Function: This tool can be connected to the column for torque transmission, it can support pressure
and tension. If the fishing tool has been jammed or malfunction to release the fish, it’s easy to
unscrew this joint by the pressure and the tension. And take the pipe back over the safety apparatus
joint, then salvage the pipe back under the safety apparatus joint.
Applicable documents: SY5067-91
operating principle: The back off safety apparatus joint on the boring tool transmitting
torque and bearing pressure by the friction of the against pushes link and the end face of up
and down joint, bearing tension by the square screw thread. If you want to dismount
the safety apparatus joint when using reversing tool, must close the reversing tool before
unscrewing it. In accordance with the operating instruction of reversing tool, you can unscrew the
reversing safety apparatus joint by 90-150KN.
the type and main parameter of Back Off Safety Apparatus Joint
|
type |
O.D. mm |
connection |
KN.m torque |
type of reversing tool |
process of exit tool |
|
DANJ-95LH |
Φ95×580 |
2 7/8REGLH |
11 |
Φ95 |
D-Drill, the mention |
|
DANJ-105LH |
Φ105×580 |
Nc31LH |
21 |
Φ105 |
D-Drill, the mention |
|
DANJ-148LH |
Φ148×580 |
Nc38LH |
48 |
Φ148 |
D-Drill, the mention |
