Page 261 - Reciprocating Compressors Operation Maintenance

246 Reciprocating Compressors: Operation and Maintenance

• First, ensure that all the housing nuts are torqued properly.
• Second, ensure that the packing and scraper assembly are not binding
the rod. If the proper runout still cannot be attained, rotate the piston
and rod assembly 90°, Make sure the frame and outer end piston
clearances are still adequate to prevent contact with their respective
heads, Relock the crosshead jam nut; take both vertical and horizon-
tal runouts again and record them.

Always refer to the instruction book for acceptable piston rod runout
readings and the methods of correcting or determining unacceptable
readings.
Table 4-1 gives shimming guidelines for crosshead shoes.

TABLE 4-1

TOTAL THICKNESS OF SHIMS BETWEEN
CROSSHEADS 1 SHOES IN INCHES
pi STQH CHOSfHEAD Cft9$4lMEA8
MATERIAL Individual 8 I* Thick*.*!* " .008' SHO£ 01 AM. IK.
.020' r:::::;;:::::[ .028* .028* .030* ,030* »**** .098* ',0*0* TOP
.020*
1
C.I.
.0*8* ,0*8* .0*0* .0*0* .038" .038* .030* .030* .028* OOTTOM
25
.020* ,028* .028* .010* .038* .0*0* .0*8" .080* TOP
AL.
.0*8* .010* .0*0* .031" .030* .028* .020* .018* 80TTON
.018' .020* ,018* .018* .030* -.030* .039" <038* .0*0* TOP
C.I.
.038* .030* .028* .028* ,020* ,020* .018* ,018* .010* 80TTOH
!9-22i
,020* • 028* .028* tfJ** .030* .038* T*f «* •Hi* TOP
AL.
.030* .029* .028* .020* .020* .018* .010* ,008* •OTTOM
T0«0* .020* .018* .030" .030* 4 038* .038* .080* .0*0* TOP
C.I.
.020* .020* .018* .010* .010* .008* .008* .000* .000* 80TTON
» 124-l/i
.020" .028* .028* .OfO* .098* .0*0* .0*0* .0»O' TOP
AL,
.020* .018* .018* .010* .008* .000* .000* .000* 80TTOH
t020* tUir «iii" t»r .030* •0«ff* „ itn: ro»o- TOP t
C.I.
,020* .020* ,0t«" ,^10* .010* .009* .000* .000* BOTTOM
I0i
*•*[«? ,0«0* j .0*0* TOP
AL.
,020* .018* I .010* .009' .008" .000* I .080* (t°tt
0 - 8 8 - 10J 10-18 18-20 20-28 28-30 |sO-38 SI 10 *o-*s
8 10 ' 18 20 28 50 ' 38 1 1 *8
PI8TO* OIANCTEM - INCHES
SHIHMIHQ OF CROSSHEAD SHOES FOR MORE
ACCURATE PISTON ROD RUN-OUT