Table 17 — Open-Drive Compressor Fits and Clearances
ITEM DESCRIPTION
CLEARANCE
TYPE OF
MEASURE
17FA4 17FA5
Min Max Min Max
in. mm in. mm in. mm in. mm
1 1st stage impeller to diaphragm
See tabulation
Axial
2 2nd stage impeller to discharge wall Axial
3 1st stage labyrinth .016 .4060 .020 .5080 .016 .4060 .020 .5080 Diametral
4 Interstage labyrinth .012 .3050 .016 .4060 .012 .3050 .016 .4060 Diametral
5 2nd stage labyrinth .008 .2030 .012 .3050 .008 .2030 .012 .3050 Diametral
6 Balancing piston labyrinth .008 .2030 .012 .3050 .008 .2030 .012 .3050 Diametral
7 Impeller shaft journal bearing .0020 .0510 .0035 .0889 .0030 .0762 .0045 .1143 Diametral
8 Thrust-end float .010 .2540 .015 .381 .010 .2540 .015 .381 Axial
9 Counterthrust bearing seal ring .002 .0510 .004 .1020 .002 .0510 .004 .1020 Diametral
10 Gear bearing to gear .0040 .1016 .0055 .1397 .0050 .1270 .0065 .1651 Diametral
10a Gear bearing to gear .010 .2540 .0185 .4699 .010 .2540 .0185 .4699 Axial
11 Gear bearing to bearing housing .0005 .0127 .0025 .0635 .0005 .0127 .0025 .0635 Diametral
12 Pinion bearing to pinion .0020 .0510 .0035 .0889 .0040 .1016 .0055 .1397 Diametral
13 Pinion bearing to bearing housing .001 .0254 .003 .0762 .0005 .0127 .0025 .0635 Diametral
14 Transmission labyrinth .006 .1520 .010 .2540 .006 .1520 .010 .2540 Diametral
15 Shaft end labyrinth .001 .0254 .005 .1270 .001 .0254 .005 .1270 Diametral
16 Drive-end journal bearing .003 .0762 .005 .1270 .0035 .0889 .0055 .1397 Diametral
17 Windage baffle to shaft .083 2.108 .104 2.642 .079 2.007 .100 2.540 Diametral
18 Inner carbon ring travel .06 MIN Each Direction .06 MIN Each Direction Axial
See Fig. 55 for item callouts.
Tabulation — Impeller Clearances (Open-Drive Compressors)
COMPRESSOR
SIZE
SHROUD
DIAM
CODE
IMPELLER DIAMETER
DIMENSION*
Item 1 Item 2
in. mm in. mm in. mm
17FA5
3
1 12.00 304.8 .837 21.26 .638 16.21
3 12.38 314.5 .797 20.24 .609 15.47
5 12.75 323.8 .757 19.23 .579 14.71
7 13.25 336.6 .717 18.21 .541 13.74
9 13.75 349.2 .690 17.53 .541 13.74
4
1 12.00 304.8 .977 24.82 .760 19.30
3 12.38 314.5 .937 23.80 .726 18.44
5 12.75 323.8 .897 22.78 .688 17.48
7 13.25 336.6 .837 23.62 .639 16.23
9 13.75 349.2 .810 20.57 .632 16.05
5
1 12.00 304.8 1.177 29.90 .895 25.02
3 12.38 314.5 1.137 28.88 .852 21.64
5 12.75 323.8 1.077 27.36 .809 20.55
7 13.25 336.6 1.017 25.83 .750 19.05
9 13.75 349.2 .970 24.64 .731 18.57
6
1 12.00 304.8 1.297 32.94 .972 24.69
3 12.38 314.5 1.237 31.42 .928 23.57
5 12.75 323.8 1.177 29.90 .880 22.35
7 13.25 336.6 1.097 27.86 .817 20.75
9 13.75 349.2 1.050 26.67 .796 20.22
8 1-9
13.75† 349.2†
4.425 112.39 .876 22.25
13.50** 342.9**
9 1-9
13.75† 349.2†
4.425 112.39 1.055 26.80
13.50** 342.9**
*Measured with shaft in thrust position (towards suction end); tolerance = ± .005 in. (± .127 mm).
†First-stage diameter.
**Second-stage diameter.
103
To Next Page
Loading...
