Westco 16-25, Product Manual, Page: 9 / 49

Power Tong
The part numbers and performance specifications for the Model 16 tong are
listed in Figure 1-6. Figure 1-7 is a typical performance curve for the tong.
Figure 1-7: Typical performance curve
Spring Hanger
Lift Cylinder and Controls
Torque Gauge Assembly
16 Inch Rotary Gear
Accessories and Options
The optional spring hanger (part no. 100181-001) (Figure 2-3) permits the tong to
move up or down to allow for thread length change in make-up and breakout
operations. When used, the spring hanger should be attached directly to and used
as a hanger for the tong.
The hydraulic lift cylinder assembly (part no. 103652-001) provides a means for
raising and lowering the tong during operations. When a cylinder is ordered with a tong,
the tong contains an additional control lever for controlling the lift cylinder up or down.
This lever is identical to the tong operating control lever. Pulling the lever outward
provides pressure from the hydraulic power unit to operate the lift cylinder upward
and thus to raise the tong, whereas pushing the control lever forward operates the cylinder
downward to lower the tong. The central lever position is the neutral position.
The optional torque gauge assembly part no. 111918-001 for 0 to 30,000 lbs. ft
(40,675 Nm); 111918-002 for 0 to 20,000 lbs. ft (27.116Nm) measures the torque
exerted while the tong is used in make-up or breakout operations. Consisting of a
hydraulic cylinder and torque meter connected by a pressure hose, the torque gauge
assembly senses and indicates the torque developed during an operation. For
operation, the hydraulic cylinder is connected by a shackle to the rear of the tong. A
backup line is connected to the cylinder and is tied off to a solid part of a rig structure
to form an angle of 90 degrees to yield accurate torque readings. See Figure 2-2
The 16 inch rotary gear (part no. 112373-001) is required for working casing
larger than 13-3/8 inches in outside diameter.