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 language | English |
|---|---|
| Journal | NACE - International Corrosion Conference Series |
| Volume | 1997-March |
| State | Published - 1997 |
| Externally published | Yes |
| Event | Corrosion 1997 - New Orleans, United States Duration: 9 Mar 1997 → 14 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