KT5500 5-
1
/
2
” T
ong
& CLInCHER® B
aCKup
S
ECTIon
C
onTEnTS
2.16
T
ECHnICaL
M
anuaL
S
ETup
& o
pERaTIon
To remove the die from the rear jaw, ensure both cylinders are retracted. Remove the hex bolt securing the rear jaw assembly,
then slide rear jaw forward enough so that the flat-head cap screws securing the die retainer tab is well exposed. Remove the
die following the same procedures as for the
CLINCHER®
cylinders.
Reverse this procedure to install or replace jaws.
F.
TONG RIG-UP & LEVELING
1. Suspension & Restraint
Suspend the tong and backup from a location as near to the centre of the drill rotary as possible, and from a location high
enough on the mast to ensure easy handling. The lower the point from which the tong is suspended, the more effort will be
required to move the tong and backup assembly on to and off the connection.
The suspension line may be extended over a pulley and balanced by a counterweight equal to the weight of the tong and
backup, or simply tied off in the derrick to form a dead line. When using a dead line arrangement it is necessary to use a FARR
spring hanger assembly (see specification page for recommended spring hanger). This spring hanger compensates for the
downward movement of the casing as the thread is made-up, and imparts additional force to the suspension cable:
● a “single spring” hanger typically applies 420 lbs. (191 kg.) to the suspension line for every inch of thread made up
● a “double spring” hanger typically applies 840 lbs. (382 kg.) to the suspension line for every inch of thread made up
If you do not know which specific spring hanger is in use, check the specification page in this manual for information on the
recommended spring hanger for this application. McCoy Drilling & Completions will not guarantee or specify spring hangers
other than what has been supplied by McCoy.
Many applications use a lift cylinder for adjusting the height of the tong. Ensure the weight of the lift cylinder is known if it has
not been included in the total weight of the tong.
All forces upon the suspension line must be considered when calculating necessary strength of the suspension line. The weight
of the tong, the weight of the lift cylinder, the weight of the spring hanger, and the force imparted on the suspension line by
the spring hanger must all be added together in order to arrive at the total force supported by the suspension line. Select your
suspension line based upon the total force and the margins of safety dictated by the policies of your company and by estab-
lished engineering practices. Ultimately, calculating the force on the suspension line and selection of the suspension line is the
complete responsibility of the customer.
Summary of Contents for 80-0420-16
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