The highly specialised non-destructive testing project was carried out in conjunction with our partnering company and the chosen NDT discipline was Magnetic Flux Leakage (MFL), to locate and measure pin holing, graphitisation levels and thickness of remaining material on surface run pipes, submerged risers and submerged pipe sections.
An ultrasonic wall thickness probe and MFL system was designed specifically for the project and was used by our divers working within a flooded shaft to assess the condition of the riser; the non-destructive testing probe was subsequently mounted on a medium range PIV to assess the condition of sections of the pipe that were running through the flooded tunnel.
To meet project specific requirements, we modified one of our ultrasonic wall thickness probes to measure HDPE pipe wall thickness and designed and built a remote manipulator arm and cleaning head to fit a small diameter PIV’s to facilitate the inspection and remote non-destructive testing of a 400m long HDPE pipe section which formed an extension to the existing outfall.
Working from a GPU vessel, the PIV was launched into the outfall by our dive team and the control cable tended by a diver throughout the survey.
The project was entirely successful and provided the Client with the level of information they required for future planning of outfall remedial programme.