Detecting rolling element bearing defects can be difficult if a few things are not taken into consideration. First, consider how the bearing fails. Normally one of the races will begin to fail followed by the roller/ball and then the cage. Initially these failures do not show up at the calculated bearing fault frequencies, but at [...]
Do you use accurate alarm values for your vibration analysis program or other CM technologies? Setting accurate alarm values will help you identify equipment defects occurring in your equipment. However, the benefits go beyond this. Missing alarms or inaccurate alarms may force your analyst to review every machine each time data is collected. This wastes [...]
RELIABLE PLANT • February 2012 Orbits have historically been used to measure relative shaft movement within a journal-type bearing. The shape of the orbit told the analyst how the shaft was behaving within the bearing as well as the probable cause of the movement. This was accomplished using proximity probes usually mounted through the bearings with [...]
PLANT SERVICES • January 2012 Vibration analysis and condition monitoring are part of a bigger picture. Reducing maintenance cost, reducing production cost, improving uptime, reducing risk, improving safety, and improving product quality are some of the essential drivers for deploying vibration analysis and other predictive maintenance tools. They should be goals of any plant or [...]
Fault frequencies are very important in vibration analysis, because they allow the analyst to correlate vibration data to specific components in the equipment that may be in some stage of failure (equipment faults). Fault frequencies change with any adjustment in the speed of the equipment being monitored. Most modern vibration data collectors and software will automatically [...]
Back in July 2011, ArcelorMittal Point Lisas, Trinidad awarded TOSL’s Predictive Maintenance (PdM) Department with a one year contract for Reliability and Condition Based Monitoring. It was the first time a process like that would be implemented at ArcelorMittal. The contract is being executed by our Senior PdM technician, Mark Dwarika, and PdM technicians, Samir [...]
