MCCOY KT5500 - General Operational Comments

80-0420-23 POWER TONG
Manual № TM12012
Section 4
Page 4.5
©2008-2017 McCoy Global
Operation
2. When making-up integral (shouldered) joints, it is essential to make up the last turn of the threads in low gear.
This reduces the tendency of an instant stop or a sudden increase in torque, which induces extremely high
stresses on the gear train.
3. DO NOT employ the “snap break” method of breaking-out joints when pulling a string. The extremely high
stress placed on the gear train frequently causes gear breakage.
4. Consider the following when operating your equipment in temperatures below 0°C (32°F)
• Select gear and bearing lubricants that are compatible with expected climatic conditions
• Select hydraulic fluid that is compatible with expected climatic conditions
• Allow sufficient time for hydraulic fluid to warm to operating temperature following a power unit cold start prior
to activating the bypass valve to allow fluid to circulate to tong
• Allow for adequate drying of moisture (prior to lubricating) when cleaning tong parts in cold weather
!
WARNING
DO NOT APPLY BREAK-OUT TORQUE IF THE ROTARY GEAR IS NOT IN FULL CONTACT WITH BOTH
IDLER GEAR ASSEMBLIES.
!
WARNING
THE “SNAP-BREAK” METHOD OF BREAKING CONNECTIONS IS HAZARDOUS TO RIG PERSONNEL
AND EQUIPMENT.
4.0.7 General Operational Comments
1. Full break-out torque is only achievable when the rotary gear is in full contact with both idler gears. Position
rotary gear in contact with both idler gears when preparing to break connections or collars where high torques
are required. Do not apply break-out torque if, for any reason (slippage, for example), the rotary gear rotates
past 90 degrees without gripping the tubular. Applying full torque to break out a joint when the rotary gear is
not in full contact with both idler gear assemblies presents a significant hazard of catastrophic tong failure.