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CHEMCO Exit Exam • Set 7 Question 3 of 30

Typical Locations for High Sensitivity to Fatigue Failure The following areas are considered to be prone to fatigue failure on double hull oil tankers: which one is the most common

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Direct Answer

Option A: Side shell area below the load and ballast waterlines. These areas are subjected to the highest cycle loading through the ship’s life due to the passage of waves along the side of the ship.

The side shell areas below the load and ballast waterlines experience the highest cyclic stress due to wave action. This constant flexing makes them particularly susceptible to fatigue crack initiation and propagation over the vessel's service life, as detailed in structural analysis principles.

All Options

A
Side shell area below the load and ballast waterlines. These areas are subjected to the highest cycle loading through the ship’s life due to the passage of waves along the side of the ship. (Correct Answer)
B
Deck plating at connection to primary supporting members.
C
Connection between transverse bulkheads to the upper and lower bulkhead stools.
D
Connection between lower hopper sloping plating and inner bottom plating.

Detailed Explanation & Context

The side shell areas below the load and ballast waterlines experience the highest cyclic stress due to wave action. This constant flexing makes them particularly susceptible to fatigue crack initiation and propagation over the vessel's service life, as detailed in structural analysis principles.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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