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Shandong
Province,
China,
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山东省青州市开发区电商大厦
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1.4.2 The torque to make up (or break out) will increase due to rotational inertia
of the tongs head, but will decrease due to friction. To simplify calculation, data of
Table 2 are thought to be the result of the two kinds of torque canceling out each
other (actually, drill pipe can be tightened up with high speed torque due to
rotational inertia of the tongs head at rated speed).
1.5 Applicable Pipe O. D.
1.5.1 There are four sizes of the tongs head's laws for five sized pipe) . D.,
Jaws 8", 51/2", 5", 41/2", 31/2" for five pipe O. D. (each provided with five
sizes of rollers). They are 8", (
φ
203-
φ
183 mm) drill dollar, 51/2" (
φ
178-
φ
158 mm)
drill pipe joint, 5"(
φ
162-
φ
142mm) drill pipe joint, 41/2" (
φ
146-
φ
126 mm) drill pipe
joint, 31/2"(
φ
121-
φ
101 mm) drill pipe joint.
1.5.2 Max. Wear allowance is 20 mm for each size of drill pipe joint, eccentric
wear allowance is 5 mm.
1.5.3 The total length of drill pipe box and pin should not be less than 420 mm.
1. 6 Pneumatic cylinder for shifting the tongs
Max. stroke 1500 mm
Forward pushing force 2. 36 kN (p=O. 6 MPa)
Backward pulling force 1. 71 kN (p=0. 6 MPa)
1.7 Overall size and weight
The tongs (LxWxH) 1700 x 1000 x 1400mm (including the height of suspension
rod)
The tank (LxWxH) 1560 x 1060 x 1 190 mm
Weight of the tongs 2400 kg
Total Weight 4000 kg (including the tong and the tank)
2. Operation Range
2.1 In Tripping Operation
For drill pipe make up and break out when the torque is less than 100 kN. m
2.2 For Kelly joint make up and break out during drilling.
2.3 For 8" drill collar make up and break out.
2.4 For throwing off single.
To throw off single, adjust the suspension rod to keep inclination of the tongs
head corresponding to that of the mouse hole' s, vary the direction of the pneumatic
