Chuetsu Waukesha Co. Ltd, which had already produced stern-tube sealing systems that were virtually free from liner pitting and wear, had an outstanding problem: sporadic blistering of the seal rings. Research was carried out, by the company's staff and others, to investigate the causes of the trouble and provide a solution; this research differed from earlier studies in that chemical and molecular-structure approaches were followed. A successful solution was obtained, and the company now produces a new and improved seal ring. The article gives a detailed account of this extensive study, in which the ring materials, shapes, and performance were investigated. Tests of materials showed that the acceleration of fatigue degradation, to which blistering is attributable, is greatly influenced by the presence of sea water and by the magnitude of cyclic stresses. A new blend of material now used for the rings embodies careful consideration of these factors; it is least susceptible to the rupture of molecular chains, and has excellent physical properties. The new ring has a shape designed to have an extremely small range of cyclic stresses, and has adequate resistance to fatigue. It is much superior to other rings in both sealing performance and wear resistance. Order from BSRA as No. 54,769.

  • Corporate Authors:

    Tokyo News Service Limited

    10 Ginza Nishi, 8-chome, Chuo-ku
    Tokyo,   Japan 
  • Publication Date: 1980

Media Info

  • Pagination: p. 34
  • Serial:
    • Zosen
    • Volume: 25
    • Issue Number: 9
    • Publisher: Tokyo News Service Limited

Subject/Index Terms

Filing Info

  • Accession Number: 00330001
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM