Farr HD8625, Technical Manual

Page: 35 / 156

T
echnical
M
anual
hD8625 8-
5
/
8
” 35K T
ong
2.19
s
eTup
& o
peraTion
Making A Connection (Continued)
I
llustratIon
2.H.2: B
aCkIng
P
In
s
et
t
o
“m
ake
-
uP
” P
osItIon
c) Ensure the load cell and snub line(s) are properly configured for making up connections. A “snub line” is a length of wire rope
that connects the rear of the tong body to a sturdy anchor on the drill floor (see Section 2.F.1). The snub line prevents the tong
body from spinning in the opposite direction of the cage plate when torque begins to build in the joint. Farr Canada Corp. rec-
ommends using two snub lines when running the equipment to eliminate uncontrolled movement in either rotational direction.
The snub line(s) must be rated for the applied torque plus whatever safety margins stated by your own operating policies. The
snub line connection point on the drill floor must be sturdy enough to absorb all applied forces when making up the joints. When
making up joints the load cell must be connected to the driller’s side of the tong, which is the left side of the tong as seen from
the rear. For accurate torque measurement the snub line between the tong body and the anchor must be perpendicular to the
vertical, and perpendicular to the centre-line of the tong.
d) Actuate the lift cylinder control valve to lift the assembly from the drill floor. Pulling the valve toward the operator will retract the
lift cylinder to raise the assembly (see Illustration 2.H.3 below). Note that rig personnel are required to stabilize the tong and
backup as it is being lifted so it does not swing and collide with other rig equipment.
RIG PERSONNEL MUST STABILIZE THE TONG AS IT IS LIFTED FROM THE DRILL FLOOR
I
llustratIon
2.H.3: l
Ift
C
ylInDer
C
ontrol
- r
aIse