Use of the FSM technique in the laboratory to measure corrosion inhibitor performance in multiphase flow
- AEA Technology, Oxfordshire (United Kingdom)
Two-phase flow in pipelines, particularly slug flow, induces high shear stresses at the walls that can interfere with the performance of corrosion inhibitors. Conventional electrochemical techniques are poorly suited to making corrosion measurements under these conditions in the laboratory. The introduction of electrical resistance or other corrosion probes can disturb the flow pattern. The paper describes the adaptation of an electrical resistance mapping technique to evaluate the performance of corrosion inhibitors in defined two-phase flow regimes in thin-walled (1 mm) tubes in the laboratory over periods of the order of 24 h, providing on-line information on pipeline geometries as a function of circumferential position. Two plastic hemicylindrical jackets were designed and manufactured with 24 pairs of spring loaded pins to contact the outside surface of the tubular test specimen and measure metal loss through changes in the voltage between them when a current was passed through the specimen. Tests were carried out in slug flow with and without corrosion inhibitors in deoxygenated 3 wt% NaCl brine under 1 bar CO{sub 2} pressure using specimens manufactured from the wall of an X-65 pipeline steel. A sensitivity of 0.1% of wall thickness was demonstrated (1 {micro}m metal loss with a 1 mm wall). Good agreement was obtained between corrosion rates measured by this method and weight loss and chemical analysis of corrosion products.
- OSTI ID:
- 350185
- Report Number(s):
- CONF-980316--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electrochemical methods for monitoring performance of corrosion inhibitor under multiphase flow
Effects of multiphase flow on corrosion inhibitor