Safety 1st Advancer Manual del operador descargar pdf (Pagina 44)

Environmental Remediation Drilling

Safety Guideline

Page 44 of 132

Blocking and Cribbing

• Blocking and cribbing is designed to distribute the weight over a larger surface area. When drilling

on non-compacted soil, use blocks of sufficient strength to support the weight of the rig and to

provide a more stable drilling structure. The larger the blocks (length, width, and height) the more

evenly distributed the rigs weight will be and the potential for differential settling will be minimized.

Blocks will more evenly distribute the rig's weight and will prevent differential settling.

• Recheck the status of blocking and cribbing at the beginning of each shift to evaluate stability.

• Locate blocks between the jack swivel and ground.

• Re-level drill rig if settling occurs after initial set-up.

Wheel Chocks

• If the rig is positioned on an incline and leveling of ground is impossible or impractical:

o Chock the wheels of the rig remaining in contact with the ground.

o Chock wheels of all support equipment and trailers.

o It is highly recommended that wheel chocks be used even if the rig is on level ground.

4.1.2 - Overhead Hazards

Contact with overhead obstructions when raising the rig mast can result in property damage, injury, and,

most importantly, loss of life. The most frequent cause of job-related death in the drilling industry is

electrocution caused by contact of the drill rig with overhead power lines. Additionally, contact with

overhead power lines can result in electrical shock and electrical burns. Drilling should not commence

without first determining the risk posed by obstructions such as tree limbs, protruding objects and structures,

and overhead power lines. The proposed drilling location should be inspected by the drilling contractor prior

to setting-up the rig to ensure that all such obstructions have either been removed or that the risk of

contacting such obstructions has otherwise been mitigated. Specific items to consider include the following:

Structures

• Prior to raising mast, review location for the presence of overhead structures, such as canopies, trees,

or piping racks.

• Maintain sufficient horizontal space (approximately 10 ft) between overhead structures and rig to

allow for mast to go past vertical when being raised.

Overhead Power Lines

• Contact the power company for expert advice on drilling in the vicinity of overhead power line(s) at

a specific location and to determine if the power line(s) can be de-energized during drilling

operations. Never assume a line is de-energized - ASK! If in doubt, do not raise the mast.

• Inspect location for sagging power lines before making entry with rig. Never lift power lines to gain

entry to location.

• Note location of overhead utilities on all boring location plans and site work plans. Whenever

possible, locate borings to avoid any possibility of contact with power lines. Walk completely

around the rig to determine what the distance will be between the nearest power line and the mast as

it is being raised and in the raised position

• When drilling near overhead power lines is unavoidable, allow sufficient space between the mast

and the overhead lines. Because of the difficulty in estimating distances from the ground and the

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