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
11st stage impeller to
diaphragm See Tabulation
Axial
22nd stage impeller
to discharge wall Axial
31st stage labyrinth .016 .4060 .020 .5080 .016 .4060 .0 20 .5080 D iametral
4Interstage labyrint h .012 .3050 .016 .4060 .012 . 3050 .016 .4060 Di ametral
52nd stage labyrinth .008 .2030 .012 .3050 .008 .2030 .012 .3050 Diametral
6Balancing piston lab-
yrinth .008 .2030 .012 .3050 .008 .20 30 .012 .3050 Diame tral
7Impeller shaft jour-
nal bearing .0020 .0510 .0035 .0889 .0030 .0762 .0045 .1143 Diametral
8Thrust-end float .010 .2540 .015 .381 .010 .2540 .015 .381 A xial
9Counterthrust bear -
ing seal ring .002 .0510 .004 .1020 .002 .05 10 .004 .1020 Diametral
10 Gear bearing to gear .0 040 .1016 .0055 .1397 .0050 .1270 .0065 .1651 Diametral
10a Gear bearing to gear .0 10 .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 .0 01 .0254 .005 .1270 .001 .0254 .005 .1270 Diametral