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The second report is from Thielsch Engineering. We have shown a metallurigical conclusion and pictures of the failed bearing.
Excerpts from Longview Inspection Report:
Nondestructive Examination of #2 Hog Fuel Boiler
East Side ID fan shaft and babbitt bearings
July 17, 1999
Prepared by: Alex Gallant
Reviewed by: James Padgett
CALIBRATION:
Soundness: An IIW block was used to calibrate the length of the shaft to be examined.
Shearwave: The IIW block was used to calibrate the system. The 1/ 16" hole was used to
establish sensitivity.
Babbitt Bond: The bearing was used to calibrate the system. An area of the bearing was
scanned to establish the bond and no bond areas, then the bearings were scanned.
EXAMINATION AREA AND RESULTS: The soundness examinations were performed from the end of the shaft and axially and radially around the shaft. No relevant indications were found. The shearwave examination was performed axially and radially around the shaft. No relevant indications were found. The Babbitt Bond examinations were performed on the bearing that was in place and on two bearings that were shipped in for replacement, The in place bearing had no significant unbond areas, however the visual examination revealed holes and cracks in the babbitt. The two spare bearings did not have any unbond areas. The Magnetic Particle examination was performed on the shaft in two opposite directions to ensure 100% coverage, No relevant indications were noted. See attached report for particulars.
SCOPE OF SERVICES
The agreement of Longview Inspection, Inc. to perform services extends only to those services provided for in writing. Under no circumstances shall such services extend beyond the performance of the requested inspection of specific equipment provided for in writing and the preparation of reports or similar documents reflecting the inspection data obtained or the opinion formulated on the basis of such inspection. It is expressly understood that all descriptions, comments, and expressions of opinion reflect the opinion and observations of the examiner and are not intended nor can they be construed as representations or warranties as to the actual circumstances, Longview Inspection is not assuming any responsibilities of the owner/operator and the owner/operator retains complete responsibility for the engineering, repair and use decisions as a result of the inspection data or other inforination provided by Longview Inspection. In no event shall Longview Inspection's liability in respect of the services referred to herein exceed the amount paid for such services.
STANDARD OF CARE.
In performing the services provided, Longview Inspection, Inc. uses the degree, care and skill ordinarily exercised under similar circumstances by others performing such services in the same or similar locality. No other warranty, expressed or implied, is made or intended by Longview Inspection, Inc.
Excerpted from Theilsch Eng. Metallurgy report.
DISCUSSION AND CONCLUSIONS
The metallurgical evaluation of the bearing did not reveal any evidence of any pre-existing manufacturing defects such as disbonding or microstructural anomalies which could have caused or contributed to the failure of the bearing. The microstructure of the bearing consisted of white primary cuboids of an antimony-tin intermetallic in a matrix consisting Of a solid solution of a lead-rich phase (dark) and an antimony-tin phase (light), typical for this babbitt material. The comparison between the microstructure observed in the affected and unaffected areas did not reveal significant variations which could have caused or contributed to the failure of the bearing.
ThieIsch Engineering Inc
Photos from the Thielsch Report
