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Table 26 — Compressor Fits and Clearances
ITEM DESCRIPTION
CLEARANCE
TYPE OF
MEASURE
Minimum Maximum
in. mm in. mm
1 1st Stage Impeller to Diaphragm See Tabulation Axial
2 Interstage Labyrinth 0.012 0.305 0.016 0.406 Diametral
3 2nd Stage Impeller to Discharge Wall See Tabulation Axial
4 Thrust End Journal Bearing 0.0035 0.0889 0.0055 0.1397 Diametral
5 Thrust End Float 0.010 0.254 0.015 0.381 Axial
6 Inner Carbon Ring Travel .06 in. (1.52 mm) minimum in each direction Axial
7 Shaft End Labyrinth 0.001 0.025 0.005 0.127 Diametral
8 Windage Baffle to Shaft 0.092 2.337 0.095 2.413 Diametral
9
Shaft Displacement (Shrouds3-6)
Detector (Shrouds8&9)
0.008 0.203 0.010 0.254
Axial
0.023 0.584 0.025 0.635
10 Counterthrust Bearing Seal Ring 0.006 0.152 0.010 0.254 Diametral
11 Balancing Piston, Labyrinth
0.008 0.203 0.012 0.305
Diametral
0.018 0.457 0.022 0.559
12 2nd Stage Labyrinth 0.008 0.203 0.012 0.305 Diametral
13
1st Stage
Labyrinth
(Shrouds3-6) 0.016 0.406 0.020 0.508
Diametral
(Shrouds8&9) 0.018 0.457 0.022 0.559
14 Seal End Journal Bearing 0.0035 0.0889 0.0055 0.1397 Diametral
106