MPRI Ship Analytics


Very Large Crude Carrier (VLCC)

Cargo System

The vessel is equipped with 18 main cargo tanks comprising of 12 wing tanks, 6 centre tanks together with two cargo slop tanks. Each tank is connected to one of four main cargo lines which in turn can be cross connected allowing flexibility in the setting up of the cargo system. The slop tanks can also be cross connected separately allowing closed cycle washing techniques to be used. The main cargo lines are connected via the pumproom to four cargo manifolds located on each side of the vessel.

VLCC Pumproom
VLCC Pumproom

Level indications together with high level alarms are provided on each cargo tank using a 'float gauge' type of monitoring system. This provides the facility for the level to be indicated both in sounding and ullage and for the gauge to be raised and housed when required. A water / oil interface detector is also provided for the slop tanks.

The vessel is designed to be able to carry up to two segregated cargoes. The model allows any grade of oil to be placed into the tanks. At run time the operator can choose the cargo required from a list of ten previously defined. This list can be adjusted as required. The model will handle the effects of both the mixing of different grades together with the introduction of water into the system

VLCC Cargo Tanks
Cargo Tank

Each cargo tank is also connected to a separate tank stripping system allowing tanks to be drained without affecting the main operation.

The main pumping system comprises of four steam turbine cargo pumps, two of which are fitted with a 'Primavac' style stripping assistance system. In addition the vessel has one steam reciprocating pump for stripping purposes together with two high capacity stripping eductors, each of which being capable of being connected to any of the cargo pumps.






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