TCR Arabia in Saudi Arabia undertakes eddy current testing of tubular products using internal diameter probe coil (bobbin) for non ferrous materials and ferrous materials (with magnetic saturation). The company has a portable unit that can inspect any heat exchanger from the largest power plant condenser to the smallest feed water heater. The eddy current instrument at TCR Arabia is capable of operating at test frequencies upto 8 kHZ with a high speed of 2-Meter Per Second Inspection Speed.
Codes and Standards
- Standard for Qualification and Certification of Nondestructive Testing personnel, ANSI/ASNT CP-189
- ASME Boiler and Pressure Vessel Code Section V Article 8
Priopr to the testing, all tubes must be cleaned. Cleaning shall be done using hydro jetting with typical cleaning pressures between 280kg/m² and 560 kg/cm² . The adequacy of cleaning must be checked by inserting an appropriate dummy probe / rod.
The electronic apparatus used will be capable of energising the test coil with alternating currents of suitable frequencies (for example 1 to 125 kHz) and will be capable of sensing the changes in the electromagnetic response of the coils. The instrument will be balanced with the probe in a defect free position of the calibration tube. The spot will be central on the impedance plane display of screen for differential testing and at one division from the top of the screen for absolute testing.
The expert Eddy Current techinicans of TCR Arabia take the flaw signals generated in tubes under test and then compare it with the signals of the calibration standard.
Documentation And Reporting Of Test Results
Each examination or survey is reported in accurate and detailed manner by TCR Arabia's expert technicans. The following details are reported in each result.
- Test tube details
- Probe details
- Test mode (differential or absolute etc)
- Frequency (or frequencies) used for testing
- Test equipment details
- Scanning speed
- Probe retraction method (hand or mechanical)
- Calibration standard used and method.
- Examination data recording procedure
- Test result interpretation procedure