Introduction to List and Trim in Ship Stability
The free online course on the calculation of the list and trim, as well as the concepts of permeability and bilging.
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Introduction to list and trim is a free online course that begins by introducing you to the illustration, construction, and interpretation of the curve of statical stability. This course will also introduce you to the use of the curve of intact statical stability to determine stability data. You will also learn about the range of stability at different angles of the heel. This course will teach you about the concepts of centre of gravity, list, heel, and the transverse shift of B. You will learn about the righting lever and righting moment. The shift in the centre of gravity due to removing, adding, and shifting a single weight will be covered in this course. This course will introduce you to the vertical shift of the centre of gravity due to several weights. This course will teach you how to determine the list in case of loading and discharging of cargo. The concepts of metacentre, as well as the need for a sufficient metacentric height for passenger ships, will also be covered in this course. You will learn about the derivation of the formula for the list, along with the internal and external factors that influence the stability of the ship.
This course then explains the concepts and differences between stiff and tender vessels. You will learn about the stability of vessels with a deck cargo of timber. This course will teach you about the working principles of the free surface effect. You will learn about the formulas for a rectangular waterplane area with the second moment of the area around the centerline, free surface correction, and free surface moment. You will also learn about the calculation of the free surface correction due to slack tanks. This course also explains the three methods used in controlling the free surface effect. This course will also teach you about the concepts of trim and the three methods of changing the trim. The course will teach you about moving masses already on board forward or aft. The course will explain adding or removing masses at a position forward or aft of the centre of floatation. This course will then teach you how to find the position of the centre of floatation using hydrostatic data. You will also learn about the relationship between the pitch and the centre of gravity. The difference between the trim and the list will also be covered in this course.
Furthermore, this course will help you get familiar with the calculation of change of draft forward and aft. You will learn about the Moment to Change Trim (MCTI). This course will also teach you about the division of trim problems into type A and type B. This course will teach you about the concepts of bilging, as well as the four ways in which bilging can occur. You will also learn about the bilging of the midship, intermediate side, and end compartment. You will also learn about the list due to the bilging of the side compartment. You will also be familiar with the concepts of permeability and permeability of various compartments. This course will also teach you about intact stability requirements and SOLAS general requirements. The importance of the damage control plan and damage stability booklet will also be covered in this course. You will then learn about the effect of flooding and corrective actions to take, and the concepts of dewatering. The functions and operations of hydraulically operated watertight doors will also be covered in this course. This course will help you get familiar with the cross-flooding arrangement. This free online course will be of great interest to students, researchers, and anyone with an interest in list and trim in ship stability. So, register for this course and start your next learning journey today.Start Course Now
Metacenter and Free Surface Effects
Metacentre and Free Surface Effects - Learning Outcomes
Curves and Cross Curves of Statical Stability
Movement of Center of Gravity
List and Vessels
Free Surface Effects
Metacentre and Free Surface Effects - Lesson Summary
Trim and Bilging
Trim and Bilging - Learning Outcomes
Moment of Change Trim
Bilging and Permeability
Intact Stability Requirements
Dewatering and Cross Flooding Arrangement
Trim and Bilging - Lesson Summary
Upon the successful completion of this course, you should be able to:
- Evaluate the curve of intact statical stability to determine stability data.
- Describe the effects on stability by the movement of weights.
- Evaluate the concept of metacenter and its importance for ship stability.
- Describe the effect of loading and discharging on CG and stability.
- State the formula used to calculate the list.
- Explain the effect of slack tanks on stability.
- Explain the longitudinal stability terms and the effects of trim on ship stability.
- Outline the intact stability requirements for a ship.
- Explain the bilging of compartments and their effects on stability.
- Evaluate the dewatering process that will be necessary in case of a hull breach.
- Outline the importance of closing watertight doors under the partial loss of buoyancy
- Explain cross-flooding arrangement.
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