Correct Startup Sequence for Dredgers

Cutter Suction Dredger

For large-scale dredging equipment like dredgers, proper maintenance and management are essential as any equipment failure can significantly impact the progress of the construction. Here, we will introduce the correct operational sequence for dredgers.

1. After starting the engine, let it idle for approximately 10 minutes until the water temperature, oil temperature, and oil pressure reach the specified requirements before commencing production.

2. Prior to activating the sand pump, the personnel should turn on the 24V power supply switch on the control cabinet..

3. Lower the ladder winch, ladder, and suction pipe to submerge the cutterhead into the water. Start the flushing pump for flushing.

4. Engage the gearbox and sand pump by operating the switch on the control panel, allowing the engine to drive the gearbox and activate the sand pump. Gradually increase the engine speed to the specified rpm. Throughout the operation, the engine should not be engaged at high speeds.

5. Once the sand pump has drawn water and the discharge pipe is functioning properly, the cutterhead can be activated for production by using the lateral movement.

Note: During the dredging process, the positioning piles should never be inserted into the sediment while performing radial movements. If the sand pump needs to be temporarily stopped, reduce the engine speed to disengage the sand pump and gearbox.

During the production process of the dredger, the personnel in the engine room should observe the conditions inside by using their senses. They should check for any unusual smells, listen for any abnormal noises, observe the engine monitoring instruments for normal operation, inspect the hydraulic system for oil leakage, check the cooling system for water leakage, and monitor for any signs of the engine's three leaks: water, oil, or air. They should also assess the temperature and vibration of moving parts.

When the dredger is not in production, the engine should be stopped by raising the ladder winch to lift the cutterhead from the sand layer. Then, continue pumping water to flush out any sediment from the entire discharge pipeline. Reduce the engine speed to stop the sand pump. Lift the dredger's ladder and ensure it is above the water level before securing it with safety measures.

Only after completing these steps should the engine be stopped. During departure, the seabed valve, as well as other valves, should be checked and closed. Power should be disconnected, and windows and doors should be closed.

This covers the basic information regarding the correct startup sequence for dredgers. We hope that the provided details will be helpful to you.