After mentioning work carried out at the IFS, Flensburg, over the last decade on the reliability of ship machinery and components the Author (of the IFS) gives an account, together with some relevant reliability theory, of an investigation in which the operational reliability of two types of Stal Refrigerant-22 compressors installed in refrigerated ships was compared. The reliability data were obtained with the co-operation of the shipowners (Scipio, of Bremen, and Salen, of Stockholm). One type of compressor was the P46B; reliability data on these reciprocating compressors were supplied from a ship in which 16 were installed, and covered a period of just over six years. The other was the S542D, a screw-type compressor; the data were obtained from three ships, each with four identical installations (including one reserve), and covered a period of nine or ten years for each ship. The methods used in the investigation are explained in some detail, and an analysis of the results for the compressors and their individual components is presented and discussed. Failure probability of the reciprocating compressor was several times that of the screw compressor at all times; after about four years' operation (about 12,000 running hours) it was four times as great. Similar methods of investigation can be used for other technical equipment, provided it can be coded for clear identification; if reliability data are fed back by the method recommended by the IFS, the necessary information is readily available and statistical evaluations can be made with a comparatively simple computer-program. Order from: BSRA as No. 48,896.

  • Corporate Authors:

    Schroedter (C) and Company

    Stubbenhuk 10
    Hamburg 11,   Germany 
  • Authors:
    • BRANDT, H
  • Publication Date: 1978-4


  • German

Media Info

  • Features: References;
  • Pagination: 5 p.
  • Serial:
    • HANSA
    • Volume: 115
    • Issue Number: 7
    • Publisher: Deutsche Bahn AG

Subject/Index Terms

Filing Info

  • Accession Number: 00180055
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Sep 14 1978 12:00AM