Corrosion monitoring and control in refinery process units

Alec Groysman, Avihu Hiram

Research output: Contribution to journalConference articlepeer-review

15 Scopus citations

Abstract

This paper describes the experience gained in "corrosion monitoring" in the overhead systems of three crude distillation units of a refinery in Haifa, Israel. The data of electrical resistance (ER) probes, connected to an on-line data acquisition system were compared with the mass loss method and chemical analysis of accumulated sour water after condensation in the overhead system. SEM & EDS analysis of films and deposits formed on the coupons showed that iron sulfide with impurities of chlorides are responsible for the corrosion extent. The corrosion was less than 5 MPY when a uniform tenacious iron sulfide films of 10-50 microns thickness were formed. The severe corrosion occurred when deposits and non-uniform films of more than 80-100 microns thickness were formed. Special attention was given to ER probes which were connected on-line to the process units and enabled the operators to react immediately to any change in corrosion rates.

Original languageEnglish
JournalNACE - International Corrosion Conference Series
Volume1997-March
StatePublished - 1997
Externally publishedYes
EventCorrosion 1997 - New Orleans, United States
Duration: 9 Mar 199714 Mar 1997

Bibliographical note

Publisher Copyright:
© 1997 by NACE International.

Keywords

  • Accumulated condensed sour water
  • Corrosion monitoring
  • Crude distillation unit
  • Distributed control system (DCS)
  • Electrical resistance (ER) probes
  • Mass loss method (coupons)
  • On-line corrosion monitoring system

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