46 CFR §98.30-18

1. (a)The operator or agent of each vessel must designate the person in charge of a transfer of liquid cargo in bulk to or from a portable tank or IBC.
2. (b)Each person designated as person in charge of a transfer of liquid cargo in bulk to or from a portable tank or IBC must—
   1. (1)On a tank barge, hold a “Tankerman-PIC”, restricted “Tankerman-PIC”, “Tankerman-PIC (Barge)”, or restricted “Tankerman-PIC (Barge)” endorsement on his or her merchant mariner credential or merchant mariner's document authorizing transfer of the classification of cargo involved;
   2. (2)On a self-propelled tank vessel, or on a tankship, carrying oil or hazardous material in bulk, hold a valid merchant mariner credential, license, or certificate authorizing service as a master, mate, pilot, engineer, or operator aboard that vessel, and a Tankerman-PIC or a restricted Tankerman (PIC) endorsement.