pH of hydro test water needed to reduce likelihood of MIC?

pH of hydro test water needed to reduce likelihood of MIC?

• A. >10
• B. <7
• C. 7
• D. >9

Answer: (A)

Microbiologically influenced corrosion (MIC) is suppressed by making the water chemistry unfriendly to microbes. When hydrotest water is highly alkaline, with a pH above 10, most bacteria and biofilm-forming organisms struggle to survive or multiply. This reduces the chance of MIC forming during the test and in the pipeline afterward, because the microbial activity that drives MIC is minimized in such an alkaline environment. Lower pH values (acidic or neutral) are more conducive to microbial growth, so they don’t help prevent MIC. An alkaline level above 9 helps, but the strongest reduction in MIC risk comes from pushing pH above 10, which is why that option is chosen. Keep in mind that high pH must be managed with other hydrotest controls (disinfection, turnover, etc.) to avoid other issues, but for MIC risk reduction, pH > 10 is the most protective.

Microbiologically influenced corrosion (MIC) is suppressed by making the water chemistry unfriendly to microbes. When hydrotest water is highly alkaline, with a pH above 10, most bacteria and biofilm-forming organisms struggle to survive or multiply. This reduces the chance of MIC forming during the test and in the pipeline afterward, because the microbial activity that drives MIC is minimized in such an alkaline environment.

Lower pH values (acidic or neutral) are more conducive to microbial growth, so they don’t help prevent MIC. An alkaline level above 9 helps, but the strongest reduction in MIC risk comes from pushing pH above 10, which is why that option is chosen. Keep in mind that high pH must be managed with other hydrotest controls (disinfection, turnover, etc.) to avoid other issues, but for MIC risk reduction, pH > 10 is the most protective.