STS mooring operations during the hours of darkness, and during reduced visibility are not recommended and strongly discouraged for safety reasons.
Unberthing operations are permitted during darkness, subject to the Master’s discretion, and in consultation with the head office, whenever in doubt.
For vessels carrying out STS operations in the Gulf of Mexico, the STS mooring and unmooring operation is permitted to be carried out at any time of the day, without tugs, weather permitting, and in consultation with the office whenever in doubt.
If the length overall of a vessel or barge coming alongside own vessel exceeds 100m, it should be considered an STS operation.
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