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Bitumen is a mixture of organic liquids that are highly viscous, black, sticky, entirely soluble in carbon disulphide, and composed primarily of highly condensed polycyclic aromatic hydrocarbons. Bitumen is the residual (bottom) fraction obtained by fractional distillation of crude oil. It has a specific gravity range between 1.00 to 1.04 and average volatility. It is…
Records of the operations done with noxious liquids are to be maintained to provide evidence of the processes that were followed to ensure that no pollution was caused. MARPOL 73 / 78, annex II deals with noxious liquids carried in bulk. The student is advised to keep a copy of MARPOL handy while studying the…
•Timber – means sawn wood or lumber, cants, logs, poles, pulpwood and all other types of timber in loose packaged forms but not including wood pulp or similar cargo. •Cant – means a log that is cut in slabs, so that two opposite or sometimes three sides are flat and the other(s) curved. •Timber Deck…
System as per my present vessel The automatic cargo stripping system is provided to improve the efficiency of stripping the cargo oil tanks and to assist in the maintenance of high bulk rate discharge. It utilises the cargo oil pumps to complete the stripping operation which reduces unloading time. The operation is fully automated. The…
System described basis my present vessel FULL DISCHARGE The following factors are to be considered prior to a full discharge: • Maximum available draught at the berth • Maximum allowable freeboard on the berth • Grade segregation, if carrying multiple grades • Crude oil washing requirements • Heavy weather ballast requirements • Maintenance of satisfactory…
Below loading is explained basis my present vessel. See the diagram for better understanding. The cargo oil tanks are divided into three segregations or groups which can be used either individually or combined to permit the loading of the nominated quantities. Group 1 consists of No.1, No.4 COTs and the starboard slop tank Group 2…
System explained basis my present vessel Cargo oil tanks are crude oil washed to comply with both legislation (contingency ballast requirements) and charterer’s requirements in order to achieve maximum out-turn. This would usually be No.4 COT port and starboard (nominated heavy weather ballast tanks) and one quarter of the remainder. However, no tank requires to…
System explained basis my present vessel. The deck mounted tank cleaning machines are turbine driven, fully programmable, single nozzle units. The nozzle performs a helical pattern by rotating in a horizontal plane, combined with a very slow vertical movement. The machine can rotate 360° in the horizontal plane and up to 135° in the vertical…
The stripping pump is a steam driven, double stroke, reciprocating type pump, controlled from the cargo console in the CCR. The stripping pump can be used to drain the cargo lines and the pump room bilges to the port or starboard slop tank, to shore via the 125mm line (MARPOL line), or if necessary to…
Normally on oil tankers the main cargo pump system consists of three vertical centrifugal single stage double suction type cargo pumps. They are situated at the bottom of the pump room and are driven by a single stage Curtis steam turbine and intermediate shaft passing into the pump room through a gas tight bulkhead gland….