Trashrack Inspection

Planys conducted underwater visual inspection of several sections of a dam in North India in extremely cold weather making it impossible for human divers to function. The mountain region surrounding the plunge pool had  eroded and client wanted to understand the extent of the erosion.

Scope of Work: The scope of work included underwater inspection of spillway structure, trash racks, reservoir gates and piers, decanting chamber, power intake and plunge pool area. It took 160 dives to conclude the entire operation.

Planys Solution: The inspection was performed using Planys’ ROV Orca equipped with high resolution camera, altimeter and depth sensor.

  • About 90 anomalies were identified and categorised into minor, moderate and major based on the size that included cracks, surface deformations, pinholes and debonding between layers.
  • All anomalies/defects were plotted against geo-tagged CAD drawing of every section on the Planys Analytics Dashboard (PAD) with localised click-to-view video feature. The report helped the client plan repairs and maintenance.

Images show deployment at decantation chamber & site setup of the ROV system during inspection

Images show defects like crack on the wall & debris at the trash rack

“Hot-spot” map showing concentration of anomalies