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Conduct a Bore - 88<br />
Remove Pipe<br />
JT5 Operator’s <strong>Manual</strong><br />
Remove Pipe<br />
NOTICE: If engine is shut off during backreaming, drill pipe clamped by wrenches but not connected to<br />
saver sub can be pulled downhole as vise wrenches loosen.<br />
1. Stop carriage when pipes are aligned in wrenches.<br />
2. Clamp pipe in front wrench. See page 78.<br />
3. Clamp and rotate rear wrench to break front joint. See “Wrench control” on page 25.<br />
4. Disengage rear wrench.<br />
5. Unscrew front joint.<br />
• Slowly rotate spindle counterclockwise to unscrew pipe. Move carriage back slowly until threads<br />
unscrew.<br />
• Move carriage back until pipe is properly positioned in rear wrench.<br />
6. Break rear joint.<br />
• Engage rear wrench.<br />
• Slowly rotate spindle counterclockwise until joint is loosened. Do not fully unscrew joint.<br />
• Disengage rear wrench.<br />
• Move carriage back and grip pipe with both hands.<br />
• Pull pin end of pipe clear of saver sub, lift pipe and stow it in box.<br />
7. Lube front threads.<br />
8. Attach saver sub to next pipe.<br />
• Move carriage forward until saver sub touches pipe.<br />
• Rotate spindle to screw onto pipe. Slowly tighten joint to full machine torque.<br />
9. Disengage front wrench to release pipe.<br />
CMW