Tone Top 200
The Tone Top 200 was provided to MRD through Japanese AID,1981 and is equipped with rotary mud drilling and 5 ½" down the hole equipment. This drill rig is also equipped with 500 cfm airmen compressor. Casings of 6" and 8" in diameter have been installed using 12 ¼", 9 5/8" and 7 7/8" roller bits. With down the hole hammer, 5 ½" hammer is initially used and the hole is enlarged by reaming with a larger roller bit.
Some of the features of Tone Top 200 is given below:
|Depth (m)||Size of drill pipe|
Swivel Head (Drive Head)
Rotating Speed (rpm)
|Torque||Hyd. Pressure (kg/cm2)|
Supportable Load : 6,000 kg
Type: Twin Hydarulic Cylinder chain feed
Max. Thrust power: 6,000 kg at hydraulic pressure 170 kg/cm2
Model & type: Tone model "NAS-5H" heavy duty double, reciprocating mud pump
Rated Capacity: 600 L/min
Max Pressure: 25 kg/cm2
A 60m borehole can be drilled in two shifts using hammer method, while it will take 3 days to complete a 60m borehole using mud rotary drilling method.