Large oil tankers often call at this port.
タンカー is the common loanword for an oil/liquid cargo ship, while 油送船 is the more formal, technical Japanese term for the same kind of vessel.
Standard kanji spelling for an oil tanker.
Alternate kanji spelling; 槽 means 'tank' or 'vat'.
Compound of 油 (oil), 送 (send, transport), and 船 (ship).