The Authors, of ARCO Transportation Co., discuss the energy consumption and propulsion-machinery maintenance of three Anchorage-class (120,300-dwt) steam-turbine tankers and three Independence-class (153,800-dwt) Diesel-propelled tankers of their company's fleet. After describing these two classes of tanker, with particular reference to their power plants, and giving some information on their trading patterns (the steamships operate on the Alaska service and the motorships on the Persian Gulf service), the Authors present and discuss data on the power-plant performance of the respective classes, including the propulsion and maintenance costs on a horsepower-hour basis. The data are taken from a continuing programme for the assessment and improvement of the efficiency and reliability of the company's tankers, and the fuel consumption, energy costs, and maintenance costs represent actual operating experience. The data are not intended for a general comparison of the cost-effectiveness of steam versus Diesel machinery; in particular, the maintenance experiences cannot be directly compared because of differences in the operating and maintenance practices for the two classes of ship. Propulsion plant selection and first-cost analysis are outside the scope of the paper. The energy consumption data presented should be useful, but there are several other factors that owners must consider when choosing between the two types of propulsion. The Authors also discuss some practical problems associated with using data from ships' log-books as a basis for analysing machinery performance. The paper includes information on programs developed for calculating (with a programmable calculator) from log-book data the power developed and other performance data relating to the power plants in the two classes of ship. With appropriate modification, these programs can be used for other Diesel and steam-turbine installations.

  • Supplemental Notes:
    • Paper presented to the San Diego Section of SNAME, 21 April 1979.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Levine, R A
    • Sucharski, D B
    • Stewart, E V
  • Publication Date: 1979

Media Info

  • Features: References;
  • Pagination: 50 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00317469
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Oct 8 1980 12:00AM