Detect the Potential for MIC in Tanks and Sumps Before it Happens
• Install at the top of 4" riser pipe from diesel USTs.
• Also installs inside gasoline & diesel dispensers and sumps.
• ASTs and on top of floating roof tanks.
• Detects potential for aggressive MIC corrosion causes by acidic conditions.
• Does not detect common non-aggressive light corrosion causes by moisture.
• Compatible with all Adsistor based UST monitoring systems.
• Can be checked with a hand-held ohm meter.
• Detects potential for corrosion before corrosion appears on mild steel coupons in side-by-side testing.
• Detects corrosive conditions both in condensing atmospheres and dry atmospheres (RH < 50%).
• Not affected by long term exposure to neutral (pH 7) condensing humidity.
• Not affected by long term exposure to saturated diesel vapor or intermittent exposure to gasoline vapor.
How it Works
A substantial improvement in resistive corrosion probe technology is accomplished by breaking up a single corrosion probe into thousands of individual micro-probes which are connected end to end. Corrosion on any single micro-probe acts in accordance with the series law of additive resistance instead of the parallel law of additive resistance. A dramatic amplification of response to corrosion is thereby achieved which gives an early warning to corrosive conditions long before corrosion occurs.
The Adsistor MIC sensor utilizes micro-particles of electrically conductive ferrous material which have been fixed in place by means of flexible anchors. These particles are shaped and spaced such that they are not normally in contact with each other. When a magnetic field is applied across all the particles the flexible anchors allow the particles to align with the applied field so that the particles are now in contact with their neighbor particles. An electrical path is thereby established through the sensor. Should corrosion occur at any particle junction, the electrical path is broken.
Microbial Influenced Corrosion vs. Common Corrosion
The Adsistor MIC Sensor only detects the conditions that cause microbial influenced corrosion. It does not detect common surface area corrosion or the conditions that cause common corrosion.
Microbial influenced corrosion (MIC) is caused by the activity of bacteria and their byproducts. Formic acid and acidic acid are byproducts of bacterial metabolism and are considered the chief agents producing the aggressive type of corrosion found in USTs and ASTs storing low sulfur fuel. Water is also present. MIC continues to attack mild steel until it is completely consumed.
Common surface area corrosion is cause by more or less neutral pH water coming into contact with mild steel in the presence of air. Common surface area corrosion forms a relatively thin surface layer of oxidation which usually protects the underlying steel from any further corrosion.