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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 lab-
yrinth
.008 .2030 .012 .3050 .008 .2030 .012 .3050 Diametral
7
Impeller shaft jour-
nal 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 bear-
ing 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 pin-
ion
.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 laby-
rinth
.006 .1520 .010 .2540 .006 .1520 .010 .2540 Diametral
15
Shaft end labyrinth .001 .0254 .005 .1270 .001 .0254 .005 .1270 Diametral