We run a capt, 3-4 mates, 3-4 ABs( 2 of which are Tankerman), A Chief, 2 assistants and a cook. Capable of dirty or clean oil. Mates are the PIC and tankerman are assistants during cargo ops. The AB tankerman maintain the barge while at seas. Can usually run anywhere up to 20 foot seas before we call it for anchor time.