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Sheath Materials for Direct Electrical Heating Cable: Long Term Testing

[+] Author Affiliations
Bjo̸rn Melve

Statoil ASA, Trondheim, Norway

Paper No. OMAE2007-29282, pp. 91-97; 7 pages
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 4: Materials Technology; Ocean Engineering
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4270-3 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME


A high voltage cable is strapped to the flowlines on the HTHP Kristin field as a part of the direct electric heating (DEH) system. The cable with its components has to function in temperatures above 100 °C since it is connected to the hot flowlines. Four different candidate cable sheath materials were exposed to an accelerated ageing program that simulated the conditions the cable should survive during the twenty years lifetime. The materials were a stiff polypropylene (pipe grade), a rubber modified polypropylene, a thermoplastic elastomer and polyvinylidenfluoride (PVDF). The test conditions were one year exposure in 130 °C oxygenated sea water (8 ppm O2). After the exposure were the mechanical properties of the thermoplastic elastomer significantly degraded and the surface of the material was greasy. The stiff polypropylene was not stable for a long term exposure at these conditions. The rubber modified polypropylene was an acceptable sheath material. The PVDF material was not influenced by the exposure and was the best ranking material.

Copyright © 2007 by ASME
Topics: Cables , Testing , Heating



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