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JT5 Operator’s <strong>Manual</strong> Systems and Equipment - 113<br />
Downhole Tools<br />
Backream Fluid Requirements<br />
Backreaming is only successful when enough fluid reaches the bore. The amount of fluid needed depends<br />
on size of bore and soil condition.<br />
Follow these steps to find the minimum amount of fluid needed in perfect conditions.<br />
IMPORTANT: Use more fluid than recommended or the backream might be dry and unsuccessful.<br />
Instructions<br />
1. Find amount of fluid needed for your size of<br />
backreamer. See the table on the next page.<br />
Example<br />
U.S. A 6” backreamer requires at least 1.47<br />
gal/ft.<br />
Metric A 152-mm backreamer requires at least<br />
18.24 L/m.<br />
2. Multiply this number by distance per minute<br />
you plan to backream. The answer is an<br />
estimate of amount of fluid you will need for<br />
each minute of backreaming.<br />
U.S. 1.5 gal x 2 ft/min = 3 gal for each minute of<br />
backreaming.<br />
Metric 18 L x .5 m/min = 9 L for each minute of<br />
backreaming<br />
IMPORTANT: After you have determined how much fluid you will need, see your <strong>Ditch</strong> <strong>Witch</strong> dealer for<br />
nozzle recommendations.<br />
CMW
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