Class 4 (4th Engineer) SC&S 📅 Oct 2022

Exam Question

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

Reference Answer

### 1. Introduction
The double bottom structure in the machinery space serves multiple critical functions: providing longitudinal and transverse strength to the hull girder, forming a secondary barrier against flooding in case of bottom plating damage, creating tankage for fuel oil, lubricating oil, and fresh water, and most importantly, establishing a rigid and robust foundation for the main propulsion machinery and other heavy equipment.
### 2. General Arrangement of Tank Top & Double Bottom in Machinery Space
The construction in the machinery space is significantly more robust compared to other areas of the ship due to the high concentration of static and dynamic loads.

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