It’s important to do this inspection to ensure that overhead equipment is properly secured to prevent injuries from falling objects.
For more Information: IADC Health, Safety, and Environmental Reference Guide.
List each area of the rig below and check: lights, welds and attachments, safety cables, secured tools, cable or line rubbing, and sheaves. Inspect based on the instructions below and note on the form.
Mast or Derrick
- All lights should be securely mounted and a safety cable attached.
- Counter weight sheaves and hoist line sheaves should be mounted to a dedicated cross member with a 4-part shackle (bolt, nut with keeper pin).
- Chains, wire rope, and soft line used during rig moves should be removed from the derrick to prevent it from becoming fouled in the traveling equipment. Stabbing boards and other work platforms
should be securely attached and have a safety cable for both the track and the fold down platform.
- Wooden bumper blocks under the crown should be wrapped in expanded metal to prevent broken pieces from falling to the rig floor.
- Inspect the horizontal girts for tools or materials that may have been left behind following repairs.
Falling Objects (Continued)
- Inspect the racking board for any broken welds or cracks.
- The board should be straight and show no signs of contact with traveling equipment.
- The board and fingers should have safety chains installed to prevent them from falling if they are broken off.
- Check the board area for loose tools, water bottles, or shackles.
- Inspect the board and fingers for damage from tugger lines where they may be sawing into the iron causing damage.
- Make sure lights, winches, and cameras are properly mounted and equipped with safety cables.
Traveling equipment includes an arrangement of pulleys, or sheaves, through which drilling cable is reeved, which moves up or down in the derrick or mast.
- The block hanging attachment should not have an unsecured shackle or sling riding along with the block.
- Check the areas around the top drive and swivel for tools and loose items.
- Top drive drilling units should be checked for safety wires on the bolts and safety cables on moving parts.
- Inspect die holders to ensure broken dies will not fall to the rig floor.
- Look for areas on the traveling assembly where tugger lines may be rubbing and causing damage.
- Check hinges and pins on access platforms and guard openings.
- Hoses and service loop connections should be secured and safety cables installed.
Falling Objects (Continued)
The substructure is the foundation on which the derrick or mast and usually the drawworks sit. The substructure also contains space for well control equipment..
- Look for loose tools on platforms or on beams above the cellar area.
- Check lights for proper mounting and safety cables.
- Suspended platforms should have a locking device to prevent the loss of scaffold boards, platform pieces, or hand rails.
- Check all fixed shackles and sheaves same as the mast.
Derrick or Drill Floor
The derrick or drill floor is the work area in which the workers conducts operations. This usually includes adding or removing drillpipe to or from the drillstring.
- Areas around the drill floor should be checked for equipment or tools that could be knocked over the side to work areas below.
- Removable handrails that may be snagged when lifting with the hoist should be safety pinned.
- Equipment and tools stored on or hanging from hand rails should be secured to prevent dropped objects.
- Storage areas that are above walking and working surfaces should be properly guarded to prevent items from falling or being knocked off the edge.
Conduct this inspection to ensure that areas around the rig are kept clear to provide safe access for employees and that hazardous conditions are addressed.
Note the name of each area of the rig and inspect for the following issues.
Walking and Working Surfaces
- Inspect areas for oil, grease, mud, and standing water.
- Check that tools and equipment are not left lying in areas where employees are walking.
- Make sure that any mats or absorbent materials used on floors and walkways are clean and lying flat so they do not create a trip hazard.
Stairs and Ladders
Check that they are clear of ropes, hoses, chains and electrical cords. Check hand rails and ladder rungs for grease or mud.
- Check that eating areas are kept clean and food requiring refrigeration is not left out.
- Items left in coolers or refrigerators should be dated and outdated items should be removed and disposed of at least twice a week.
- No food or beverages are to be consumed in areas where chemicals or other contaminants are present.
- Make sure that drinkable water sources are clearly marked and were replenished during the current shift.
- Disposable cups should be provided and the use of a common cup is prohibited.
- Check that individual bottled water is marked by the user after it is opened and partial bottles are disposed of at the end of each shift.
- Water not safe for drinking must be clearly marked.
- Check that toilet facilities are kept clean and are well ventilated.
- Check that vents are screened off to prevent insects and animals from gaining access.
- Food and drinking water are not to be stored in or around toilet facilities.
- Check that an area for cleaning hands is available and working.
- Check that change rooms are clean and well ventilated.
- Wet or damp clothing must be allowed to dry before use.
- Check that the area is free of trip hazards.
- Where employees must change foot wear, a bench or seating area should be provided.
- Look for waste containers around the rig, and check that they are secure from insects/animals and are emptied daily.
- When handling chemical wastes such as sacks or cans, the same PPE used for mixing should be used for waste disposal.
- Check that disposal areas or containers are equipped to prevent trash from blowing around or being scattered by animals.
- If applicable, ensure that waste streams are properly segregated.
Oil Leaks and Overflows
- Check areas where oil leaks, or where drips occur, for proper absorbent material.
- Also check installed catch basins.
- Absorbents should be changed on a regular basis to prevent fire and contamination issues.
- Oily waste should be managed properly to ensure other waste streams are not contaminated if they are to be handled off location.
Do this inspection to ensure that drill string components are stored properly.
Location on Rig
List the areas of the rig where drill string components are stored. Inspect components based on the instructions below and note on the form.
- Racks should be level and have a solid footing.
- The welds on the racks should be inspected for cracks and breaks.
- Where racks are hooked together end-to-end, they should be pinned, or overlapped, to prevent pipe from falling through the connection.
- If racks need to be blocked, they should have support in enough places to prevent bowing or sagging of the structure when the rack is fully loaded.
- Make sure that blocking is not crushed or broken and supports both sides of the rack.
- Ensure that stop pins are in place, straight, and standing upright.
- Racks that are integral to pipe baskets should have the bridging components properly attached and locked into place.
Tubular Storage (Continued)
Stops and Chocks
A system should be in place for blocking and/or wedging the pipe to prevent it from rolling.
- The bottom layer of pipe should be held in position with pins in the pipe rack.
- Successive layers should each have blocking on both ends to prevent movement.
- The chocks can be made of steel, plastic, or wood.
- Whatever the material, the chocks should be nailed or otherwise secured to prevent the pipe from rolling.
Stripping or strapping refers to the material used to separate the successive layers of pipe as they are stacked on the rack.
Stripping may be sections of old drilling line or 2x4’s or 2x6’s and should be a consistent thickness. Whatever is used, it must be sized for the pipe that is being stacked and provide support
for the layers above.
- Do not use stripping to bridge gaps between the pipe and the racks.
- Lower layers of pipe should be tight with no gaps before the next layer is installed.
- The upper layers should not extend beyond the lower layers; the stripping should never be loaded without support from below.
- Stripping should be laid with sufficient overlap to prevent pipe from falling down between sections.
Tubular Storage (Continued)
- Pipe stored on racks should have thread protectors installed at all times.
- The end connections should not be pushed with a forklift or other equipment without thread protectors installed.
Special care must be taken when stacking heavy tubular goods. The preferred method is to only stack drill collars on the first layer.
If drill collars must be moved over drill pipe, the stripping must be strong enough to handle the load – three or more rows of stripping may be necessary.
Down Hole Tools
Special tools may require different handling. All of these tools along with the handling subs should be inspected.
Load Path Welds
This inspection will visually ensure that load path welds are not damaged.
Develop a systematic plan with the crew to conduct a focused visual inspection of the load path. Additional light and tools for scraping and brushing the welds should be available.
The inspection plan should address access to the area, necessary fall protection, and in some cases energy isolation and lockouts. Rig operations may need to be stopped or modified to ensure the
safety of the inspector.
For each major rig component of the load path, note any: weld damage, bent structures, corrosion, cuts or holes, modifications, fluid build-up, and freeze damage. Specific instructions for
each component are below.
Load Path Welds (Continued)
Starting on the bottom, look over the horizontal base beams of the structure.
- 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.
Load Path Welds (Continued)
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.
- 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.
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