Radial Clearances N And R - ABB A140-H56 Operation Manual

Operation Manual / A130-H.. - A140-H..
10 Disassembly and assembly
10.8

Radial clearances N and R

Figure 43
N and R
These are theoretical values for the radial clearance between the compressor wheel and the
wall insert or between the turbine wheel and the gas outlet flange.
The minimum and maximum values result from the manufacturing tolerances of the compres-
sor wheel and turbine wheel or the wall insert and the gas outlet flange.
N1, R1, N2, R2
The clearances in the bearings and casing centrings are not distributed evenly because of the
rotor weight.
Feeler gauge
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N1 and N2 or R1 and R2, respectively, are always
measured simultaneously using two feeler gauges.
To measure N1 and N2, the feeler gauges must be
inserted without clearance between partition wall and
compressor wheel, one each above and below.
To measure R1 and R2, the feeler gauges must be
inserted without clearance between gas outlet flange
and turbine, one each above and below.
HZTL2414_EN
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Revision B
March 2013