Safety, Operation and Maintenance Manual-September 30, 2019
8-5
8.2 Common Misoperation
Category Failure analysis
Common
misoperation
causing rollover
During travelling, the rig does not extend its crawlers.
The rig travels on unstable or inclined ground, such as backfill, sloping fields,
gully and slide etc.
During travelling, the rig does not incline backward or the inclination angle is
to little.
Sudden acceleration and deceleration; sudden rotation of upper carriage and
the whole machine.
During travelling up and down the slope, the rig is operated so brutal that its
gravity center suddenly changes and the rig becomes unstable.
The rig changes its direction, moves transversely or stops on the slope. The
rig swings during travelling up and down the slope.
If the mast inclines backward too much when travelling up the slope, the Kelly
bar will slip down and the rig will incline backward due to loss of gravity center.
If crawler does not extend when erecting the mast, rollover will happen when
swinging the machine.
Other common
misoperation
The borehole is not vertical because the rig starts drilling borehole without
adjusting mast verticality. If you adjust it halfway, the drilling head will probably
get stuck.
The mast cannot be raised because the mast extends too little when lowering
the mast. The weight of Kelly bar is easily to deform the mast or even break
the mast.
When lifting the Kelly bar, limit switch is not noticed. Wire rope clip damages
large pulley too much.
If travel is unlocked when drilling, the Kelly bar will deform and crack due to
misoperation of travelling handle.
The drilling head levels the ground and it causes square head cracking.
When connecting upper mast and masthead, the harness in mast is broken.
When removing connection rod, the rod bends if adjust verticality directly by
auto mast erecting due to uneven ground.
The boom is lowered without completely lowering the mast. If the mast is
adjusted then, the cab will be crashed.
Use square head to drag drilling head (The weldment of square head easily
cracks).
If the boom is not raised enough when the rig is driving down the trailer, rotary
drive flange will touche the ground, which may deform the flange, when the rig
is driving down the ladder.
SR400R Rotary Drilling Rig
Appendix
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