GE H301 Series, Operating Manual

Page: 53 / 137

H301/302 HSR Compressors | Rev. 2.2 | 43
Angular (A) Face Misalignment Parallel Offset Radial (R) Misalignment
FiguRe 8 Sketch description of misalignment
Dial indicator positions for checking the radial ( R ) and angular ( A ) alignment are
suggested in "Figure 9" .
FiguRe 9 Dial indicator arrangement
Thermal Growth
The compressor’s cast iron frame thermally grows between ambient (cold) to
normal (hot) operating conditions. The expected vertical change, from the bottom
of the frame foot to the compressor’s crankshaft center line position, is shown
in
“Table 13” . These thermal growth figures may need to be prorated, if the
anticipated difference between cold and hot operating conditions is more or less
than 100°F. (38°C).