MK 1000 Power Swivel
Description
Similar to the MK 500, this model is fitted with a twin worm and single wheel gear totally enclosed in an oil bath case. Again, the head incorporates a 150mm I.D. hollow spindle which is mounted on taper roller bearings but the MK 1000 is powered by twin piston motors providing controlled rotation and torque in forward or reverse. The loading capacity is also much greater at 40+ ton.
Specification
Twin Piston Motor Arrangement.
With reference to our 40+ton Rigs, Dando Drilling use a valve with a 140lt slice (i.e.70lt motor) and pressure at 315 bar (4568 PSI). Based on this and with a hydraulic piston motor you will see the following speed and torque:
---------------------------------------------------------------------
For 20:1 Ratio
High torque mode:
Torque = 15398 Nm (11317 Lb/ft) @ 43 RPM
High speed mode:-
Torque = 3850 Nm (2830 Lb/ft) @ 175 RPM
For 12 ½:1 Ratio
High torque mode:
Torque = 9624 Nm (7073 Lb/ft) @ 70 RPM
High speed mode:
Torque = 2406 Nm (1768 Lb/ft) @ 280 RPM
---------------------------------------------------------------------
Please note-These are the results when fitted to a Dando type circuit and not the actual performance that the Rotary head and hydraulic motors are capable of. The piston motor can run with a pressure of 420 bar (6090PSI) and an RPM of 5000, therefore results will vary depending on your hydraulic capability.
Twin Gear Motor Arrangement
The torque advised below is a maximum because of the pressure limitation of each motor and the speed is based on 140 Lt.
---------------------------------------------------------------------
For 20:1 Ratio
High torque mode:
Torque = 18984 Nm (14000 Lb/ft) @ 15 RPM
High speed mode:
Torque = 9492 Nm (7000 Lb/ft) @ 30 RPM
For 12 ½:1 Ratio
High torque mode:
Torque = 12373 Nm (9125 Lb/ft) @ 25 RPM
High speed mode:
Torque = 6186 Nm (4562 Lb/ft) @ 280 RPM
---------------------------------------------------------------------
Please note- The 3” Gear motor is limited to 2500psi and is approximately 0.2245 Lt/rev. The motor is capable of 2000 RPM @ 365 Lt/min and performance can vary infinitely depending on the hydraulic supply system. The above speeds and torque figures are based on these details.
GENERAL SPECIFICATION
Estimated Shipping Weight: 630kg
Gear Oil: 18 litres EP Gear Oil Grade 80/90
Hydraulic Oil: Shell Tellus 46 or equivalent
Maximum Pullback: 40 ton.
