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CHEMCO Exit Exam • Set 13 Question 6 of 30

Which tanker discharge pattern would be the safest and most efficient?

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Direct Answer

Option B: Start discharging with most of the discharge coming from forward, but include some from midships and after tanks

Discharging with most flow from forward, supplemented by midships and aft, maintains a slight stern trim. This ensures efficient drainage towards the suctions, minimizes sloshing, and helps manage hull stresses, as detailed in ISGOTT and ship-specific cargo plans.

All Options

A
Empty the forward tanks and start working aft, emptying each tank in sequence
B
Start discharging with most of the discharge coming from forward, but include some from midships and after tanks (Correct Answer)
C
Start pumping from forward, midships, and aft with the discharge distributed equally among the tanks
D
Start pumping from midships and then work forward and aft simultaneously as the midships tank is emptied

Detailed Explanation & Context

Discharging with most flow from forward, supplemented by midships and aft, maintains a slight stern trim. This ensures efficient drainage towards the suctions, minimizes sloshing, and helps manage hull stresses, as detailed in ISGOTT and ship-specific cargo plans.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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