What is IMO intact stability criteria?

Intact stability criteria – Analyzing the data of vessels that behaved well, and especially the data of vessels that did not survive adverse conditions, various researchers and regulatory authorities defined criteria for deciding if the stability of a vessel is satisfactory.

What are the different intact stability criteria?

Intact Stability Code The IS Code included fundamental principles such as general precautions against capsizing (criteria regarding metacentric height (GM) and righting lever (GZ)); weather criterion (severe wind and rolling criterion); effect of free surfaces and icing; and watertight integrity.

What is the intact stability?

First, Intact Stability. This field of study deals with the stability of a surface ship when the intactness of its hull is maintained, and no compartment or watertight tank is damaged or freely flooded by seawater.

What is the general intact stability criteria requirement on the area of the GZ curve?

The righting lever GZ should be at least 0.20 m at an angle of heel equal to or greater than 30°. The maximum righting arm should occur at an angle of heel preferably exceeding 30° but not less than 25°.

What is intact condition?

1 : untouched especially by anything that harms or diminishes : entire, uninjured. 2 of a living body or its parts : having no relevant component removed or destroyed: a : physically virginal. b : not castrated.

What is the minimum righting lever required by IMO intact stability criteria?

General intact stability criteria for all ships: The righting lever GZ should be at least 0.20 m at an angle of heel equal to or greater than 30°.

What are stability criteria?

In control theory, and especially stability theory, a stability criterion establishes when a system is stable. A number of stability criteria are in common use: Circle criterion. Jury stability criterion. Liénard–Chipart criterion.

What is intact stability code and intact stability requirements for the carriage of grain?

Grain Code:- Intact Stability & Securing of Grain Surface: a) The angle of heel due to the shift of grain shall not be greater than 12° or in the case of ships constructed on or after 1 January 1994 the angle at which the deck edge is immersed, whichever is the lesser.

When must a vessel comply the IMO intact stability criterion?

A ship is seaworthy if it fulfills two important stability criteria- Intact and Damage stability. Initial GM or metacentric height should not be less then 0.15 m. Righting lever GZ should be at least 0.2 m and angle of heel Ѳ ≥ 30̊. Maximum righting lever should occur at heel >30̊ preferably but not less than 25̊.

What is the purpose of Intact Stability Code?

The purpose of the Code on Intact Stability for All Types of Ships Covered by IMO Instruments, hereinafter referred to as the Code, is to recommend stability criteria and other measures for ensuring the safe operation of all ships to minimize the risk to such ships, to the personnel on board and to the environment.

What is the minimum metacentric height required by IMO intact stability criteria?

Minimum metacentric height should be 0.15 meter.

Why margin line is 76 mm below deck?

If the bulkhead deck submerges, openings on the top of the bulkhead deck which are not watertight may submerge and lead to progressive flooding. To achieve this aim and for a margin of safety a margin line is drawn at least 76mm below the bulkhead deck.