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Top Head Drive System
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Rack & Pinion, (6) Pinion Drive with Adjustable Force Limiter
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Maximum Hook Load
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Standard
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Metric
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Carriage Travel Speed
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500,000 lbs
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226 Tonnes
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44 ft (13.4 m)/ minute
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375,100 lbs
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170 Tonnes
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59 ft (17.9 m)/ minute
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175,000 lbs
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79 Tonnes
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85 ft (25.9 m)/ minute
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125,000 lbs
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57 Tonnes
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120 ft (36.6 m)/ minute
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Motors
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(6) Radial Piston, Dual Displacement
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Brakes
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(6) Spring Applied/Hydraulic Release
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Gearbox
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(6)
Planetary Drive
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Rotary System
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(2) Pinion and Gear Drive with Infinitely Variable Torque
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Maximum Rotary Torque
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30,000 ft-lbs
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Maximum Rotary Speed
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120 RPM
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Rotary Motors
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(2), Axial Piston/Variable Displacement
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Rotary Brakes
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(2), Spring Applied/Hydraulic Release
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Fluid Course
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3 inch (76 mm)
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Maximum Mud Flow Rate
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650 U.S. Gallons ( 2,460 L)/minute
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Maximum Rotary Pressure
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5,000 psi (345 bar)
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Mud Swivel
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Connection
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6 5/8 Pin
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Fluid Course
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5 inch (127 mm) ID
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Maximum Pressure
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5,000 psi (345 bar)
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Maximum Speed
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200 RPM
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Mud Hose
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(1) 4 ½ inch (113. 4 mm)
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Slip Spindle
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5 ½ API-FH Tool Joint Connection
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Sub Saver
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4 ½ HX-API Box X Pin
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Top Head Drive Dimensions
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Standard
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Metric
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Length
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14 ft.
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4.26 m
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Width
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10 ft.
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3.04 m
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Top Head Drive Assembly Total Weight
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46,000 lbs (20,866 kg)
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