The HR 420-800 is our largest model, which has been specially designed and built for carrying out works requiring large bore diameters at great depths.
This one of a kind drilling rig can be equipped with different rotarys with different torque values depending on your job requirements. The rotary can also be set up with the MCS (MAIT Casing System) or torque multiplier which can exert a maximum nominal torque of 800 KNm for insertion and extraction on the casing tubes up to a maximum diameter of 3000 mm .
The HR 420-800 is not limited to the conventional kelly bar drilling system, but it is able to utilize Casing Oscillators, Continuous Flight Auger (CFA), Diaphragm Walls by kelly bar system, and Driven piles with hydraulic hammers.
The HR 420-800 is also available with a crowd winch system (THD), which allows a longer stroke along the length of the mast, therefore longer casing sections may be used when drilling.
Pictures
Working characteristics
| Works with Augers & Buckets | ||
| Max Diameter | 3.000 mm | 10 ft |
| Max Diameter with Casings | 3.000 mm (CP version) / 2.600 mm (THD version) | 10 ft (CP version) / 8.5 ft (THD version) |
| Depths | 40 - 50 - 60 - 70 - 90 - 110 m | 131 - 164 - 197 - 230 - 295 - 360 ft |
| Works with Casing Oscillator | ||
| Max Diameter | 2.500 mm | 8 ft |
Technical data
| Rotary | ||
| Nominal torque available | 280 - 360 - 420 KNm | 206,500 - 265,500 - 309,800 lbsft |
| Nominal torque with MCS | 800 KNm | 590,050 lbsft |
| Nominal pull-back/pull-down | 400 KN | 90,000 lbs |
| Unloading speed | 130 rpm | |
| Stroke | 14.500-19.500 mm (THD version) / 7.000 mm (CP version) | 48 - 64 ft (THD version) / 23 ft (CP version) |
| Winches | ||
| Main winch nominal pullback | 300 - 350 - 400* KN | 67,500 - 79,000 - 90,000* lbs |
| Secondary winch nominal pullback | 120 - 180 KN | 27,000 - 40,500 lbs |
| Engine | ||
| brand | CATERPILLAR | |
| Model | C15 | |
| Power | 403 KW @ 2.100 rpm | 540 HP @ 2,100 rpm |
| Hydraulic system | ||
| Hydraulic oil tank | 1.000 liters | 264 gal |
| Fuel tank | 600 liters | 159 gal |
| Crawler | ||
| Total length | 6.400 mm | 21 ft |
| Total width | 3.500 - 5.100 mm | 11.5 - 17 ft |
| Shoes | 1.000 mm | 3.3 ft |
| Weight | ||
| Approx weight | 120 - 135 ton | 264,500 - 297,700 lbs |