Kelly drilling, Model ba 250, Technical data – Liebherr LRB 255 User Manual
Page 11: Performance data, Kelly bars
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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