50-28 Operation D20x22 Series II Navigator HDD
Communication Requirements
Swivel Use
The reamer must be equipped with a swivel to prevent trailed rods or product from turning while reaming. If
reamer does not have a built-in swivel, an external swivel must be installed.
Step 1: Grease swivel and check that it turns freely by hand. A tool can be used to initially loosen swivel
rotation. If, after loosening, swivel does not turn freely by hand, repair or replace it. If the product
attached to the swivel rotates along with the reamer, replace swivel.
Step 2: Use correct lockout procedures.
• “Lockout Procedure - With Remote Lockout,” page 30-14
• “Lockout Procedure - Without Remote Lockout System,” page 30-17.
Step 3: Turn drilling fluid system OFF.
Step 4: Remove drill head from the drill string.
WARNING: Proper communication is essential to prevent unplanned
startup of the drill string and/or tool and to coordinate the pull of the exit
site machine to maintain tension on the drill pipe. Serious injury or death
could result. Always follow communication requirements as explained in,
“Radio Communication Requirements.” Refer to page 40-3.
DANGER: Entanglement in rotating drill string can result in death or serious
injury. Rotating trailed string could whip and strike you. A properly functioning
swivel is necessary to prevent the trailing drill string from turning.
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