Safety 1st Advancer Manual do Operador descarregar pdf (Página 75)

Environmental Remediation Drilling

Safety Guidelines

Page 75 of 132

4.10.3 - Sheaves

Inspect and lubricate sheave wheels, shafts, and pins often. Use the proper sheave diameter and width to match

the hoist line that runs over it.

• Most sheaves on drill rigs are stationary with a single part line.

• Replace worn sheaves or worn sheave bearings.

4.10.4 - Cat Head Safety

The following safety procedures should be employed during cathead operation:

• Only drilling personnel familiar with cathead operation should be allowed to operate equipment.

• Keep the cathead clean and free of rust and oil and grease.

• The cathead should be cleaned with a wire brush if it becomes rusty.

• Check the cathead periodically, when the engine is not running, for rope-wear grooves. If a rope groove

forms to a depth greater than 1/8 inch (3 mm), the cathead should be replaced.

• Always use a clean, dry, sound rope. A wet or oily rope may grab the cathead and cause drill tools or

other items to be rapidly hoisted to the top of the mast.

• Should the rope grab the cathead or otherwise become tangled in the drum, release the rope and sound

an appropriate alarm for all personnel to rapidly back away and stay clear. The operator should also back

away and stay clear. If the rope grabs the cathead, and tools are hoisted to the sheaves at the top of the

mast, the rope will often break, releasing the tools. If the rope does not break, stay clear of the drill rig

until the operator cautiously returns to turn off the drill rig engine and appropriate action is taken to

release the tools. The operator should keep careful watch on the suspended tools and should quickly

back away after turning off the engine.

• Do not operate the cathead in rain.

• The rope should always be protected from contact with all chemicals. Chemicals can cause deterioration

of the rope that may not be visibly detectable.

• Never wrap the rope from the cathead (or any other rope, wire rope, or cable on the drill rig) around a

hand, wrist, arm, foot, ankle, leg, or any other part of your body.

• Always maintain a minimum of 18 inches of clearance between the operating hand and the cathead drum

when driving samplers, casing, or other tools with the cathead and rope method. Be aware that the rope

advances toward the cathead with each hammer blow as the sampler or other drilling tool advances into

the ground.

• Never operate a cathead (or perform any other task around the drill rig) with loose, unbuttoned, or

otherwise unfastened clothing or when wearing gloves with large cuffs or loose straps or lacings.

• Do not leave a cathead unattended with the rope wrapped on the drum.

• Position all other hoist lines to prevent contact with the operating cathead rope.

• When using the cathead and rope for driving or back-driving, verify that all threaded connections are

tight and stay as far away as possible from the hammer impact point.

• The cathead operator must be able to operate the cathead standing on a level surface with good, firm

footing conditions without distraction or disturbance.

• Never use more wraps of the rope than are required to hoist the load. Extra laps can lead to the rope

feeding on to the drum by itself resulting in entanglement.

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