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What is Document of Authorisation?
What is Document of Authorisation ? The Document of Authorisation certified that the ship has been provided with the information necessary for it to comply with the requirements of the…
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Explain the Explosimeter?
Explain the Explosimeter? Explosimeter or combustible gas indicator is used for the detection and measurement of combustible gases and vapour. It depends for its operation on the heat developed by…
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Explain & draw the types of pipping systems on Tankers?
TYPES OF CARGO PIPELINE SYSTEMS Tankers have a varied pipeline system which is basically based on three main types: The Free Flow System This system is mainly used on large…
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Name and describe the different types of sweat on vessel?
The 3 types of sweat on vessels Atmospheric sweat: A hold contains a very large volume of air. Any air brought in by ventilators at any instant is very small…
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What is the purpose of Ventilation? When do you Ventilate a cargo hold during voyage?
Purpose of Cargo hold Ventilation 1. Prevention of cargo or ship sweat.2. Removal of taint or smell of previous cargo3. Prevention of build-up dangerous gases4. Supply of fresh air to…
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Name and describe 3 methods of Gas Freeing of cargo tanks ?
METHODS OF GAS FREEING TANKS Tanks must be gas-freed before man entry or hot work is carried out.Inert gas, air or steam is used to replace the tank atmosphere. Using…
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What is Spot Check & How is it done?
SPOT CHECK ON BOARD The spot check is done on Bulk carrier vessels to determine Angle of Repose. Method: Place a rough sheet of paper (e.g.sand paper) on a horizontal…
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Define Surface Ventilation and Through Ventilation?
Define Surface Ventilation and Through Ventilation Ventilation can be carried out in two ways-through and surface ventilation. In through ventilation air is passed over the entire area of the hold…
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What precautions will you take when Loading Bulk cargo?
PRECAUTIONS TO TAKE WHEN LOADING BULK CARGO : 1. Inspect the hold for suitability prior loading. 2. Ensure that bilge wells, strainer plates, sounding pipes, bilge suctions etc. are tested…
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When is a mixture called "Too Lean" & "Too Rich" ? What is "Flammable Range" of a mixture?
What are Too Rich and Too Lean mixtures Too Lean If the % of CH vapour is too low the mixture will not ignite and is said to be "too…