Ditch Witch JT25 - Manual (Page 68)

JT25 Manual
Prepare - 67
Plan Bore Path
CMW
Recommended Bend Limits
Ditch Witch drill pipes are designed to bend slightly during operation. Slight bending allows for steering and
correcting direction. Bending beyond recommended limits will cause damage that might not be visible. This
damage adds up and will later lead to sudden drill pipe failure.
Pipe Pitch
Ditch Witch drill pipe is tested to bend at a maximum
percent pitch.
Make sure pitch (A) changes no more than 6.5% over the
full length of each pipe.
Monitor the pitch of each pipe with the tracker remote display on the operator’s console.
Bend Radius
JT25 drill pipes have a tested minimum bend radius of
155’ (44.2 m). This means that a 90-degree bend in the
bore path:
• has a radius (A) of 155’ (44.2 m)
• requires approximately 243’ (74 m) of drill pipe
(B).
IMPORTANT: Consider recommended bend limits during any bend, not just during bore entry.
NOTICE: Bending drill pipe more sharply than recommended will damage pipe and cause failure over
time. Changes in pitch must be equally distributed over the length of a pipe. Maximum changes in
pitch within 1-2’ (300-600 mm) of pipe create sharp bends that will damage pipe.
NOTICE: Bending drill pipe more sharply than
recommended will damage the pipe and cause failure
over time.
• If bend radius is reduced, drill pipe life is
reduced.
• If bend radius is increased, drill pipe life is
increased.
IMPORTANT: Use the charts on the next page to keep bends within safe limits.