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Prepare - 56<br />
Recommended Bend Limits<br />
JT5 Operator’s <strong>Manual</strong><br />
Plan Bore Path<br />
<strong>Ditch</strong> <strong>Witch</strong> drill pipes are designed to bend slightly during operation. Slight bending allows for steering and<br />
correcting direction. Bending beyond recommended limits will cause damage that might not be visible. This<br />
damage adds up and will later lead to sudden drill pipe failure.<br />
IMPORTANT: Consider recommended bend limits during any bend, not just during bore entry.<br />
Pipe Pitch<br />
<strong>Ditch</strong> <strong>Witch</strong> drill pipe is tested to bend at a maximum<br />
percent pitch. For JT5 drill pipe, make sure pitch (A)<br />
changes no more than 7% over the full length of each<br />
pipe.<br />
NOTICE: Bending drill pipe more sharply than<br />
recommended will damage pipe and cause failure<br />
over time. Changes in pitch must be equally<br />
distributed over the length of a pipe. Maximum<br />
changes in pitch within 1-2’ (300-600 mm) of pipe<br />
create sharp bends that will damage pipe.<br />
Monitor the pitch of each pipe with the 750/752 Display<br />
on the operator’s console. See page 49.<br />
Bend Radius<br />
JT5 drill pipes have a tested minimum bend radius of<br />
70’ (21.3 m). This means that a 90-degree bend in the<br />
bore path:<br />
• has a radius (A) of 70’ (21.3 m)<br />
• requires approximately 110’ (33.5 m) of drill<br />
pipe (B).<br />
NOTICE: Bending drill pipe more sharply than<br />
recommended will damage the pipe and cause<br />
failure over time.<br />
• If bend radius is reduced, drill pipe life is<br />
reduced.<br />
• If bend radius is increased, drill pipe life is<br />
increased.<br />
IMPORTANT: Use the charts on the next page to keep bends within safe limits.<br />
CMW
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