DNV’sHull Structure course for

World Wide Shipping

5 - Hull Structure – cargo areaIntroduction

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Contents

1. Introduction

2. Hull structural breakdown – function of hull elements:

• Side

• Bottom

• Deck

• Longitudinal bulkhead

• Transverse bulkhead

• Web frames

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Characteristics for Oil tankers Any proposals?

- High number of tanks – good capability of survival - Low freeboard, green seas on deck- Pollution / public attention / fire explosion hazards - Fatigue - Liquid cargo – sloshing in wide tanks and stability aspect - Fully utilizes BM limits hogging/sagging (double hull tankers)

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Single Skin Oil Tanker

- Build up to 1993

Ship data:L = 310mB = 56m

D = 31,4m284,497 DWT

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Single bottom with side ballast tanks

- Built in the 80’s’

Ship data:L = 236mB = 42m

D = 19,2m88,950 DWT

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Double Hull – Two Longitudinal Bulkheads

- Common VLCC design of today

Ship data:L = 320mB = 58m

D = 26,8m298,731 DWT

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Double Hull – CL Longitudinal Bulkhead

- Common Aframax and Suezmax design of today

Ship data:L = 264mB = 48m

D = 23,2m159,681 DWT

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Double Hull – no CL bulkhead

- Older design

Ship data:L = 218mB = 32,2mD = 19,7m

63,765 DWT

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Structural breakdown of hull

-A vessel’s hull can be divided into different hull structuralelements

- Each element has its own function contributing to the integrityof the hull

- In order to assess the structure of an oil tanker, one needs to understand the function of each structural element

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Hull Structural Breakdown

1. SideBottomDeck

Transverse bulkheadLongitudinal bulkheadWeb frames

2.

3.

4.

5.

6.

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Questions ?