Category: Through the lens
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Bulk Carriers Losses-1 (The problems)
General Constructional Features Maximum utilization of space is generally ensured easily. The cargo’s SF (about 0.3 for ore & about 1.7 for grain) is the key factor. The overall cargo weight is the limiting factor in the design of an ore carrier, since the cargo is so dense. Coal, Grain, Rock Phosphate, wood chips, etc…
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Wire Ropes
Wire RopesSteel wires for wire ropes are made of non-alloy carbon steel. They possess high strength to enable the ropes withstand large tensile forces. Construction of a wire ropeStranded ropesIn case of stranded ropes several strands laid helically around a core. This core can be: Fiber core, generally made up of natural fibers like sisal.…
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CSS Code-2(Voluminous Cargoes other than Containers)
Annex 2 of CSS Code deals with safe stowage and securing of portable tanks.Annex 3 deals with the safe stowage and securing of portable receptacles.Annex 4 is about safe stowage and securing of wheel-based (rolling) cargoes.Annex 5 deals with the safe stowage and securing of heavy cargo items such as locomotives, transformers, etc.Annex 10 is…
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CSS Code-1 (General Idea and loading of Container on deck)
Securing of goods in most cases is undertaken by the stevedores. Though, they have a good work experience but the securing always needs a cross check by a certified officer. The utility of a lashing unit must be checked carefully. A ship in rough seas experiences combination of longitudinal, vertical and predominantly transverse motions. These…
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Timber Cargo-3 (Stability related issues)
Loading of timber on deck can cause problems like top heaviness due wrongly declared eights, extra ordinary absorption, use of bunkers from DBs, etc. Collapse of deck load; angle of loll; movement of logs in heavy seas; etc are the situations of impaired stability. In many sheltered passages often the barges are loaded in stability-wise…
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Light Derricks on a General Cargo Vessel
Most general cargo ships have union purchase installed onboard for cargo operations. It is also called married gear, span and tackle or twin gear system. The core principle, to find tension on hauling part being the vector addition of forces (Parallelogram Law or Lami’s Theorem). Out of the two tips of derrick booms, one is…
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Making the Cargo Plan (Multipurpose cargo ship)
A ship’s cargo plan shows the distribution and other details such as load / discharge ports; the quantities of different parcels onboard; and information that will help stevedore, plan the discharge of cargo. Planning the stowage on a multipurpose cargo ship is very challenging. There can be several permutations of stow. A loading list is…
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Timber Cargo-2 (Calculations)
Rolling of a ship imparts tremendous accelerations on the cargo that is loaded on it. This is made worse if the object is heavy and gains momentum due the play available by the virtue of the kind of stow. With timber all the above stated factors join hands and can cause a dangerous situation in…
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Timber Cargo-1 (General)
Way back in 1980, when I saw a cargo ship carrying timber leaned over a wharf in Kolkata, it made just an exciting news to share. Today however, I understand what the Master must have gone through. Timber cargo gives you an additional element of risk. It is very important to understand the dangers involved…
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Chain Register
Chain register has nothing to do with the anchor chain. It is however, a very useful document, which must be kept valid if ship’s cargo gear has to be used. Thus, it is a register of periodical test and examination and certificates thereof. It deals with lifting gear such as derricks, cranes or hoists, winches…