Use of an integrated salt bridge and steel ring coupon for potential measurement on cathodically protected structures
Book
·
OSTI ID:128690
- Chevron Research and Technology Co., Richmond, CA (United States)
- Corrosion Failure Analysis and Control, San Ramon, CA (United States)
The basis of CP (cathodic protection) is to shift the potential of a metallic structure, which is in contact with an electrolyte, in the negative direction until corrosion has been adequately mitigated. Potential criteria have been established by NACE International RP0169-92 to provide guidance on what levels of cathodic protection are adequate to control corrosion. One of the criteria is based on a single fixed potential, with consideration of voltage drops other than those across the structure-to-electrolyte boundary. Another is based on achieving a minimum level of CP, measured during formation or decay. This paper describes a unique probe configuration which incorporates a salt bridge and a fixed steel ring coupon to assist in making potential measurements on cathodically protected structures with consideration of voltage drop error. Details on probe installation, measurement techniques, and data from test sites located on two different buried pipelines are also presented.
- OSTI ID:
- 128690
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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