Effective Inspection of Insulated Structures
Pulsed Eddy–Current (PEC) is an NDT method for corrosion monitoring and for wall thickness measurement.
During a PEC inspection there is no need for direct contact with the object being tested. Measurements can be made through coatings, insulation materials, weather sheeting and even corrosion products.
How It Works
A PEC probe is placed by the wall that is to be inspected and an electric current is introduced in the transmitter coil, which magnetizes the steel.
When the current is switched off, the steel demagnetizes.
This sudden change in the magnetic field strength generates eddy currents in the steel, which diffuse inwards from the steel surface, decaying in strength as they do so.
These decaying eddy currents induce a field that is detected by receiver coils in the PEC probe.
The signal detected is directly related to wall thickness.
Areas of Application: Topsides
- Insulated and/or coated equipment
- Objects under high temperature conditions
- Heavy corroded equipment
- Offshore risers and caissons
- Objects behind concrete fireproofing
- Annular rings
- Ship Hulls
- Seawall Bulkheads
Areas of Application: Subsea
- Underwater risers and caissons
- Concrete pipes
- Underwater Pipes
- Other underwater structures
- Underwater hull