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The Material

KME Alloys OSNA®-10 and OSNA®-30

For decades, seawater pipe systems made of cupronickel alloys have been put to successful use on seagoing vessels and offshore production units like platforms, drilling rigs, semisubmersible FPSOs etc.

The chemical composition of OSNA®-10 (CuNi 90/10) and OSNA®-30 (CuNi 70/30) cupronickel alloys have been modified so that they meet the requirements of all the main international standards (see Table Standard Specifications). Reduced tolerance limits for certain impurities moreover provide for an enhanced cold workability and weldability of KME's alloy.

The main properties and advantages of cupronickel alloy are:

  • excellent resistance to
        - marine growth (no chlorination necessary)
        - cavitation erosion
        - stresscorrosion cracking
  • good resistance to
        - general corrosiony
        - localized attack
  • recommended velocity
        - 3.0 - 3.6 m/sec.

OSNA®-10 and OSNA®-30 seawater pipes are manufactured in two configurations:

  • seamless
  • seam-welded

OSNA®-10 (CuNi 90/10)

  • 6-457 mm O.D. seamless,
  • up to 1200 mm O.D. seam-welded

 International Standards
  • DIN 17664/17671 2.0872
  • DIN 86019 2.1972
  • BS 2871 CN 102
  • EEMUA 144 UNS 7060x
  • ASTM-B-466 C 70600
  • MIL-T-16420 K C 70600
  • JIS H 3300 C 7060T

OSNA®-30 (CuNi 70/30)

  • 6-323.9 mm O.D. seamless,
  • up to 1200 mm O.D. seam-welded

 International Standards
  • DIN 17664/17671 2.0882
  • BS 2871 CN 107
  • ASTM-B-466 C 71500
  • MIL-T-16420 K C 71500
  • JIS H 3300 C 7150T

Besides pipes, KME offers a comprehensive range of fittings in different sizes and dimensions, enabling seawater pipe systems to be constructed for different applications.




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