GE H301 Series, Operating Manual

Page: 52 / 137

42 | Chapter 4: Installation
Refer to compressor Hold-Down Bolting for recommended
bolt sizes and minimum torquing requirements.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (9)
alignment
Frame Deflection (Soft Foot)
1. Use a magnetic base dial indicator to check for frame deflection (soft foot)
when tightening the frame sub-base bolts, .
2. To eliminate any deflection, add or remove shims between the frame and sub-
base (as necessary).
Refer to the compressor Hold-Down Bolting for
recommended bolt sizes and minimum torquing
requirements.
Complies with ANSI Z535, ISO 3864, OSHA 1910.145 (f) (9)
Drive Train Alignment Checks
Even though flexible coupling design allows for limited misalignment, poor
alignment can affect;
1. Coupling component life
2. Main and thrust bearing wear
3. Package vibration levels and compressor axial thrust
4. Crankshaft bending and shaft seal wear
5.
Power consumption efficiency and available compression horsepower
HSR compressors can be aligned by several methods, including dial indicator
and laser. Regardless of the alignment method, when aligning a drive train the
procedural concerns are;
1. Soft foot – compressor mounting foot support not on plane
2. Inadequate hold down bolt torque
3. Thermal growth change in shafts center line
4. Indicator bar sag
5.
Weight of flywheel (if applicable)
6. Repeatable readings
Typical misalignments that occur between coupled shafts are shown in “Figure 8” .