An analytical study, supported by full-scale sea trial data, has been conducted to improve the fuel efficiency of Navy 1200 PSI steam propulsion plants. The overall objective was to identify cost-effective procedural and hardware modifications which will result in at least a 10% reduction in annual fuel consumption. These results are then used to initiate follow-on programs leading to fleet implementation of improved shipboard machinery systems and operating procedures. The FF 1052 class of 4,000 ton frigates was chosen as the baseline for this study. Using a computer model to perform heat balances for the FF 1052 plant, estimated fuel savings associated with various machinery and/or procedural changes were calculated. These savings were then verified, where possible, by sea trials. Following reduction of the trials data, further computer analyses were conducted to examine the cost-effectiveness of the proposed changes. The results indicated that an annual fuel savings of 10% with a total payback period of 2 1/2-3 years can be realized by implementing the following hardware changes: Replacement of one steam turbine main feed pump drive with a coldstart turbine to eliminate the necessity of constant idling of a standby pump. Addition of a main boiler stack gas oxygen monitoring system and associated automatic controls to maintain optimum excess combustion air at all loads. Replacement of the boiler economizer with a more efficient unit to increase feed temperature and reduce stack losses. In addition, several procedural changes involving operating the minimum number of steam driven equipments when possible will result in further savings.

  • Supplemental Notes:
    • Paper presented at SNAME (Gulf Section) Spring Meeting and Star Symposium: Merchant & Naval Design, The Past in Review The Future in Forecast, Houston, April 25-28, 1979.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Fleming, J R
    • Mitchell, P R
  • Publication Date: 1979

Media Info

  • Pagination: 15 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00189640
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: Apr 25 1979 12:00AM