Tankerman · Operations — Topping Off
When topping off cargo tanks at the end of loading, the transfer rate should be:
- AIncreased to finish faster
- BReduced so ullage can be watched closely and overflow avoided✓ Correct
- CHeld at maximum until the high-level alarm sounds
- DStopped only after the tank overflows
Explanation
Topping off at a reduced rate gives the PIC time to monitor ullage on each tank, shut valves in sequence, and stop before the maximum allowable fill is exceeded, preventing an overfill spill.
Authority: Tank Vessel Operations (33 CFR 156)
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