Load Path Welds
Substructure
Starting on the bottom, look over the horizontal base beams of the structure.
Start checking welds in the substructure.
- Look for any broken or cracked welds.
- Check for damage that occurred during rig moves, such as bent or torn iron.
- Look for areas of corrosion or rusting where fluid or debris have accumulated.
- Move up through the diagonal bracing looking for cracks or breaks in the main support structure.
- Keep an eye out for torch cut holes or modifications that may jeopardize the integrity of the structure and note them on the form.
In self-elevating structures, look carefully around sheaves and raising lines for damage.
Look for areas where beams have been "boxed in" or have plates welded on them where fluids can become trapped causing corrosion and or freeze damage.
Areas around rotary beams, drawworks support beams, and the dead line anchor should be cleaned and inspected.
Mast Shoes and A-Legs
Clean and inspect the starting leg and A-leg pin assemblies both above and below the rig floor.
- Look for torn welds around guide plates caused by misalignment during rig up/down.
- Closely inspect areas that may accumulate debris and liquids.
- Look for areas where rust build-up between plates is pushing them apart.
- Look for "bulging" of enclosed beams that would indicate freeze damage.
Knowledge Check Choose the best answer for the question.
11-11. When inspecting welds, what does corrosion or rusting indicate?
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