of static and dynamic loads and the need for absolute structural rigidity.

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