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Module 2A: Hull Structure

Scope

SCOPE OF TRAINING

The participant who has completed the module will be able to understand:

  • Longitudinal strength;
  • Local scantlings such as plates and stiffeners;
  • Structural stress, fatigue and buckling analyses; and
  • Materials, welding and other pertinent methods of material-joining, for compliance with relevant rules and convention requirements pertaining to design, construction and safety.

EVALUATION CRITERIA AND PASS REQUIREMENTS

The assessment methods will be to choose the best answer from a selection of alternatives.

In the method of objective evaluation, only be accepted one correct answer is valid, and never more than one selection within the same question since they will be automatically considered incorrect.  The participants approve the course with a score equal to or greater than 70% of the total value of the assessment. All evaluations will be based on a Total Score of 100.

MODULE 2A-Hull Structure

PO02-TI04 Propeller shaft survey (Ver. 01, 05-2020)

PO02-TI03 Dry dock survey (Ver. 01, 05-2020)

General Regulations for Supervision ( Rev 2020)

ICS Class Rules-Chapter 1-Classification (Rev 2020)

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ICS Class Rules-Chapter 3-Equipment, Arrangement and Outfit (Rev.2020)

ICS Class Rules-Chapter 13-Materials ( Rev.2020)

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Exam Questions

1. Similar stage of construction means the stage of a ship at which:

2. The expression ships constructed means ships the keels of which are laid or which are at a similar stage of construction

3. The expression alterations and modifications of a major character means, in the context of cargo ship subdivision and stability, any modification to the construction which affects the level of subdivision of that ship.

4. The Administration of a State may, if it considers that the sheltered nature and conditions of the voyage are such as to render the application of any specific requirements of the Chapter II-1 of SOLAS Convention is unreasonable or unnecessary, exempt from those requirements individual ships or classes of ships entitled to fly the flag of that State which, in the course of their voyage, do not proceed more than 20 miles from the nearest land.

5. Ships shall be designed, constructed and maintained in compliance with the structural, mechanical and electrical requirements of a classification society which is recognized by the Administration

6. Longitudinal strength calculations are to be carried out for all ships where L is greater than 65 m, covering the range of load and ballast conditions proposed, in order to determine the required hull girder strength. The calculations of still water shear forces and bending moments are to cover both departure and arrival conditions and any special mid-voyage conditions caused by changes in ballast distribution.

7. In general, where a long superstructure or deckhouse of length greater than 0,15L is fitted, extending within the 0,5L amidships, the requirements for longitudinal strength in the hull and erection will be considered in each case.

8. In order that an assessment of the longitudinal strength requirements can be made, the following information is to be submitted for revision and approval, where appropriate.

9. A Loading Manual is to be supplied to all ships where longitudinal strength calculations have been required. The Manual is to be submitted for revision and approval in respect of strength aspects. Where both Loading Manual and Loading Instrument are supplied, the Loading Manual must nevertheless be approved from the strength aspect. In this case, the Manual is to be endorsed to the effect that any departures from these conditions in service are to be arranged on the basis of the Loading Instrument

10. Considerations to be taken into account when looking for and dealing with damage:

11. The fatigue can be defined as a failure under alternated or cyclic loads or the crack propagation through a component due to a system of loads of cyclic nature. The fatigue stages are recognized as follow:

12. The solution to deal with damages caused by fatigue is to decrease the stresses in the area, for instance:

13. Corrosion under stresses: This effect consists in the acceleration of the corrosion in areas subject to higher stresses than on the surrounding area.

14. The decrease of the thickness due to corrosion causes, in turn increase the stresses, that is: More corrosion=More stress and More stress=More corrosion

15. The progress of the corrosion depends on many factors as such:

16. Humidity and Heat contribute for an acceleration of the corrosion. For this reason, in tanks or areas where those factors exist, there will be a greater possibility to find accelerated corrosion and wear. In general, affects more the tanks above the floating line:

17. The solution to prevent damages caused by Humidity and Heat is the adequate maintenance of the coating.

18. The stress concentration generally occurs, due to Geometrical discontinuity,for example:

19. All materials are to be supplied with appropriate certification, as required by the relevant requirements of Chapter 13 of the ICS Class Rules. This will normally be a certificate issued by a manufacturer or certificate validated by other class society, although a manufacturer's certificate may be accepted where allowed by the relevant requirements of ICS Class Rules.

20. The supervision of materials, carried out by ICS Class, is to be composed of the following:

21. Welding charts included the following information according to Chapter 14 of the ICS Class Rules:

22. The welder approval test shall be an important requirement for the welding operations under surveillance of ICS Class. The steel welder approval test shall be carried out in accordance with the special attention of ICS Class. The Certificate of approval test for welders is a mandatory requirement of ICS Class.