Dando Drilling International Ltd

Hollow spindle|Rotary head|for offshore

The Dando MK 500 incorporates a 150mm I.D. hollow spindle mounted on taper roller bearing and is fitted with a worm and wheel gear totally enclosed in an oil bath case.

The head can then be powered by a single piston motor providing controlled rotation and torque in forward or reverse.

General Specifications

Estimated Shipping weight: 438kg
Gear Oil: 8 litres EP Gear Oil Grade 80/90
Hydraulic Oil: Shell Tellus 46 or equivalent
Maximum Pullback: 24 tons.
Estimated shipping dimensions: 1m x 0.8m x .7m

DOWNLOAD BROCHURE

PISTON MOTOR ARRANGEMENTSINGLE GEAR MOTOR ARRANGEMENT All Information With reference to our 24 tonne 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:

20:1 Ratio
Maximum RPM 200 @ 3380 Nm (35cc/rev)
Maximum Torque 7725 Nm @ 87 RPM (80cc/rev)
15:1 Ratio
Maximum RPM 266 @ 2534 Nm (35cc/rev)
Maximum Torque 5793 Nm @ 116 RPM (80cc/rev)
12 ½:1 Ratio
Maximum RPM 319 @ 2112 Nm (35cc/rev)
Maximum Torque 4828 Nm @ 139 RPM (80cc/rev)
10:1 Ratio
Maximum RPM 400 @ 1690 Nm (35cc/rev)
Maximum Torque 3862 Nm @ 175 RPM (80cc/rev)

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.