Troubleshooter
One important part of the LARS system is docking head. Through docking passes the wire rope form umbilical winch which holds the TMS/ROV locked mechanically and hydraulically.
Docking comprises of cylinders and motors for longitudinal and transverse movement, shock damping, sensors and bullet lock.
Docking head hydraulic diagram
Features of the docking head:
- Safe latching mechanism for the bullet connected to the TMS/ROV.
- Rotation mechanism enabling for alignment, flexibility, and maneuverability during the operation of ROV with the subsea equipment.
- Damping mechanism enabling the ROV is position safely onto deck without damage
As per docking head diagram above pressure is available for filling the accumulators of damping cylinder and bullet lock. The accumulators plays a vital role in maintaining hydraulic pressure, providing energy storage, compensating for pressure fluctuations, and contributing to the smooth and controlled operation of the docking head.
Bullet lock
As the related control lever is operated the bullet cylinder piston will open/extend for locking of the bullet that is connected to the TMS/ROV.
Rotational mechanism
As the related control lever is operated the hydraulic motor is rotated either right or left as required.
The rotational mechanism feature allows for alignment, flexibility, and maneuverability during the connection process of the ROV through bullet to the docking station, as well prevent cable twisting.
Pressure relief valves are fitted in the system to prevent excessive pressure in the system.
Damping mechanism
Damping is engage by a hydraulic cylinder. It is design like a pressurize cushion and provides controlled damping or shock absorption during the connection and disconnection of the docking bullet and docking head. When the ROV approaches the docking head and the docking bullet enters the docking head, there can be some relative motion and impact between the two components.
Therefore damping cylinder helps cushion and absorb these forces, reducing the risk of damage to the docking head, docking bullet, or the surrounding subsea equipment.
