1 Wyoming Public Utility Shaft Breakage Torque Study Problem: Shaft Breakage – (2) 1500 HP Reliance Electric Motors Application: Driving Reciprocating Compressor for Atomizer Project Actions Completed Motor Design review with RSN Motor Engineering 5/1 Completed Detailed Process Review with Grand Eagle 5/8 – (Fact Finding) Completed Initial Process Assessment 5/21 – (Research) Installed Telemetric Strain Gage on Rebuilt Motor – (Measurement) Compiled Motor Torque Curves – (Analysis of Findings) Concluded Compressor was Introducing Torsion Resonance – 6/3 Compressor Manufacturer Agreed to Install Fly Wheel – 6/12 Customer is Presently Running Compressors at 1170 RPM’s just below 1180 RPM threshold for resonance (1192 Full RPM).

2 Public Utility Shaft Breakage Analysis Shaft Breakage Extends at 45 Degrees Indicative of a twisting moment as opposed to shear Sleeve Bearing Wear Pattern Indicative of a extreme radial forces

3 Torque Analysis Using Telemetric Strain Gage Conclusions: - Torsional Resonance Corrective Actions: -Operate below critical speed until flywheel is installed Result: - Resolved Customer Application Issue - Mitigated Warranty Exposure Grand Eagle / Baldor - Torsional resonance issues resolved after installation of flywheel to critically damp system Chart #1: Shaft displacement at full load and 1192 RPM run speed. Four Modes of displacement are present. (Full Spectrum) Chart #2: Shaft displacement filtered to 4 times to demonstrate displacement frequency was directly proportional to four stage compressor action. Chart #3: Shaft displacement filtered to 1 times to demonstrate shaft displacement frequency was directly proportional to any one stage in four stage compressor. Chart #1: Chart #2: Chart #3:

4 Coast-to-Coast Coverage