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Chloride Stress Corrosion Cracking in crude oil desalter

asked Aug 12, 2014 in Material by cchang219 (2,310 points)
What are the recommended repair procedures (if any) for a crude oil desalter that involved/showed Chloride Stress Corrosion Cracking?

2 Answers

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answered Aug 12, 2014 by sabdullayev (5,290 points) | edited Apr 22, 2015 by odadmin
 
Best answer

For Chloride Stress Corrosion Cracking (SCC) to occur, one of the following criteria has to take place:

  • Chloride content
  • Oxygen level
  • pH level
  • Temperature
  • Deterioration of materials’ surface
  • Weld crevice
  • Metals cross-contaminant
  • Cyclic conditions

To minimize Chloride Stress Corrosion Cracking, keep the followings in mind:

  • Keep the system/equipment dry to avoid SCC
  • Keep the Oxygen and pH content at a controlled environment to decrease Chloride SCC
  • Keep the temperature low to decrease Chloride SCC
  • Use coating with Thermal Sprayed Aluminum when piping or vessels are insulated
  • Stress Relieve Heat Treat (partial heat treatment if the equipment or structure is too large to perform at once) to reduce residual stress from welding during fabrication and repair
+2 votes
answered Aug 12, 2014 by Normandy (21,000 points)

This may not answer what you are looking for, but consider the following postings about Stress Corrosion Cracking when selecting materials for use in austenitic stainless steel pipework and vessels that may deteriorate in the chemical processing and petrochemical environments.

The results of sensitization treatment and cold work on stainless steels have been studied in large parts by many institutions to mitigate the stress corrosion cracking behavior and to suitably select material to fit its purposed design and environment.

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