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Corrosion Monitoring & Inspection Glossary - E

  • Elastic Limit: The maximum stress to which a material may be subjected without retention of any permanent deformation after the stress is removed.

  • Electric Potential: A voltage existing between the pipe and its environment.

  • Electric Resistance Weld (ERW): Weld formed by resistance heating of the two edges of a pipe and then forcing them together to create a solid-state weld.

  • Electrical resistance probe (ER): Corrosion monitoring technique which provides a measurement of the change in cross sectional area of an electrically conducting material probe through a test of its resistance.

  • Electrochemical impedance spectroscopy (EIS): Corrosion monitoring technique, primarily only used in laboratories, which is an extension of LPR. It uses a full spectral range of applied potential sine waves from 100 kHz down to 1 mHz.

  • Electrochemical noise (EN): A passive corrosion monitoring technique which monitors the naturally occurring fluctuations of the current and potential over the surface of a corroding interface.

  • Equivalent weight (EW): The quantity [g] of metal consumed by the passage of one Faraday of electric charge.

  • Erosion: Destruction or removal of material by abrasive action of moving fluids (or gases) usually accelerated by the presence of solid particles or matter in suspension.

  • Erosion corrosion: Corrosion due to the accelerated material degradation under the influence of relative motion between a corroding surface and a corrosive environment.

  • Estimated Repair Factor (ERF): The ratio of the pipeline design pressure to the 'safe maximum pressure' as determined by an analysis criterion (e.g. ASME B 31G, RSTRENG, …).

  • Evaluation: A review, following the identification of an anomaly, to determine whether the anomaly meets specified acceptance criteria.

Corrosion Inspection and Monitoring