What is a Ship's Stern Tube? PART23

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Types of Ships. Part19

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Types of Ships Cargo ships are classified into various types on the basis of purpose, size, type of cargo etc. The economic factor is of prime importance in designing a merchant ship. Every owner wants maximum return on their investment which means a ships construction not only depends on the current economic necessities but the factor of future adaptability also plays a part. From the preliminary design of a vessel due for construction, the following information can be obtained: 1.      Dimensions 2.      Displacement 3.      Stability 4.      Propulsive characteristics and hull form 5.      Preliminary general arrangement 6.      Principal structural details A layout of the various ship types and their subdivisions will be listed out, covering a wide range of all vessels in operation.  The type of ship plays an important role in deciding the above mentioned parameters. Types of Ships Ships are mainly classified into the following types: 1. Container Ships 2. Bulk Carrier 3. Tanker Sh
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Black Smoke from the Funnel: What to do? PART24

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​ Black Smoke from the Funnel: What to do? Black Smoke from the funnel is a sign of poor maintenance and malfunction of the machinery. It is a serious issue as it violates Marpol 73/78 Annex VI and can lead to inspections and detention of the ship. In a ship with multiple machines the identification of the faulty unit is a difficult task. The reasons black smoke is wrong are:                                    1.       It indicates that shipkeeping and maintenance is not proper and up to the mark. 2.       It indicates the lack of competency of the engineers. 3.       It is polluting. 4.       It increases the risk of an uptake fire. Marpol Annex VI has set standards for air pollution and the sulphur content of the exhaust gases. Back smoke indicates that the combustion is incorrect. It suggests a bad fuel efficiency and an increase in the fuel consumption. Causes of Black Smoke The dark color of the smoke is caused by suspended fine carbon particles due to incomplete combustion taking
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Maintenance part17

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Maintenance Running checks should include: Gear box - oil level; inspect for leaks around casing; ensure pins and bolts in mechanical linkages are secure. Shaft bearings - check oil level in bearing sump; leakage through end seals; temperature of bearing. Stern gland - a leaking stern gland is a normal routine and is adjusted as a matter of course. See stern tubes in section above. Propeller shaft - check noise level to determine whether it is increasing. Regular maintenance schedules will include: Gearboxes - Adjust clutches and operating mechanism, clean filters and clean oil coolers. Drive train  Engine and shaft bearing moutings, loose shaft coupling bolts (perhaps due to mis-alignment) may need to be tightened. Mis-alignment of intermediate bearings will show up by overheating of the bearing. Survey servicing and repair schedules will include: Weardown survey- Allowance is determined by the manufacturer, but rules of thumb range from 3% of diameter as due for replacement to 6% bei
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