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Hi Thanks for your reply. The rotary unit is delivered with a lot of options for larger motors than the OMS80 motors that are mounted now. Up to 315 ccm motors can be fitted from the factory, so the torque should not be a problem. In the case of drilling with DTH we will probably use larger...

Hi At my work we have just purchased a drilling rig that has a hydraulic powered rotary unit. The unit has two hydraulic motors, that can be run in series for high speed low torque mode, and in parallell for low speed high torque mode attached to the same shaft. The high speed is used for...

Hi kauri There seems to be several problems with the CPT data that you have posted. The first thing that struck me is the lack of pore pressure responce after the layer at about 2,5 m. I would interpret that as lack of saturation due to cavitation through a dilatant layer at 2,5 m. This...