Investigate and remediate microbiologically influenced corrosion (MIC) found during internal piping assessment
domain: NFPA 25 ch. 14, MIC investigation · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Identify indicators consistent with MIC during a 5-year internal assessment or after a leak/pinhole failure: tuberculation, foul odor, black/orange biofilm, or pitting-type corrosion
Where MIC is suspected, expand sampling to additional locations, including low points and dead-legs, since MIC concentrates where water sits stagnant
Consider laboratory water/coupon sample analysis, per NFPA 25 annex guidance, to characterize the type and severity of microbial activity
Evaluate remediation options (chemical treatment, mechanical cleaning/flushing, pipe replacement, or a nitrogen-generator/corrosion-inhibitor retrofit for dry systems) based on severity rather than defaulting to full repipe
Report findings and the remediation recommendation to the owner as a deficiency requiring corrective action, since untreated MIC progresses to pipe failure
Known gotchas
MIC in dry and preaction systems is often driven by trapped moisture from incomplete drainage or humid compressed air -- treating the corrosion without correcting the moisture source (grading, low-point drains, nitrogen inerting) results in recurrence
Standard water-quality/chlorine residual testing alone can miss MIC, since the responsible organisms are often anaerobic and live under existing biofilm rather than in the free water -- a coupon or biofilm-specific sample is often necessary
Aggressive chemical biocide treatment applied without an engineering evaluation can react with system materials or create disposal/discharge issues under local environmental rules
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