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Subsea Pipeline Cleaning at Adani Thermal Power Station – Powered by Our Custom-Built ROV

Cleaning of 1.1 km Subsea Cooling Water Pipeline

Technology Used: Custom Remote Operated Vehicle (ROV) with Brush & Jet System + Pipeline Profiling Sonar

The Challenge

At Adani’s coastal thermal power station in Udupi, uninterrupted seawater intake is critical for condenser cooling. However, a major operational hurdle emerged when their 1.1 km long, 1.4-meter diameter subsea pipeline—running from the pump house to the sea—became completely choked with sand.
With only a single point of access via a manhole located onshore, traditional cleaning methods were not an option. That’s when SeaDogs Pvt. Ltd. was brought in to engineer a solution.

Our Innovative Solution

We responded by designing and building a Remote Operated Vehicle (ROV) tailored specifically for this mission.

Key Features of the ROV:
  • Dual-directional rotating brushes (forward & aft), adjustable in height
  • High-pressure water jets to break down compacted sand
  • Submersible slurry pump to evacuate loosened sediment
  • Pipeline profiling sonar for real-time internal mapping (since cameras were ineffective in murky conditions)

    To deploy the ROV, a custom platform was lowered into the manhole and aligned perfectly with the pipeline. The machine was placed gently on this platform and driven remotely throughout the entire 1.1 km stretch. All functions—from movement and brush rotation to jet activation and sonar scanning—were operated from the surface.Add Your Heading Text Here

    • The Execution
    The entire solution—from concept and design to fabrication, testing, and field deployment—took around six months. Our team navigated the technical and environmental challenges with precision. As the ROV dislodged the sand, the slurry was collected at the manhole exit. We then used high-capacity pumps to return the sediment-laden water safely back to the sea.

    The Result
    We successfully restored full flow through the entire subsea pipeline without a single diver entering the system. This project stands as a testament to our ability to tackle complex underwater problems using intelligent, remote-controlled systems.