The objective was to determine the suitability of lined-steel piping for use in ships' salt-water circulating systems with a view to providing a more satisfactory alternative to short-life galvanized mild steel and to high-cost alloy systems. This report details the results of tests carried out on nine coatings by the Ship Research Institute of Norway in their Sea-Water Corrosion Laboratories at Sandefiord. Tests were carried out on PVC, Nylon 11, Nylon 12, chloroprene, soft natural rubber, solvent-free epoxy (air-cured) pure epoxy (electrostatically applied) phenolic resin with formaldehyde and CTE. Only three materials gave results in all the tests which suggested a potential for use as a lining for salt-water piping; these were PVC, chloroprene and soft natural rubber. Both chloroprene and soft natural rubber have satisfactorily withstood all the conditions likely to be met in ships' salt-water circulating systems and simulated in the series of tests detailed in this report and would appear to be suitable for the lining of steel pipes in such systems. PVC gave equally satisfactory results in all the tests, with the exception of that carried out to determine the effect of chlorination. On exposure to seawater containing 2 ppm of chlorine, the PVC suffered from blistering and complete loss of adhesion to the substrate. All the remaining lining materials tested were unsatisfactory and failed as a result of the presence of defects, low film thickness, or poor resistance to impact.

  • Corporate Authors:

    Ship Research Institute of Norway

    P.O. Box 4125, Valentinlyst, Hakon Hakonsongt. 34
    N-7001 Trondheim,   Norway 
  • Authors:
    • Frederick, S H
    • Jensen, F O
  • Publication Date: 1976-11

Media Info

  • Features: References;
  • Pagination: 33 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00178179
  • Record Type: Publication
  • Source Agency: Ship Research Institute of Norway
  • Report/Paper Numbers: R-54.76 Final Rpt.
  • Files: TRIS
  • Created Date: Jul 19 1978 12:00AM