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This study seeks to generate corrosion data with a view to determining weak sections of the flow lines/wellhead structural facilities and installations. The offshore corrosion survey is also aimed at ascertaining the effectiveness of the CP system and integrity of the Crude Oil/Gas networks.
This study seeks to generate corrosion data with a view to determining weak sections of the flow lines/wellhead structural facilities and installations. The offshore corrosion survey is also aimed at ascertaining the effectiveness of the CP system and integrity of the Crude Oil/Gas networks. A four- phased survey procedure adopted in the work includes: Initial condition assessment, flow line/ wellhead cleaning, UT Intraspect Imaging, and Manual UT scanning using a D-meter.
Keywords: ultrasonic thickness measurement, marine structure integrity, marine corrosions, risk assessment
Twelve-year laboratory tests of rebar reinforced concrete beams partially submerged in artificial seawater have confirmed that steel corrosion may occur a few months after immersion and may continue for many years.
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In seawater, higher strength nickel-copper alloys are used as alternatives to copper alloys. These can be susceptible to chloride stress corrosion cracking and hydrogen embrittlement in conditions where cathodic protection is utilized. Copper-Nickel-Tin alloys (CuNiSn) show low corrosion rates in the free and coupled conditions. Resistance to hydrogen embrittlement is demonstrated.
A novel evaluation technique, based on an artificial pit electrode, has been developed for inhibitor studies. The first example is of three generic inhibitors, against localised corrosion. The second is of three industrial inhibitors against existing localised corrosion on a north sea production platform