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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….
A large variety of cargoes carried in containers today – everything from ice cream to New Zealand lamb, from avocados to flower bulbs, from melons to fish – all require different specialist refrigerated care. Considering the high cost of most reefer cargoes it is important that each cargo is carried exactly according to its requirements….
Containers of various sizes are used in the industry and we shall now understand how they are utilised for cargoes of various sizes and types. Size of containers The standard containers consist of the following size: – Hi-cube containers have the dimensions of 20’/40’x8’00”x9’00”or9’06”. In addition you will find 35 ft, 45ft and 52 ft…
On a general cargo vessel the identification of the location of a parcel of cargo was a simple process. Since the vessel was divided into holds, the first parameter was the hold. Each hold was divided into lower hold and tween decks hence the next parameter was either lower hold or tween dk. Each of…
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The Gauging system Most of the terminals these days demand that a closed gauging / sampling system be followed on all tankers at their terminals. This means that the tanker must be able to gauge or sample the cargo in her tanks manually or automatically without opening her cargo tanks to the atmosphere. In this…
Containers A standard container is basically a rectangular box with 5 sides closed and the sixth being the door. A box can be constructed in many ways, two most commonly used methods are: (a) Construction using same material throughout & (b) Using a frame and attaching varying materials to the frame. The example…
INDEPENDENT TANKS These types of tanks are completely self-supporting and do not form part of the ship’s hull and do not contribute to the hull strength. Depending mainly on design pressure, there are three different types of independent tanks for gas carriers, Types A, B and C MARVS: – Maximum Allowable Relief Valve setting on…
The circumstances of a substantial claim recently settled by the Club in respect to cargo contamination and shortage clearly underline the fact that some masters do not understand that the suitability of cargo spaces for the intended cargo is their responsibility and theirs alone. Inadequate Cleaning of Cargo Tanks In this instance, the ship had…