Page 365 - Reciprocating Compressors Operation Maintenance

35O Reciprocating Compressors: Operation and Maintenance

Compressor-Piston Rod Inspection Form
Stage: 1st& 2nd Date:
Drawing: Inspected by:
F A B C G D E H
I i I _m i i

t t t
t f
•
Piston Rod Diameters
Packing A B C Drawing Size Limit
Vertical 6-1! > U-2.995"
2,999"/3.000" O-2.998"
Horizontal 3-9 T-2.998"
Piston Fit D E Drawing Size Limit
Vertical 6-12
1.9975V1.998" 1.996"
Horizontal 3-9
Note: U=Undersize; O=Out Round; T= Taper
Piston Rod Runout=T.I.R.
F A B C G I3 E H Limit
+-,001"
FIGURE 6-4. Piston rod inspection form.

4. To evaluate evidence found in order to detect causes of abnormally
short life, for example, faulty lubrication conditions resulting in
rapid bearing degradation, or excessive misalignment leading to
component wear.
5. To evaluate data to determine inspection intervals, routines, and
techniques.

Note: One of the objectives of preventive maintenance is to avoid per-
forming unnecessary maintenance and unnecessary costs. Evaluating
inspection data helps achieve this objective.

MAINTENANCE COSTS

Perhaps the most frequent problem maintenance departments face is
rising cost and diminishing resources. While being constantly confronted