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Logan 85-Ton Open Loop Power Swivel
Logan 85-Ton Open Loop Power Swivel
2. A Logan Safety Cable (provided as
standard equipment on the Logan 85-
Ton Open Loop Power Swivel) should
be used for torque rein and should
be utilized at all times. Attach one
end of the safety cable to the torque
rein and secure the other end to the
swivel. In the event of torque rein
assembly failure, the safety cable will
prevent the assembly from falling to
the rig floor.
3. Carefully check the full range of
travel in the derrick or mast before
beginning operations. With the guide
cable as nearly vertical as possible,
ensure that the swivel can move
freely up and down under full torque
in either direction. Angles exceeding
5% can cause side loads on the
swivel.
4. Although Logan bails are not as
dangerous as “stepped” bails, tubing
elevators should not be used with
Power Swivel bails. Besides being
a potentially dangerous practice, the
use of an upset elevator reduces
the contact between the elevator and
bail, and accelerates wear.
5. Inspect elevators and bails for exces-
sive wear according to guidelines
published in API RP-8B.
WARNING:
Failure to comply with
these safety procedures may cause
physical injury to the operator and/or
rig floor personnel
CONSTRUCTION
Power Swivel Assembly
The Logan 85-Ton Open Loop Power
Swivel is powered by a fixed displace
-
ment, piston-type, hydraulic motor rated
at 5,000 psi. The motor is mounted
on the underside of the swivel and is
protected by a steel frame.
Two high pressure hydraulic hoses and
the motor drain hose exit from the bot-
tom of the assembly. The high pressure
hydraulic hoses connect to the motor
with swivel joints. The motor drain hose
is fitted with a self-sealing quick dis-
connect coupling.
The one-piece gooseneck is construc-
ted of cast steel. A 2-inch I.D. NPT ac-
cess plug located in the top allows pas-
sage of wireline and small tools through
the swivel for downhole operations.
The gooseneck and swivel packing are
hydrostatically tested and rated at 5,000
psi circulating pressure.
The floating washpipe assembly and
packing are self-aligning. Friction bear-
ing surfaces of the washpipe (areas that
contact the packing) are hard-surfaced
for wear-resistance.
The elevator bail is machined or flame
cut from forged, heat-treated alloy
steel for maximum strength. The bail,
bail pins, and body are tested to API
guidelines.
The design incorporates a reliable,
custom drive train with hardened steel
gears consisting of: a motor drive gear,
reduction drive gear, an intermediate
gear, and the main drive gear. Roller
bearings keep the gears in close align-
ment.
A magnetic drain plug is located on the
lower cover plate of the swivel assem-
bly. A tell-tale hole in the lower plate
indicates hydraulic oil leakage past the
motor shaft seal or lubricating gear oil
past the input pinion shaft. A filler/relief
plug is located on the upper cover plate.
The gear housing is equipped with an
oil level sight glass so the operator may
check oil level with a quick glance.
To protect the main stem oil seal from
dirt, an excluder seal is installed below
the packing nut.
Control Units
Control assemblies for the Logan
85-Ton Open Loop Power Swivel are
either air or electric. They can be oper-
ated remotely (extra cost option) for
operator convenience and safety, or
from the power unit. Remote control
assemblies are pedestal mounted. The
control assembly is lightweight and the
pedestal base is removable for easy
storage on the trailer or skid. A new
wireless remote with an operating range
of 150 feet is also available.
Air controls consist of an air compressor
and tank, an air filter/regulator/lubricator
unit, manual torque control, and a ped-
estal mounted control panel with extra
lines fitted with quick disconnect coup-
lers. A lever-operated air valve controls
the engine speed. Another single-lever
air valve controls the direction and
speed of the Power Swivel. A torque
gauge, calibrated in ft-lbs, indicates
torque.
Lightweight, compact swivel-head design
fits most drilling or workover masts
