String Book - Logan Oil Tools

eLevator anD tooL joint inSpection gaUge
Determining if an elevator is safe or unsafe, satisfactory for use or ready for repair, should not be entrusted to the eye!
Such determinations require accurate measurements of the critical elevator parts.
Link Arm
Dimension
to MEASuRE AngLE oF 8° tApER ELEVAtoRS: Place body of gauge
on top of elevator bore, and drop sliding arm into the bore. Bring tapered
edge of slide (marked “Elevator Taper”) against tapered surface of the bore.
Read true taper angle of elevator bore at “H.” Percentage of remaining rated
capacity is given opposite the reading. Tapers of 13° and less require factory
reconditioning, or retirement from service. NOTE: Bores do not wear evenly.
Use the smallest angle found.
to MEASuRE AngLE oF 8° tApER tooL JoIntS: Place body of gauge
on top shoulder of tool joint “box.” Sliding arm is adjusted so that the tapered
edge (marked “Tool Joint Taper”) is in contact with the tapered surface of the
tool joint. The true angle is read at “H.” Percentage of remaining rated capacity
of the elevator is given opposite the reading. Again, use the smallest angle
found. Tool joints of less than 13° should be repaired or replaced.
WARNING: Even though the elevator may be in perfect condition,
a worn tool joint taper reduces its rated capacity!
While inspecting the tool joint, lay any straight edge of the gauge along the 18°
taper to check that the angle of taper has not been violated by hardbanding.
Should hardbanding extend onto the taper, such banding should be removed;
and the elevator that was used with such a tool joint should be inspected for
damaging wear.
to MEASuRE WoRn CoLLAR SuRFACES oF SQuARE ShouLDER
ELEVAtoRS: Place body of gauge on top surface of elevator. Using nontapered
end of sliding arm, drop arm end into the worn area. Depth of wear is
read on the “1/4-inch” scale where body and sliding arm cross. Shoulders worn
more than 1/16 inch should be re-faced by machining. Any rolling of the edge
into the bore should be removed so that it will not interfere with the closing of
the elevator.
to ChECk SQuARE ShouLDER tooL JoIntS: Use end of gauge body
marked “90°.” Corner has been removed to permit this measurement. Joints
out-of-square by more than 1/16 inch should be re-machined to 90°.
LInk ARM WEAR ChARt FoR ChAMpIon ELEVAtoRS
Collar type 8° taper type
Elevator Link Arm Link Arm Elevator Link Arm Link Arm
Size Cap. (ton) Dim. (in) Size Cap. (ton) Dim. (in)
100 3 100 4
C-100
90
79
2-3/4
2-1/2
T-100
91
82
3-3/4
3-1/2
69 2-1/4 72 3-1/4
150 4 150 4-3/4
C-150
136
122
3-3/4
3-1/2
T-150
138
126
4-1/2
4-1/4
108 3-1/4 114 4
250 4-3/4 250 5
C-250
230
210
4-1/2
4-1/4
T-250
232
214
4-3/4
4-1/2
190 4 198 4-1/4
350 5 400 5-1/4
322 4-3/4 368 5
C-350 300 4-1/2 T-400 338 4-3/4
276 4-1/4 311 4-1/2
250 4 286 4-1/4
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