GE H301 Series, Operating Manual

Page: 54 / 137

44 | Chapter 4: Installation
Frame model series
Center line height (nominal)
Inches (mm)
Thermal growth
Inches (mm)
H302 12.3125 (312.7375) 0.007 (0.178)
Table 13 Compressor frame thermal growth
For example: 12.315 x 0.0000058=0.00007 0.00007 x 100°F=0.007"
The tabled compressor frame thermal growth figures are
based upon a 100°F (38°C) temperature rise and use a cast
iron thermal expansion coefficient of 0.0000058 inch/ inch/
°F.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (9)
maximum allowable Drive Train misalignment
An HSR compressor drive train must be properly aligned for its normal (hot)
operating condition.
The maximum allowable hot total indicator run out (TIR) is
0.005" (0.127 mm) for both angular (face) and parallel (radial)
misalignment when using a 12" (305 mm) diameter coupling.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (9)
Since the compressor and its driver seldom have the same shaft center line height
and operating temperature, the drive train is often misaligned for its ambient
(cold) condition. Check the drive train’s alignment and adjust as required, during
compressor installation and after startup for its normal (hot) operating condition.
Typically the compressor (with its attached piping limiting it
movement) is considered the fixed piece in the drive train,
with the driver being the movable component for realignment
purposes. The Packager’s design and installation practices
will determine the initial cold offset between the driver and
the compressor.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (9)
Driver to Compressor Free Coupling alignment
Use the “free coupling” method to minimize alignment inaccuracies, since one
end of the coupling is unrestrained. Refer to
“Figure 9” for the dial indicator
arrangement and which coupling hub bolts to remove.
Indicator R measures the radial misalignment or parallel offset. Indicator A
measures the axial or angular misalignment.