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Published Date

January 1982


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Drift Characteristics of 50,000 to 70,000 DWT Tankers

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This publication provides drift characteristics of tankers in the 50,000 to 70,000 dwt range.

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Following investigations into drift characteristics, it was discovered that results obtained for VLCCs were not necessarily indicative of the behaviour of smaller vessels. Concern was expressed by the American Institute of Merchant Shipping (AIMS) for the need to include within the scope of the studies details for vessels of the 50,000 to 70,000 dwt range, particularly in view of the present numbers of these ships.

 

Computer programs were developed by the National Maritime Institute (NMI) to assess drift behaviour of these ships, which required validation. Some free model experiments were carried out to investigate wave drift forces and also to determine the accuracy of results obtained.

 

The Oil Companies International Marine Forum (OCIMF) and the NMI worked together upon the project to estimate the effects of wind, waves and current upon the drift track, heading and speed of such vessels under a variety of conditions.

 

The Appendix to the study contains some 28 of the 72 runs, being representative of the whole series or effects obtained.

1. Introduction

2. Conduct of the Study

3. Model Experiments

3.1 The Ship Module

3.2 The Experiments

3.3 Results Obtained

3.4 Discussion of Results

4. Validation of Computer Prediction

5. Predictions of Drift

5.1 General

5.2 Drift Estimation Curves

5.3 Effect of Latitude

5.4 Effect of Ship Size

6. General Discussion

7. Conclusion

8. References

9. Nomenclature

Appendix

OCIMF was formed in April 1970 in response to the growing public concern about marine pollution, particularly by oil, after the Torrey Canyon incident in 1967. In the early 1970s, a variety of anti-pollution initiatives were starting to emerge nationally, regionally and internationally, but with little coordination. Through OCIMF, the oil industry was able to play a stronger, coordinating role in response to these initiatives, making its professional expertise widely available through cooperation with governments and intergovernmental bodies.

OCIMF was granted consultative status at the IMO in 1971 and continues to present oil industry views at IMO meetings. Since then, its role has broadened to take account the changing maritime activities of its membership. Its remit now covers tankers, barges, offshore support vessels and terminals and its advice extends to issues like shipping in ice and large-scale piracy, which rarely troubled the oil industry when OCIMF was first created in the 1970s.

The current membership of OCIMF comprises 112 companies worldwide.

Today, OCIMF is widely recognised as the voice of the oil industry providing expertise in the safe and environmentally responsible transport and handling of hydrocarbons in ships and terminals and setting standards for continuous improvement. Membership is extensive and includes every oil major in the world along with the majority of National Oil Companies.

OCIMF has much to be proud of. Not only has it contributed to a substantial quantity of regulation at the IMO aimed at improving the safety of tankers and protecting the environment, but it has introduced important new guidance on pressing current issues such as piracy and Arctic shipping. With the process of introducing new Internationally-accepted regulation necessarily slow as it crosses many individual countries and jurisdictions, OCIMF is in the unique position of being able to leverage the expertise of its membership to press ahead with much needed guidance on important industry issues. This provides the means to improve practices in the membership and in the wider industry, and serves as a valuable reference for developing regulation.

Title: Drift Characteristics of 50,000 to 70,000 DWT Tankers
Number of Pages: 100
Product Code: 4400W010
ISBN: ISBN 13: 978-0-900886-67-6 (9780900886676), ISBN 10: 0-900886-67-6 (0900886676)
Published Date: January 1982
Binding Format: Paperback
Book Height: 290 mm
Book Width: 205 mm
Book Spine: 7 mm
Weight: 0.40 kg
Author: Oil Companies International Marine Forum

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