Laboratory analysis is often a key component when discerning fitness for service of various equipment and components. Over time, environmental or mechanical deterioration of materials can occur. Or, conversely, the samples may be in pristine condition after many years of service because they are compatible with and have sufficient corrosion resistance to the environment in which they were placed. Further, routine condition assessment of equipment can ensure that implemented operational or material modifications have resulted in the intended improvements. These assessments can include CTL personnel on-site or samples routinely provided to the lab. A few methods or analyses that are commonly associated with condition assessments include the following:
- Corrosion depth and remaining effective wall assessment, either through destructive metallurgical section evaluation or in situ UT thickness evaluation.
- Annual Inspections for examination and documentation of condition.
- Boiler tube cleanliness assessment via deposit weight density (DWD) testing.
- Coating integrity assessment, including thickness testing, adhesion testing, and electrochemical impedance spectroscopy (EIS).
- Graphitic corrosion assessment of cast iron pipe sections.