Loading the cargo tanks, Discharging of parcel cargoes, Discharging of homogeneous cargoes (parallel pumping), Cargo heating by deck mounted heaters, Stripping, Tank cleaning.
1.0 LOADING THE CARGO TANKS
Correct operation of pumps and valves is essential to avoid pressure surges in a cargo
pipeline system during loading. Pressure surges may cause severe damage to the pipeline, hoses, metal arms and cargo pumps. Pressure surges will be excessive if a valve is closed too quickly and especially where long pipelines and high fl ow rates are involved.
Note: If a seperate drop line is installed, we recommend to load through the drop line only.
lf this is not possible due to valve arrangement, use following procedures to avoid pressure peaks in the cargo piping during loading.
1.1 Procedure for loading through the drop line and cargo pump
1. 1.2 Keep manifold valve closed until the cargo reach the manifold.
1. 1.3 Open the manifold valve partly to fi ll cargo line on deck.
1.1.4 ** Open the cargo pump discharge valve and drop line valve slowly, until you reach maximum capacity, or maximum 8 bar cargo pressure, measured at the top of the
pump. For minimum opening time, see table on page 4.
1.1.5 Continue to load through the drop line and the cargo pump.
1.2 Procedure for loading through the cargo pump without drop line
1.2.1 Keep manifold valve partly closed until the cargo reach the manifold.
1.2.2 Open manifold valve partly, to fi ll cargo line on deck.
1.2.3 ** Open cargo pump discharge valve slowly. For minimum opening time, see table on page 4.
1.2.4 ** Open the manifold valve slowly until you reach maximum capacity, or maximum 8 bar cargo pressure, measured at the top of the pump. For minimum opening time, see table on page 4.
1.2.5 Continue to load through the cargo pump.
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