Liebherr LRB 255 - Manual (Page 11)

LRB 255 11
Kelly drilling
Model BA 250
A
X
1900
Shock absorber for Kelly bar
Display for Kelly drilling
Technical data
Drilling drive - torque 1 st gear 250 kNm
Drilling drive - speed 1 st gear 25 rpm
Drilling drive - torque 2 nd gear 125 kNm
Drilling drive - speed 2 nd gear 50 rpm
Performance data
Max. drilling diameter* 2200 mm uncased
Max. drilling diameter* 1800 mm cased
*) Other drilling diameters available on request. Other Kelly bars available on request.
When using a casing oscillator, value X has to be reduced
by 1500 mm.
Kelly bars
Kelly type A X Drilling
depth
Weight Kelly Ø
(mm) (mm) (m) (t) (mm)
MD 28/3/24 9880 12000 21.8 5.0 419
MD 28/3/27 10880 11000 24.8 5.45 419
MD 28/3/30 11880 10000 27.8 5.9 419
MD 28/3/33 12880 9000 30.8 6.35 419
MD 28/3/36 13880 8000 33.8 6.8 419
MD 28/4/36 11130 10750 33.8 7.0 419
MD 28/4/42 12630 9250 39.8 8.0 419
MD 28/4/48 14130 7750 45.8 9.0 419
MD 28/4/54 15630 6250 51.8 10.0 419