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CL BLOG Continued from page 43
higher if your equipment permits. Use of a steel grit abrasive provides more cutting action so I would use it to speed up the blast operation and possibly try a larger grit size with the increased pressure. In- creased pressure and larger grit size will speed up removal of the black patches but will not provide as much cleaning action as would be performed if you used a smaller grit size.
A
recommend ultrahigh water blasting at a minimum psi of 30,000 (207 MPa), de- pending on access to the area. Also, consider using a chloride-removing solu- tion, and then abrasive blast clean. Do not abrasive blast clean before removing salts as you then trap contaminants in the profile—always clean before abrasive blast cleaning.
A — Next Month in Pipeline Corrosion
Successful Implementation of External Corrosion Direct Assessment Methodology
Installing a Deep Anode Groundbed in a Marsh Environment
Materials and Corrosion Control in Desalination Plants
Supporting Corrosion Management with Forensic Corrosion Engineering
Testing Protective Coatings for Offshore Wind Turbines
NACE International, Vol. 51, No. 4 April 2012 MATERIALS PERFORMANCE 45 —
Your problem sounds like chlo- ride contamination in the sub- strate. Using 80-psi air pressure will not remove this. I would
The actual removal of these black patches can be handled quickly if you get the nozzle pressure up to at least 100 psi and preferably
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