Load Path Welds
Mast Structure
Clean and inspect each weld area systematically as you move up through the mast.
- Look at each weld, top and bottom, for any deformities in the structural components where they may have been impacted.
- If reinforcing plates or angles have been stitch welded to the main structure, look for build-up of rust and corrosion that may be forcing the surfaces apart.
- Check welds on attachment and hangers that may be installed for hoist sheaves.
- Structural members that support top drive rails or similar equipment should be checked for damage resulting from vibration or misalignment.
Raising Line Sheaves
- Look for bending or cracks in the sheave bearing shaft where it is attached to the main structure of the mast.
Crown Base
- Inspect pad eyes and other attachments to the bottom of the crown block.
- Bumper block retainers can be damaged from incidental contact and could present a dropped object hazard.
- Check for deformation in crown base beams and water table connection plates on top of the mast or derrick legs.
Knowledge Check Choose the best answer for the question.
11-12. What should you suspect as the cause that may be forcing the surfaces of stitch welded reinforcing plates or angles apart?
You forgot to answer the question!