Specifications
Table 14 — Compressor Fits and Clearances
ITEM* DESCRIPTION
CLEARANCE†
TYPE OF
MEASURE
in. mm
Minimum Maximum Minimum Maximum
1 1st Stage Impeller to Diaphagm
See Table 15
Axial
2 2nd Stage Impeller to Discharge Wall Axial
3 1st Stage Labyrinth .0160 .0200 .4060 .5080 Diametral
4 Interstage Labyrinth .0120 .0160 .3050 .4060 Diametral
5 2nd Stage Labyrinth .0080 .0120 .2030 .3050 Diametral
6 Balancing Piston Labyrinth .0080 .0120 .2030 .3050 Diametral
7 Impeller Shaft Journal Bearing .0030 .0045 .0762 .1143 Diametral
8 Thrust-end Float .0100 .0150 .2540 .3810 Axial
9 Counterthrust Bearing Seal Ring .0020 .0040 .0510 .1020 Diametral
10 Gear Bearing to Gear .0050 .0065 .1270 .1651 Diametral
11 Gear Bearing to Gear .0100 .0185 .2540 .4699 Axial
12 Gear Bearing to Bearing Housing .0005 .0025 .0127 .0635 Diametral
13 Pinion Bearing to Pinion .0040 .0055 .1016 .1397 Diametral
14 Pinion Bearing to Bearing Housing .0005 .0025 .1270 .0635 Diametral
15 Transmission Labyrinth .0060 .0100 .1520 .2540 Diametral
16 Motor-End Labyrinth .0050 .0080 .1270 .0635 Diametral
17 Motor-End Bearing to Shaft .0040 .0054 .1016 .1372 Diametral
18 Motor-End Bearing to Bearing Housing .0005 .0020 .0127 .0508 Diametral
*See Fig. 35 for item. callouts.
†Clearances represent factory tolerances for new components.
Table 15 — Impeller Clearances
FRAME
CODE
SHROUD
CODE
IMPELLER
CODE
IMPELLER DIAMETER
DIMENSION*
Item 1 Item 2
in. mm in. mm in. mm
4 2
1
3
5
7
9
9.10
9.40
9.70
10.00
10.40
304.8
314.5
323.8
336.6
349.2
0.631
0.596
0.561
0.531
0.511
16.03
15.14
14.25
13.49
12.98
0.498
0.473
0.448
0.423
0.418
12.65
12.01
11.38
10.74
10.62
4 3
1
3
5
7
9
9.10
9.40
9.70
10.00
10.40
304.8
314.5
323.8
336.6
349.2
0.837
0.797
0.757
0.717
0.690
21.26
20.24
19.23
18.21
17.53
0.638
0.609
0.579
0.541
0.541
16.21
15.47
14.71
13.74
13.74
4 4
1
3
5
7
9
9.10
9.40
9.70
10.00
10.40
304.8
314.5
323.8
336.6
349.2
0.977
0.937
0.897
0.837
0.810
24.82
23.80
22.78
23.62
20.57
0.760
0.726
0.688
0.639
0.632
19.30
18.44
17.48
16.23
16.05
4 5
1
3
5
7
9
9.10
9.40
9.70
10.00
10.40
304.8
314.5
323.8
336.6
349.2
1.177
1.137
1.077
1.017
0.970
29.90
28.88
27.36
25.83
24.64
0.895
0.852
0.809
0.750
0.731
25.02
21.64
20.55
19.05
18.57
4 6
1
3
5
7
9
9.10
9.40
9.70
10.00
10.40
304.8
314.5
323.8
336.6
349.2
1.297
1.237
1.177
1.007
1.050
32.94
31.42
29.90
27.86
26.67
0.972
0.928
0.880
0.817
0.796
24.69
23.57
22.35
20.75
20.22
MODEL NUMBER NOMENCLATURE FOR COMPRESSOR SIZE
(SEE FIG. 1 ALSO)
68