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The
rigid frame and base design guarantee good stability to the derrick
during reaming. |
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The
electro-hydraulic drive system ensures smooth rotation with shock-free
torque, which gives exceptionally long operational time to both
the raise borer and the drill string, reaming head and cutters.
Indau raise borers are exactly machined to allow for a high energy
input and thus a high power/weight ratio. This means easy transport
and handling, which is especially important in narrow mines and
in helicopter transport in roadless terrain. |
|
Pilot
hole flushing medium is usually water, which can be re-circulated.
Alternatively, air or foam can be used. |
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The
hydraulic drive and control systems ensure troublefree operation
also in underground mines with sulphuric air or high iron dust
levels. |
|
The
well-dimensioned thrust bearing capacity allows for long service
intervals. |
|
The
operating and drive systems are designed in a way that allows
for regular maintenance and service to be performed by the drilling
crew. |
|
| The drilling
of a service hole for a pipeline in the North Sea. Total length
760 m. The hole extends to a depth of more than 300 metres below
sea level. |
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