When troubleshooting a travelling block in drilling operations, focus on inspecting key components like sheaves, clevis pins, shafts, and the hanging arrangement, checking for excessive wear, cracks, misalignment, and proper lubrication, while also verifying the functionality of safety devices and ensuring the drill line is correctly installed and maintained to avoid issues like sudden load drops, uneven lifting, or inability to properly raise or lower the drilling string.
Common issues and troubleshooting steps:
- Sheave wear and damage:
- Inspection: Regularly check sheave grooves for wear, cracks, and deformation using a sheave gauge.
- Action: Replace worn sheaves or repair minor damage as needed.
- Clevis pin wear and cracks:
- Inspection: Check clevis pins for excessive wear, cracks, and proper fit within the clevis.
- Action: Replace worn or damaged clevis pins.
- Shaft issues:
- Inspection: Look for cracks, bends, or excessive wear on the shaft.
- Action: Replace the shaft if damaged or worn beyond acceptable limits.
- Misaligned sheaves:
- Inspection: Verify that the sheaves are properly aligned and not wobbling.
- Action: Adjust the alignment as necessary.
- Improper lubrication:
- Inspection: Check grease fittings for proper lubrication and functionality.
- Action: Grease all moving parts as per manufacturer’s recommendations.
- Drill line issues:
- Inspection: Check for damage, kinks, or improper installation of the drill line on the sheaves.
- Action: Replace damaged line or adjust the installation to ensure proper reeveing.
- Safety device malfunction:
- Inspection: Test the crown safety device to ensure it functions properly and activates at the correct position.
- Action: Repair or replace malfunctioning safety devices.
- Excessive vibration:
- Inspection: Check for uneven load distribution or issues with the hoisting system.
- Action: Adjust the load distribution or address issues with the hoisting system.
Important considerations:
- Regular maintenance: Perform routine inspections and maintenance on the travelling block, including checking for wear and tear on all components.
- Proper lifting procedures: Follow safe lifting practices and ensure the load is within the rated capacity of the travelling block.
- Qualified personnel: Only trained personnel should operate and maintain the travelling block.
- Documentation: Keep detailed records of inspections, repairs, and maintenance activities.
