Nozzle-to-pipe inspection from the nozzle side

Frédéric Reverdy

Senior Application and Products Engineer

A while back we posted an article showing the application developed for Capture (GEKKO and MANTIS software) for the inspection of nozzle-to-pipe from the pipe side. With their three encoder inputs and the possibility to define nozzle onboard the GEKKO/MANTIS offer an easy-to-use solution for the inspection of nozzles helping operators position their probe and interpret indications.

Capture has been recently updated (version 2.2) to allow the possibility of positioning the probe on the nozzle itself. All probes can be used, linear, matrix, DLA and DMA; all the delay laws are accessible and calculated on the instrument. For trajectory, a one-axis encoder can be used to rotate along the nozzle; it is also possible to use a virtual clicker to increment the position along the nozzle axis.

We used a 10L32-G1 probe (equivalent to A10) with S55 wedge to inspect the same nozzle (designed by TWI) as the one described in the other article. We present here the results obtained for few defects.

The first defect is a 3-mm lack of penetration along the axis of the main pipe. The following result shows the sectorial scan in the 3D view of the component. Capture allows to fold the data, which allows positioning correctly the defect along the backwall of the pipe. Height measurement is possible for characterization. We can see the corner echo from the nozzle followed by a mode conversion.

The second defect is a 3-mm crack in the heat affected zone located at 40° around the nozzle. The folded sectorial scan positions correctly the corner echo and the weld root. The tip diffraction is also visible allowing characterization of the defect.

The third defect is a 3-mm center line crack. Again the sectorial sscan is represented folded off the backwall of the nozzle. It is possible to see two diffraction echoes allowing measurement of the defect height.

Finally we illustrate one of the features of CIVA Analysis, which allows exporting data from different files in the 3D view of the component. We look at a lack of root fusion located at 90° around the nozzle from the pipe and from the nozzle. The view on the left is obtained with a probe located on the main pipe. It is possible to see the corner echo from the nozzle and the LOF. The same defect is viewed with the 10L32 probe positioned on the nozzle.

The two sectorial scans are exported in the 3D view of the component. We adjust the transparency level and the palette threshold to see clearly the corner echoes from the two Sscans. We can see that the two echoes are perfectly superimposed and confirm the existence and position of the defect.

This Capture update is of course free of charge for all GEKKO users (current and future) and Mantis who have the Expert package.