Page 234 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

216 Major Process Equipment Maintenance and Repair

clearance between the rod and the bore of packing case should be
checked with the compressor piston at both ends and in the center
of its stroke.
12. After installing the packing case, connect the oil, vent and coolant
lines where applicable.
Cylinder Honing. After an accident a cast iron cylinder can often be salvaged
by honing it. Table 5-1 reflects the operations involved. This procedure can
be practiced in the shop as well as in the field. It is applicable to both com-
pression and power cylinders.

Reciprocating Unlt Preventive and Predictive Maintenance

In Volume 2 of this series and in the preceding pages we described how
reciprocating machinery of the type shown in Figures 5-1 and 5-2 as well
as large diesel engines and other large internal combustion engines lend
themselves uniquely to preventive and predictive maintenance activities.
We would like to conclude this section by listing some of the important
steps in preventive and predictive measures around reciprocating units.
Here, in summary of most of the foregoing, is what should be regularly
done for maximum unit availability. For safety’s sake, remember: “Don’t
touch, just look.”

Lower Portion

Foundation

Correct a loose grout problem as soon as possible. Use an oil-resis-
tant grout, normally a resin epoxy. Refer to Volume 3 of this series
for details.
Make sure torque on foundation bolts is adequate.
Look for any movement between engine base and grout. If any is
found, consider fixing with rails and shims.
Check compressor cylinder supports and bottle wedges. Confirm
that all support and bottle wedges are tight and have not been broken.
If any are found to be loose or broken, confirm that distance piece
studs have not broken.

Base, Frame and Crankshaft

Take main-bearing bridge readings and cr&h.-deflection read-
ings periodically to detect misalignment problems early. Record web
deflections .