How to Prevent MIC?

  In wet and dry fire sprinkler systems, Microbiologically Influenced Corrosion (MIC) and other forms of internal corrosion are primarily driven by two critical variables:

1. Fabrication residues and debris left inside the pipe.

2. Oxygen present at gas–water interfaces (in wet systems after flooding, and in dry systems where trapped condensation exists).

  Left uncontrolled, these variables accelerate early-stage corrosion, catastrophic leaks, and forced system shutdowns—the exact nightmare building owners and contractors must avoid.

  Our Corrosion (MIC) Prevention Solution is specifically engineered to eliminate both variables and document performance over time. This is exactly why we confidently back our clean-interior pipes with a 15-Year Limited Leak Warranty for Warranty-Qualified Projects.

The Three Pillars of Our Solution:

(1) Clean-Interior Steel Fire Sprinkler Pipe

In typical wet and dry systems, fabrication residues such as fines, mill scale, and cutting fluids remain heavily on pipe interiors. These residues provide the perfect surfaces and nutrients for biofilm to establish, initiating under-deposit corrosion and MIC.

Our approach removes this variable: We supply clean-interior, UL/cUL listed steel fire sprinkler pipe. By actively eliminating the residues and debris that act as biofilm starting points, we go far beyond the standard NFPA 13 intent.

For Wet Systems: WPNI can only control corrosion that occurs after water flooding; the internal cleanliness of the bare steel still determines how quickly corrosion starts and spreads.

For Dry Systems: It maximizes the efficiency of nitrogen inerting, slowing corrosion even where trapped water exists.

  In both scenarios, the internal cleanliness of the bare steel dictates how quickly corrosion can start. That is why our primary focus is absolute cleanliness.​ Without a clean interior baseline, even the best nitrogen systems are compromised.

(2) Low-Oxygen Handover (Nitrogen Inerting)

  Trapped air inside piping leaves oxygen at gas–water interfaces, which aggressively drives early-stage corrosion and creates destructive deposits. To neutralize this threat, we implement a strict nitrogen inerting protocol prior to system handover.

Targeted Inerting Solutions:

Wet Systems: We combine NFPA 13 air venting at strategic high points with Wet Pipe Nitrogen Inerting (WPNI). We work exclusively with tier-1 nitrogen system vendors (ECS, Potter, Tyco, or equivalent) to actively displace oxygen with nitrogen.

Dry Systems: We execute comprehensive Dry Pipe Nitrogen Inerting (DPNI), strictly aligning with documented project specifications to purge residual oxygen.

The Acceptance Standard: O₂ ≤ 2%

  Our mandatory handover metric is an oxygen level of ≤ 2% at representative high points (for wet systems) or remote sampling zones (for dry systems). This critical data is strictly documented and included in your final Project Handover Package. By establishing this low-oxygen environment, we drastically reduce the driving force for corrosion the moment the system is placed into long-term service.

(3) Ongoing Documentation and Maintenance

  We do not claim sterilization—potable fill water isn't sterile, and we don't leave chemicals in the service water. Instead, our scientific control method is straightforward:

Cleanliness: Start with a medical-grade clean-interior pipe.

Oxygen Management: Achieve and maintain low oxygen in the system.

Documentation: Prove it over time.

The program strictly requires:

  • Annual oxygen spot checks.
  • Re-inerting after major water additions or significant modifications.
  • Routine NFPA 25 inspection, testing, and maintenance to keep the system within the design envelope.

  Your qualified fire protection contractor maintains both the physical system and the critical records (NFPA 25 reports, oxygen logs, re-inerting records) required to keep the warranty in full force.

Why Can We Offer a 15-Year Limited Leak Warranty?

  Because our program is heavily outcome-based (Cleanliness + Oxygen Management + Documentation). We confidently offer a 15-year limited leak warranty to building owners when qualified contractors install our clean-interior pipe, achieve a verified low-oxygen handover, and maintain the system within program requirements.

  In simple terms: We control the exact physical and chemical variables that drive MIC, and we prove it over time. That is why we are willing to stand firmly behind our pipe with a long-term, owner-facing leak warranty.

Ready to price a project? Visit Get a Quote.