SWDM40 OPERATION & MAINTENANCE MANUAL
7.1.2 Correct Model Selection for Kelly
Below figure is the relation of Kelly and depth and weight of main frame, please choose
carefully.
Select main frame model according to the working conditions.
Select section quantity according to construction depth. The less Kelly sections, the more
strength, the lighter weight, thus, save fuel.
7.1.3 Correct Operation of Kelly
7.1.3.1 Correct Operation
Before working, follwing procedures should be done,
check, install, lift, cross, assemble, adjust, align, lower, find and retract.
Check: check construction ground for main frame, if the ground is soft, cushion thick steel
plate on the ground.
Install: install servo-frame and elevator.
Aim the slewing bearing of servo-frame at the flange on the top end of Kelly and insert
into bolts with the tightening torque standard refer to “Rotary Drilling Rig Operation &
Maintenance Manuual”, tighten the mounting bolts of slewing bearing once every 50 hours or
every week.
Pay attention to not leave bolt spacer in the Kelly when assembly and disassembly, failure
to comply may result in Kelly stuck or follow.
Before work every day, visually check mounting bolts on the slewing bearing of servo-frame
for looseness or loss, if found, repair that first.
Lift
：
lift the kelly, pay attention to the inclination direction , which should be adjusted to
vertical with the ground to avoid the deformation of Kelly caused by the leader while lifting.
Meanwhile, ensure that servo-frame aims at the mast sliding track.
Cross
：
Aim the Kelly with Rotary drive, buckle the servo-frame to the sliding track of upper
mast, and rotate Kelly to the same direction of Rotary drive inner spline and cross through
Kelly.
Assemble
：
Assemble with the kelly, plug the pin shaft and lock.
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