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Container Stowage Plan affecting hull strength & stability of ship - Visibility from Bridge

Visibility from Navigation Bridge must conform with the IMO requirements and additionally to special requirements like those for Panama Canal etc as applicable. Reducing the vessels Trim or alternatively changing the Deck Cargo Stowage may be required to reduce the blind sector to within limits.

Extract from SOLAS 1974 (as amended) Ch V Regulation 22 Navigation bridge visibility :

1) Ships of not less than 45 m in length, as defined in regulation III/3.12, constructed on or after 1 July 1998, shall meet the following requirements:

.1 The view of the sea surface from the conning position shall not be obscured by more than two ship lengths, or 500 m, whichever is less, forward of the bow to 108 on either side under all conditions of draught, trim and deck cargo;

.2 No blind sector, caused by cargo, cargo gear or other obstructions outside of the wheelhouse forward of the beam which obstructs the view of the sea surface as seen from the conning position, shall exceed 108. The total arc of blind sectors shall not exceed 208. The clear sectors between blind sectors shall be at least 58. However, in the view described in .1, each individual blind sector shall not exceed 58;

.3 The horizontal field of vision from the conning position shall extend over an arc of not less than 2258, that is from right ahead to not less than 22.58 abaft the beam on either side of the ship;

.4 From each bridge wing, the horizontal field of vision shall extend over an arc of at least 2258, that is from at least 458 on the opposite bow through right ahead and then from right ahead to right astern through 1808 on the same side of the ship;

.5 From the main steering position, the horizontal field of vision shall extend over an arc from right ahead to at least 608 on each side of the ship;

.6 The ship’s side shall be visible from the bridge wing;

.7 The height of the lower edge of the navigation bridge front windows above the bridge deck shall be kept as low as possible. In no case shall the lower edge present an obstruction to the forward view as described in this regulation;

.8 The upper edge of the navigation bridge front windows shall allow a forward view of the horizon, for a person with a height of eye of 1,800 mm above the bridge deck at the conning position, when the ship is pitching in heavy seas. The Administration, if satisfied that a 1,800 mm height of eye is unreasonable and impractical, may allow reduction of the height of eye but not to less than 1,600 mm;

.9 Windows shall meet the following requirements:

.9.1 To help avoid reflections, the bridge front windows shall be inclined fromthe vertical plane top out, at an angle of not less than 10 8 and not more than 25 8 ;

.9.2 Framing between navigation bridge windows shall be kept to a minimum and not be installed immediately forward of any work station;

.9.3 Polarized and tinted windows shall not be fitted;

.9.4 A clear view through at least two of the navigation bridge front windows and, depending on the bridge configuration, an additional number of clear-view windows shall be provided at all times, regardless of weather conditions.

2) Ships constructed before 1 July 1998 shall, where practicable, meet the requirements of paragraphs 1.1 and 1.2. However, structural alterations or additional equipment need not be required.

3) On ships of unconventional design which, in the opinion of the Administration, cannot comply with this regulation, arrangements shall be provided to achieve a level of visibility that is as near as practical to that prescribed in this regulation.





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Draft, Trim and Heel affecting Hull Strength and Stability of containership

IMO Intact Stability Criterion for containership

Corrected GoM for Hull Strength and Stability of containership

Severe Wind and Rolling criterion affecting Hull Strength and Stability of containership

Propeller immersion affecting navigation of containership

Shearing forces, Bending moments and Torsional moment affecting Hull Strength and Stability of containership

Other factors affecting Hull Strength and Stability as necessary




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