Liebherr LRB 255 - Manual (Page 7)

Equipment for kelly drilling
Technical data
LRB 255 7
Kelly drilling
Drilling drive I – torque 1 st gear 184,400 lbf ft
2 nd gear 92,200 lbf ft
Drilling drive I – speed 1 st gear 20 rpm
2 nd gear 40 rpm
Max. drilling diameter
with adapter
9.8 ft
Max. drilling diameter
without casing oscillator
7.2 ft
Max. drilling diameter
with casing oscillator
5.9 ft
Line pull kelly winch 45,000 lbs
Line speed kelly winch 0 –295 ft/min
Ñ
Transport dimensions Working dimensions
Kelly type L Weight L
1
R Drilling depth
ft lbs ft ft ft
3/24 32.8 13,250 78.7 36.1 72.2
3/28 36.1 14,550 91.9 32.8 85.3
3/32 41.0 16,100 104.9 27.9 98.4
3/36 44.3 17,600 118.1 24.6 111.5
4/48 45.9 18,750 157.5 22.9 150.9
4/65 57.4 23,150 213.3 11.5 206.7