This paper highlights the Exxon Company, U.S.A's pollution prevention experience on oceangoing vessels. The Marine Department of this company is responsible for operating all of Exxon's U.S. flag tankers and inland waterways equipment. Exxon stresses environmental awareness and responsibility on the part of all Marine employees. The Load-on-top (LOT) ballast procedure is being used on tankers carrying both persistent and nonpersistent oil to minimize operational discharge. This procedure consists of taking on the required dirty ballast when leaving the discharge terminal. Since part of a voyage from one discharge port to the next loading port is made without cargo, seawater ballast must help to maintain the required draft for safety and to enhance maneuverability. When the dirty ballast is permitted to settle long enough, separation of the oil and water will take place, and clean water from the bottom of the tank can be drawn off without polluting the seas. The washings which contain oil are stored in a special holding tank and the cleaned tanks are filled with clean seawater ballast. When the ship gets to the loading port, the clean water ballast is discharged to the sea and the oil/water mixture may be discharged ashore or compatible cargo loaded on top. The paper also discusses Exxon's control of accidental discharges. This includes those occurring as a result of equipment failure and human error.

  • Corporate Authors:

    International Association for Pollution Control

    Conference on Pollution Control in the Maritime Industries
    Washington, DC  United States  20006
  • Authors:
    • Hemminghaus, R R
    • Cornett, D E
  • Publication Date: 1974-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00098200
  • Record Type: Publication
  • Source Agency: International Association for Pollution Control
  • Files: TRIS
  • Created Date: Jul 29 1975 12:00AM