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Title: Anode consumption on a subsea X-mas tree

Abstract

Anode consumption and coating breakdown on a X-mas tree installed at the Troll Field in the Norwegian North Sea was investigated after 5 years. A comparison with a spare tree and one tree being exposed for only 3--4 months was done. The epoxy coating has several blisters, in particular on stainless steel surfaces. Water inside the blisters has a pH of 13-14 indicating that the cathodic reaction occurs inside them. The anode dimensions indicate an overall anode consumption of approximately 20%, while the design allows 27% after 5 years. This indicates that the original design is quite conservative. If the design had been done according to present day design rules, the conservatism would be reduced; an overall anode consumption of 23% is then likely (still less than allowed 27%).

Authors:
 [1]
  1. Norsk Hydro Research Centre, Porsgrunn (Norway)
Publication Date:
OSTI Identifier:
352566
Report Number(s):
CONF-980316-
TRN: IM9928%%160
Resource Type:
Conference
Resource Relation:
Conference: Corrosion `98, San Diego, CA (United States), 22-27 Mar 1998; Other Information: PBD: 1998; Related Information: Is Part Of Corrosion `98: 53. annual conference and exposition, proceedings; PB: [6600] p.
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; CATHODIC PROTECTION; NATURAL GAS FIELDS; FIELD PRODUCTION EQUIPMENT; NATURAL GAS WELLS; ANODES; PROTECTIVE COATINGS; OFFSHORE PLATFORMS; EPOXIDES; STAINLESS STEELS

Citation Formats

Lye, R E. Anode consumption on a subsea X-mas tree. United States: N. p., 1998. Web.
Lye, R E. Anode consumption on a subsea X-mas tree. United States.
Lye, R E. 1998. "Anode consumption on a subsea X-mas tree". United States.
@article{osti_352566,
title = {Anode consumption on a subsea X-mas tree},
author = {Lye, R E},
abstractNote = {Anode consumption and coating breakdown on a X-mas tree installed at the Troll Field in the Norwegian North Sea was investigated after 5 years. A comparison with a spare tree and one tree being exposed for only 3--4 months was done. The epoxy coating has several blisters, in particular on stainless steel surfaces. Water inside the blisters has a pH of 13-14 indicating that the cathodic reaction occurs inside them. The anode dimensions indicate an overall anode consumption of approximately 20%, while the design allows 27% after 5 years. This indicates that the original design is quite conservative. If the design had been done according to present day design rules, the conservatism would be reduced; an overall anode consumption of 23% is then likely (still less than allowed 27%).},
doi = {},
url = {https://www.osti.gov/biblio/352566}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 31 00:00:00 EST 1998},
month = {Thu Dec 31 00:00:00 EST 1998}
}

Conference:
Other availability
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