raisebore

SCHEDULE B - Technical Data of Robbins 73R Raiseborer

  1. Connected power
    • Mains supply 415 Volts, 50 Hertz, 500 KVA
    • Diesel Genset supply 650 KVA unit with appropriate Load Bank if necessary
  2. D.C. type machine
  3. Compact design - 5.8m *1 extended height plus beams
  4. Pilot thrust - 470 KN (106,000 lbs)
  5. Reaming thrust - 3,830 KN (860,000 lbs) operating
  6. Reaming torque - 225 KNm (166,000 ft lbs) operating
  7. Pilot Drilling speed 0 - 70 rpm variable
  8. Reaming speed 0 - 19 rpm variable
  9. Transporter - pneumatic tyred sled with inbuilt erection device
  10. Beams to allow hole break through (if required)
  11. Air consumption 23m3/min @ 7 bar (800 cfm @ 100 psi)
  12. Water consumption:
    • cooling approximately 75 litres/min (15 gpm @ 100 psi)
    • pilot drilling approximately 700 litres/min (150 gpm @ 100 psi)
  13. Raiseborer weight - 11.5 tonnes
  14. The combined weight of the raiseborer and transporter is 19.2 tonnes

Note: If directional drilling method is used a further 500mm needs to be added to the extended height of the rig for high capacity water swivel.

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