The oil crisis of the mid-1970s created new conditions that promoted interest in optimising the reduced-power operation of the steam plant of large tankers. As little information was available on this mode of operation, the Authors' company (Esso International Services Inc.) began investigations which developed into the fuel conservation programme described in this paper and which is primarily concerned with improving propulsion-plant efficiency. The fleet concerned is international and consists of 25 steam-driven VLCCs and ULCCs in the 22,800-33,100 kW power range, built in Europe and Japan. Other fleets within the company are undertaking similar programmes, and an extension to motor tankers is under consideration. After exploratory investigations which revealed that plant operation fell short of design efficiency at full power and was well short of attainable efficiencies at reduced powers, a fleet programme was established to realise the benefits these investigations had shown to be possible. This programme, which is described and discussed in some detail, included the training of ships' and shore-based engineers in instrumentation, the collection of plant performance data, and action to improve performance and maintain the improvement. As this programme developed, it was found that fuel rates at full power improved towards the sea trials values. There are potentially larger savings at reduced powers, where a variety of methods of operation were previously used without adequate consideration of the effects on fuel consumption. Performance monitoring is essential and should be done on a continuous basis, preferably by an "energy conservation group" with some independence from the vessel's operations management. Real long-term fuel-savings can be maintained by seeking and remedying the causes of deviations from the set standards. Order from BSRA as No. 54,785.

  • Supplemental Notes:
    • Institute Marine Engineers, Conference on Combustion of Fuels in Ships, 1979-1985.
  • Corporate Authors:

    Institute of Marine Engineers

    Memorial Building, 76 Mark Lane
    London EC3R 7JN,   England 
  • Authors:
    • Attwood, J H
    • Falberg, R M
  • Publication Date: 1979-10-12

Media Info

  • Features: References;
  • Pagination: 8 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00330007
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Paper C45
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM