Recommendations DTH Hammers for ODEX

1. Torque requirement:

Drill rigs must have sufficuent torque for drilling with ODEX.

This table shows minimum required torque for the various ODEX sizes.

ODEX	90	115	140	165	190	240
Minimum torque, Nm	900	2000	3000	4000	>5500	>5500

2. Rotation speed:

Rotation speed depends on the size of the ODEX bit and also on the formation being drilled.

The rotation speed may have to be varied as the formation changes. The table shows recommended rotation speeds for the various ODEX sizes.

ODEX	90	115	140	165	190	240
Speed, r/min	20-30	20-25	15-20	15-20	10-15	10-15

3. Drilling depths:

Obtained casing driving depth with ODEX depends on factors such as type of formation, available drilling equipment, and the drill crew’s experience. Experience has shown that below and even deeper holes can be drilled with ODEX.

ODEX	90	115	140	165	190	240
Maximum hole depth in soil, (m)	60	100	100	100	100	100

4. Air pressure:

Maximum recommended air pressure is 14 bar for the DTH hammers.