Page 203 - Reciprocating Compressors Operation Maintenance

Operation and Maintenance of Reciprocating Compressors 189

will then become virtually tight and remain so until normal wear or some
foreign influence disturbs its condition.
MAINTENANCE OF PISTON ROD PACKING

Figure 3-49 shows an exploded view of typical cup-type packing with
the various parts in proper order and each part named to highlight both
functions and terms used.

p BT 80 LUK
PRESSURE SINGLE ACTING SEAl RINGS OOUBtE ACTING jr
BREAKER S" 1 RING

GASKEl END CUP

FIGURE 3-49. Exploded view of typical cup-type packing (Source: C, Lee.
Cook, Louisville, Kentucky).

Figure 3-50 shows various styles of rings in common use and illus-
trates proper assembly and position with respect to the pressure side.
It is strongly recommended that new packing rings and springs be
installed when required, and reconditioned packing cases be used.

Either side may face pressure Proper »lde must face pressure Proper side must face pressure

Figure A Double Acting Packing fling FigweB Single Acting Packing Ring FigureC Single Acting Packing Ring
Proper side must face pressure Either side may face pressure Proper side must face pressure

Figure O Single ActtiB Packing fling FiQwe E Double Acting Cneck FUng Figure F Single AcSng Che* Hag
Either side may face pressure Either slda may face pressure Proper side must face oil

Figure O Double Acting Pressure theakw Figure H Double Acting Pressure Breaker Figure I Single Acting Wiper
FIGURE 3-5O, Different styles of packing and required assembly position
(Source: Dresser-Rand, Painted Post, New York).