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