Pipelines coatings disbondments require quick detection
- Specialty Pipeline Inspection and Engineering Inc., Houston, TX (United States)
Protective capabilities of external pipeline coatings tend to degrade and deteriorate over time. This degradation requires that the pipeline operator focus on those options which ensure continued safe, economical operation of the pipeline. Pipeline operators use many different methods for assessing pipeline integrity and the need for maintenance.The most common methods are: (1) Pearson surveys, (2) close interval cathodic protection surveys, and (3) intelligent pigging. Of these, close interval cathodic protection surveying is the most popular and is more widely used on a regular basis. Several other methods have been developed recently for detection of coating damage. These include variations on the On/Off survey with side drain measurements; a DCVG method using pulsed direct current and measurement of potential gradient in the soil next to a coating defect; and a current attenuation survey technique which injects alternating current onto the pipe and measures decay rate. All of these survey methods have been used and tested in a field environment. All have features which improve pipeline maintenance and rehabilitation programs. Although these methods can locate coating damage, none of them can accurately size defects or directly identify coating disbondment.
- OSTI ID:
- 49309
- Journal Information:
- Pipeline and Gas Journal, Journal Name: Pipeline and Gas Journal Journal Issue: 3 Vol. 222; ISSN PLGJAT; ISSN 0032-0188
- Country of Publication:
- United States
- Language:
- English
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