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CUI (Corrosion Under Insulation) Videos CUI Program Video
Click here to view our Corrosion Under Insulation (CUI) Program video
A variety of tube inspection techniques are used for bundle inspections. The choice of technique depends on the tube material type. MISTRAS technicians are cross trained on IRIS, Remote Field Eddy Current, Near Field Eddy Current and standard Eddy Current techniques and use the same operating system to achieve these results. This "Cross Training" allows us to minimize the amount of technicians we need to deploy to your project, ultimately saving inspection dollars.

Heat Exchangers and Condensers are subject to various issues related to the tube bundles such as:
  • Internal and External Pitting and Corrosion and Erosion
  • Cracking (SCC, Fatigue, Thermal, Vibration)
  • Mechanical damage (Inlet Erosion, Baffle Fretting, Freeze Bulges, Tool Gouges)
A variety of advanced techniques are used for bundle inspections, such as:
Remote Field Testing (RFT)
Carbon steel tube bundles are inspected using RFT. The RFT technique utilizes the same platform as our standard ET inspections which does not require tubes to be as clean as other techniques. Our professional inspectors are cross trained to provide both ET and RFT while on site.

Near Field Testing (NFT)
NFT is used for inspecting fin fan (air coolers) designed tube bundles. Also available in our standard ET equipment platform, NFT is a very reliable technique to determine ID anomalies - such as inlet erosion, corrosion, and pitting - that normally occur during service in this previously difficult to inspect tube design.
Internal Rotary Inspection System (IRIS)
IRIS uses ultrasonic technology with a rotating transducer to deliver quantifiable data on the ID or OD damage to tubes. Primarily used as a prove up tool, IRIS requires tubes to be cleaner than other tube inspection techniques and scan speeds to be slightly slower. Also available in our ET equipment platform, all IRIS tube data is presented in a C-Scan and B-Scan profile & archived for playback.
Eddy Current Testing (ET)
ET is the predominant inspection technique for the alloy tubes. ET does not require the tubes to be as clean as some other techniques and is relatively fast compared to more quantitative techniques like IRIS. MISTRAS’ tube inspection specialists utilize the latest ET technology along with an electronic reporting format that allows for quick analysis and generation of tube sheet drawings and results in an easy to read template.

3-D Reporting
MISTRAS tube inspection reports are revolutionary in their ability to provide defect data down the length of the tube. The tube data allows owners the increased ability to determine the root cause of tube degradation and potentially allows them to avoid the problem in the future through operating procedural changes or change in tube material choice during bundle repair. All tube inspection data is left on site in order to speed the process of getting the exchanger into production as quickly as possible. Tube inspection specialists review all on-site data & provide the final report to the client within 72 hours of the completion of the project.
Heroes Wanted: At MISTRAS, we protect critical assets. Sound familiar? Current openings include: Technicians, Engineers, Programmers, Inspectors. Make our mission your next. Read more...
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