T
echnical
M
anual
hD8625 8-
5
/
8
” 35K T
ong
2.11
2.
Jaw & Die Removal
If necessary the entire jaw may be removed. Support the jaw from the bottom and remove the jaw pivot bolt. The jaw may then be
slid out of and away from the cage plate. Reverse this procedure to replace the jaw assemblies (see Illustration 2.E.1)
Once the jaw has been removed, extract the die keeper screws and remove the dies by tapping dies lightly with a hammer. Replace
the dies, tapping them into place if necessary, and replace the keeper screws.
F.
TONG RIG-UP & LEVELING
1. Suspension & Restraint
Suspend the tong 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 to
and from the connection point.
The suspension line may be extended over a pulley and balanced by a counterweight equal to the weight of the tong, 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
I
llustratIon
2.e.1: j
aw
r
emoval
s
eTup
& o
peraTion
Содержание HD8625
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Страница 84: ...5 2 HD8625 8 5 8 35K Tong Technical Manual Gear Train Layout H B C D H J A K E F G ...
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