Pulsed Eddy Current
Pulsed Eddy Current (PEC) is a non-destructive examination technique used to screen for corrosion in ferrous materials. It is also used for measuring the thickness of ferrous materials through insulation, lagging, or coatings. PEC can be used on insulation thickness up to 12” with a 4” wall thickness. PEC is typically used to identify the following conditions:
-Corrosion Under Insulation (CUI) on piping and tanks
-Flow Accelerated Corrosion (FAC) on feedwater piping & tanks
-Corrosion under Fireproofing (CUF) and coatings
With PEC, surface preparation that is typically needed for other inspection methods like ultrasonic testing is not required. The part to be inspected can be covered with insulation & lagging, coatings, have a rough surface, rust or flaking paint. Because of this, pulsed eddy current is a fast and cost-effective screening inspection tool.
Pulsed eddy current on its own merits cannot be a direct substitute for an existing non-destructive testing method; however, is considered a valuable screening tool to pinpoint areas of interest for further investigation. During inspection, any suspect areas will be marked out for follow-up inspection. For example; when inspecting for FAC on piping, an area identified by pulsed eddy current as having notable wall loss would be marked out for insulation removal and followed up with ultrasonic thickness testing to verify the extent of wall loss.
5 Star Testing, Inc. can also perform the follow-up inspection, such as prepping the surface for inspection and performing ultrasonic thickness testing (UTT).