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
8. Commonly Troubleshooting
Trouble
Probable Cause
Correcting Action
Upper tongs or
low tongs fail to
grip in making
up or breaking
out
1.Long time service of the
dies, worm and torn, blunt.
2.Die groove being filled with
dirt.
3.Improper heat treatment of
dies to make it so fragile or so
soft so as to be not able to
grip.
4.Too loose for large brake
band to make the upper tongs
jaws not able to follow the
cam.
5.Dirty brake disc and brake
band fails to stop the tongs.
6.Tongs not leveled.
7.Tongs not moving exactly to
wellhead.
8.Air cylinder or air line
leaking to cause air pressure
dropping below 0. 5 MPa.
9.Dirty tongs and much filth in
law rack to cause roller
difficult to roll, but slip.
10.When
jaws
replaced
relevant plug screw not
replaced.
11.Drill pipe joint worn badly
to make jaw fail to grip.
12. The direction of locating
handle of the upper tongs is
not in correspondence with
the low tongs.
1.Replace dies.
2.Clean dirt with wire brush.
3.Replace dies.
4.Fasten the adjusting tube of
the brake band or replace spring
of the tube.
5.Olean brake disc and brake
band.
6.Level the tongs.
7.Move tongs to well head
exactly and grip drill pipe.
8.Turn the angle coupling tight,
check up sealing condition of
gripping air cylinder, replace
sealing ring.
9.Clean jaw rack, law and roller,
smear grease on their surface.
10.Replace relevant plug screw.
11.Replace under size jaw.
12.According to making up and
breaking out, put the locating
handle correspond with the
nameplate indication.
