How do you identify microbiologically influenced corrosion in water pipelines?
There are several approaches that can be used to identify microbiologically influenced corrosion (MIC) in pipelines.
Corrosion monitoring using coupons in a bypass rack is one of the most common methods for detection. The coupons can be easily removed and visually inspected for signs of MIC. If a problem is suspected, the coupons can be pulled and sent to a qualified lab for further examination. (Learn more about coupons in How Corrosion Coupon Holders Can Preserve Your Valuable Assets.) Electrochemical probes can also serve a similar function. In addition, observing corrosion rate meter response to system changes, such as an increased feed of biocide, can also aid in diagnosis.
It’s best to monitor the system for biofilm formation and take corrective action early on to prevent MIC from occurring at all. Historically, techniques for sessile bacteria monitoring have been used to grow the biofilms including corrosion coupons, NiCr mesh coupons, beads and biobox panels. Plate counts, dip slides, organism specific cultures, adenosine triphosphate (ATP) measurements and microscopy are used to estimate the propensity for and severity of fouling, the creation of biofilms and the cleanliness of the system.
Free Download: How To Detect Pipe Corrosion in Underground Force Mains, Plus Must-Have Corrosion Detection Equipment |
Finally, a visual inspection of system components should not be overlooked in identifying the potential for MIC. For example, significant tuberculation of carbon steel piping would suggest further investigation and nondestructive examination (NDE) testing might be warranted.
Tags
Written by Peter Macios | Executive Product Manager of Water Services and Industrial Process at SUEZ Water Technology and Solutions

Peter Macios is the Executive Product Manager of Water Services and Industrial Process at SUEZ Water Technology and Solutions. Peter provides strategic direction for product development, portfolio management, and go-to-market strategies ensuring sustainability and growth of this industry leading product line.
More Q&As from our experts
- Who does microbiologically influenced corrosion affect most?
- How can pipeline leaks promote microbiologically influenced corrosion?
- What new methods can treat microbiologically induced corrosion?
Related Terms
- Microbiologically Influenced Corrosion
- Corrosion Monitoring
- Corrosion Coupon
- Electrochemical Corrosion Test
- Biocide
- Biofilm
- Microbiocide
- Microscopy
- Fouling
- Tuberculation
Related Articles

Corrosion Assessment: 8 Corrosion Tests That Help Engineers Mitigate Corrosion
Don't miss the latest corrosion content from Corrosionpedia!
Subscribe to our newsletter to get expert advice and top insights on corrosion science, mitigation and prevention. We create world-leading educational content about corrosion and how to preserve the integrity of the world’s infrastructure and assets.
- AC Mitigation: How to Maximize Your Potentials
- Tank Bottom Corrosion on the Soil Facing Side - Solved
- Beyond the Surface: Diving Deep Into Steel Protection
- Over-Voltage Protection
- Using Flange Isolation Kits and Monolithic Isolation Joints
- How to Properly Spec a Monolithic Isolation Joint
- Improving Pipeline Emissions: The Role of Flange Isolation Kits