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Tank cleaning It is customary to clean the cargo tanks as a preparation to load the next cargo after the cargo is discharged and the tanker sails out from the discharge port. This is done because the next cargo may not be compatible with the earlier cargo or the vessels cargo tanks may have to…
Types of Valves You have by now understood the functions of a valve. These act as controls and allow or stop flow of any material. In the study of these valves, it is necessary to understand: The mechanism which controls the flow, Operation of the mechanism, Maintenance needs, Common problems that are normally experienced in…
METHODS OF CONTROL Before any cargo operations are carried out it is essential that cargo tanks be thoroughly inspected for cleanliness; that all loose objects are removed; and that all fittings are properly secured. In addition, any free water must be removed. Once this inspection has been completed, the cargo tank should be securely closed…
A cargo pump is a machine used to propel the liquid cargo from the tank into a pipe so that it may reach the shore tank (be discharged). We have learnt in our school days that the atmosphere can support a column of 10.336 m of fresh water (i.e. water of density 1.0000 kg/cm2). This…
Oil cargoes, like any other substance, can be measured in volume or weight. The volume will vary with temperature and hence it should be expressed in standard units so that a comparative study can be made. Temperature is measured in degrees Fahrenheit or degrees centigrade. The standard temperature used for all cargo calculations is 15º…