Pull Through Testing
Pull Through Testing (PTT)
Pull through Test is carried out by pulling the inspection tool through the test pipe by means of hydraulic or manual winch. The tool is moved at constant velocity of 0.3-2 m/sec. On the test pipe, artificial models of defect types of different sizes are applied. Dimensions of the defects are accurately measured. Tool is switched to operating mode during the test and after the test, the received data is analyzed and hence calibration achieved.