Ariel JGJ Series, Technical Manual

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F
OR
M
ODELS
: JGW, JGR
AND
JGJ S
ECTION
2 - I
NSTALLATION
PAGE 2 - 2 1/01
cleaned prior to assembly at the Ariel factory. Then each unit is put through a
test run with a filtered closed lube loop.
5. Compressor cylinders that have water-cooled packing are to be connected to
water cooling unless prior approval is obtained from Ariel Field Service.
Setting
The following procedure is to be used for setting the compressor on the skid:
After finding the approximate position of the compressor frame, the mounting bolts are to be
tightened in place and then loosened. Shims are then to be adjusted so there is no move-
ment more than a variation of 0.002 inches (0.05 mm) between the bottom of the frame and
the skid supports. With the frame again bolted into place and the crosshead guide supports
free, the distance from the crosshead guide supports to their respective skid supports is to
be measured. To these measurements add the amount of deflection due to the cylinder
weight as listed on the appropriate compressor cylinder outline drawing. Raise the cylinder
and shim between the guide and guide support before tightening the crosshead guide
mounting bolts. Consult Packager’s information for mounting bolt tightening torque values.
This work must be performed prior to the addition of bottles and piping.
Alignment
Proper alignment is necessary for satisfactory performance. A flexible coupling will not make
up for poor alignment. Misalignment can result in:
•
High bending moment on the crankshaft
•
Large axial forces
•
Excessive wear to the bearings
•
And if severe, probable damage to various components
An Ariel compressor may be aligned by any of a number of acceptable methods such as:
•
Face/peripheral
•
Reverse indicator
•
Across the disc pack
•
Optical
•
Laser
•
Mechanical direct to computer
When aligning a unit some procedural concerns are:
•
Soft foot (compressor and driver are not laying flat)
•
Repeatable readings
•
Which way indicator moves (plus or minus)
•
Thermal growth
•
Indicator sag