The design, testing, and operational results from a subsea, electric-resistance probe system are discussed. Subsea monitoring provides the advantage of measuring the corrosion inhibitor efficacy at the point of injection, rather than inferring performance from platform measurements. The internal condition of pipelines can be monitored in a variety of ways. Electric resistance probes are one technique for acquiring subsea corrosion rate data. The optimum monitoring technique will change with pipeline age, location, accessibility, and operating conditions. More importantly, the applicable methods may change based on the type of information required. For evaluation of corrosion inhibitor performance a high-sensitivity corrosion monitor is required. A prototype dual-element, electric-resistance probe has been evaluated for pressure and temperature stability under subsea operating conditions simulating the Britannia field.The probe functioned well under all test conditions. As expected, temperature had the greatest impact on the stability of the corrosion measurements. Comparison of the relative response of the dual probes to the variety of test conditions is useful in evaluating the validity of field data and the functionality of the probe.The value of the field data from the subsea probes was apparent from an operational perspective. The development of a correlation between the topsides and subsea corrosion rates is a useful prediction tool. The probes were successfully installed, demonstrated the sensitivity to detect design corrosion rates, enabled evaluation of corrosion inhibitor performance, and confirmed proper location of the inhibitor injection point. However, the overall performance of the probes has not been as favorable as experienced during the evaluation program. Unfortunately, one of the two probes has failed for unknown reasons during the first year of operation. Plans for replacement are being developed.
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