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FAILURE OF SCREW PROPELLERS OF SHIPS OPERATING IN THE PACIFIC OCEAN BASIN

The reasons for failure of steel and nonferrous screws on ships and tugs of the Far-East Steamship Company operating in the Pacific are analyzed. The service life of nonferrous screws never exceeds by 1.5 times the service life of carbon steel screws and the two periods are frequently equal. Operations in heavy winter ice cause failures in 100% of the nonferrous screws and in 30--50% of the steel screws as a result of mechanical damage. Recently, tugs have been fitted with 1Kh14ND stainless steel screws which fail only for mechanical reasons, but call for careful manufacture because gas and scale inclusions in metal lead to corrosion-cavitation failures. Bronze screws are also subject only to mechanical failure, while regular steel screws suffer mainly from corrosion-cavitation failures. Nonferrous screws operate 21--108 months, while carbon steel screws operate 7--84 months, with the quality of the overhaul work having a great influence on the screw lifetime. Efforts should also be made to strengthen nonferrous screws for longer lifetime. Electrochemical methods must be developed to reduce the corrosion failure of steel screws.

  • Corporate Authors:

    TsNIIMF

    Leningrad,   USSR 
  • Authors:
    • Kaplin, YuM
  • Publication Date: 1967

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00014977
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Files: TRIS
  • Created Date: May 7 1971 12:00AM