Ditch Witch JT922 - Manual (Page 113)

Systems and Equipment - 112
JT922 Operator’s Manual
Downhole Tools
CMW
Backream Fluid Requirements
Backreaming is only successful when enough fluid reaches the bore. The amount of fluid needed depends
on size of bore and soil condition.
Follow these steps to find the minimum amount of fluid needed in perfect conditions.
IMPORTANT: Use more fluid than recommended or the backream might be dry and unsuccessful.
Instructions Example
1. Find amount of fluid needed for your size of
backreamer. See the table on the next page. U.S. A 6” backreamer requires at least 1.47
gal/ft.
Metric A 152-mm backreamer requires at least
18.24 L/m.
2. Multiply this number by distance per minute
you plan to backream. The answer is an
estimate of amount of fluid you will need for
each minute of backreaming. U.S. 1.5 gal x 2 ft/min = 3 gal for each minute of
backreaming.
Metric 18 L x .5 m/min = 9 L for each minute of
backreaming
IMPORTANT: After you have determined how much fluid you will need, see your Ditch Witch dealer for
nozzle recommendations.