80-0420-23 POWER TONG
Manual № TM12012
Section 3
Page 3.9
©2008-2017 McCoy Global
Installation & Commissioning
3.2.3 Lift Cylinder Safety (continued):
!
WARNING
IMMEDIATELY CEASE LIFT CYLINDER OPERATION IN THE EVENT OF ENTANGLEMENT OF THE
HYDRAULIC LINE WITH FIXED RIG COMPONENTS OR TONG SUPERSTRUCTURE.
The protective wrap also prevents wear of the hydraulic line though abrasion. Do not remove the protective wrap
from the lift cylinder line, and replace protective wrap if it is missing, torn, or split. Regardless of use or condition,
the hydraulic line supplying the lift cylinder must be replaced every two years.
!
WARNING
REPLACE LIFT CYLINDER HYDRAULIC LINE EVERY TWO YEARS
The control valve section on the power tong is equipped with an internal check valve, preventing sudden drop of
the tong in the event of hydraulic power failure. A speed-limiting orifice is installed directly in the hydraulic inlet port
of the lift cylinder. The orifice limits flow of hydraulic fluid from the lift cylinder through the control valve, preventing
sudden drop of the lift cylinder in the event of a ruptured hydraulic line. Do not remove the speed-limiting orifice,
and only replace with an identical orifice supplied by McCoy.
!
WARNING
DO NOT REMOVE THE SPEED-LIMITING ORIFICE FROM THE LIFT CYLINDER HYDRAULIC INLET PORT
The working load limit (WLL) is clearly stenciled on to the side of the lift cylinder. Do not use lift cylinder if the WLL
stencil has been rubbed off or intentionally removed. Locate the test certificate that accompanied the cylinder to
the job site or, if necessary, obtain a copy of the test certificate from the location at which the original certificate
has been stored. The lift cylinder must be clearly re-marked with the WLL before it is released to an operating
environment.
!
WARNING
DO NOT USE A LIFT CYLINDER WITH A MISSING OR DEFACED WLL STENCIL.
McCoy Global cautions its customers to use proper placement of equipment positioning systems when moving
tubular connection equipment on and off well center.
Application of lateral force against any component of the lift cylinder, or any other rigid component of the hanging
system, may impart an over-turning moment to the lift cylinder rod end at the connection point to the clevis. This
over-turning moment has the potential to introduce stress fractures.
McCoy Global recommends inspection of the lift cylinders at the beginning of each shift prior to hoisting to ensure
that the integrity of the rod ends has not been compromised. Lift cylinders found to have fractures or deformations
must immediately be quarantined until repaired and recertified (see illustration 3.2.3).
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