Ditch Witch JT1220 User Manual
Page 143
Systems and Equipment - 142
JT1220 Mach 1 Operator’s Manual
Drill Pipe
CMW
Make Up and Break Out Joints Correctly
Assisted Makeup protects threads by automatically matching carriage movement speed to rotation during
makeup and breakout.
•
To screw pipes together and fully torque joint, slowly rotate pipe until spindle stops turning and full
pressure is developed. Improperly torqued joints will damage the shoulder faces and threads, and
will cause joints to leak or break while drilling or backreaming.
•
To unscrew pipes, slowly rotate spindle counterclockwise. Carriage will move back automatically
until threads unscrew.
If assisted makeup is unavailable, follow these two steps:
•
Make up and break out joints slowly. Do not ram pipes together during makeup or force them
apart during breakout. Carefully time rotation with carriage travel speed, and always connect and
disconnect joints slowly and deliberately. This will help prevent thread crossing, galling, and
shoulder swelling.
•
Torque joints fully. Once the joint is connected and the shoulder faces are touching, torque them
to full machine torque. Improperly torqued joints will damage the shoulder faces and threads, and
will cause joints to leak or break while drilling or backreaming.
Do not Overwork the Pipe
Never exceed the bend radius for your pipe. See “Recommended Bend Limits” on page 72. Do not
oversteer.
NOTICE: Bending pipe more sharply than recommended will damage pipe and cause failure.