No Contact Inspections
Pulsed eddy current (PEC) technology uses electromagnetic induction to inspect corrosion of ferromagnetic material without the need to make contact with the material’s surface.
Because PEC equipment does not need to make surface contact with the components under inspection, it is ideal for components that are:
- covered by insulation, asbestos, fireproofing, or concrete
- coated with materials like bitumen, polyethylene, or epoxy
- partially or fully submerged in water
- covered in corrosive material, such as rust
- used in high temperature applications
- used to house or transport hazardous material and therefore cannot risk damage that may occur if surface were scoured for testing.
PEC can produce wall thickness measurement with ±10% accuracy through:
- 10” (250mm) of obscuring insulation or fireproofing
- .75” (20mm) of marine growth, coatings, and corrosion.
PEC is less expensive than testing methods that require surface contact because there is:
- no need to remove and restore coatings, paint, or insulation
- no time or money spent removing corrosion, dirt, or scale
- no need for extensive scaffolding since equipment can often be operated through rope access, on extension poles, or by robotic crawlers.
Additionally, monitoring the wall thickness of critical equipment while it is in service extends equipment run times and reduces both the frequency and duration of shutdowns.
Typical applications include inspections of:
- insulated vessels and columns
- insulated storage tanks and spheres
- insulated piping systems
- offshore risers protected by neoprene
- structural applications with fireproofing
- annular rings of storage tanks.
Professionally Trained Techs
Shell Global Solutions developed PEC and has trained and licensed National Techincal Services technicians to use PEC. Shell awarded the license after National Techincal Services proved its technical competence and satisfied their service guidelines.