Add: No. 1201, E-commerce Building, Qingzhou City,
Shandong
Province,
China,
262500
Tel/Fax:
+86-536-3027478
山东省青州市开发区电商大厦
1201
号
Email:
Http://
www.sdbeyondpetro.com
5. Adjustment of torque and speed of tongs heads.
5.1 The speed of the tongs, the speed of the tongs head is proportional to the
flow of oil pump sup-ply. It is adjusted before delivery.
5.2 The torque of the tongs head, the torque of the tongs head is proportional
to the pressure of hydraulic system. To adjust it, shift the tongs onto well head to
hold the joint, operate the tongs with high speed to make up until the tongs head
stop rotating, turn off the overflow valve for making up, adjust the overflow valve of
the oil tank to a set pressure (that is a set torque), than turn on the overflow valve
for making up and adjust the pressure of making up to the set valve (i. e. to the set
torque of making up).
Note: Don' t adjust the pressure at low speed, because the torque of low speed is
too large, it will cause damage of the joint.
6. Operating Regulations.
6.1 Turn on the valve of airline from drilling rig to the tongs. (Put the valve on
driller' s console if possible)
6.2 Start oil pump and turn on the one-way air valve to make the oil pump run
idly, meanwhile, the reading of the pressure gauge should not exceed 1. 5 MPa.
6.3 Check on whether the size of jaw is in correspondence with the size of dril1
pipe sub. If it is put the two locating handles (serial numbers are 4, 37 in Fig. 1) to
the position according to making up or braking out.
6.4 Operate the bi-directional air valve of the shifting air cylinder to move the
tongs to well head smoothly, do not turn on the air valve completely, otherwise, the
tongs will quickly move to wellhead and lead to an impact. If the level of the tongs is
wrong, operate the 3t hand hoist to adjust it to a suitable position.
6.5 After the drill pipe goes into the notch of the tongs head, observe whether
the two plug screws of the upper and lower tongs are contacting closely to the pin
and box of drill pipe respectively, then operate the bi -directional air valve of the
gripping air cylinder to make the lower tongs to hold the joint, put the handle of the
bi-directional air valve to "O" position and release the air.
6.6 According to the need of making up and breaking out, put the handle of the
bi - directional Air valve to relevant position, there is no necessary to shut down in
changing speed.
6.7 Operate type "H" hand- reversing valve to control the motor running forward
and backward, change the position of hand- reversing valve according to the need
