Machinery Oil Analysis - Methods, Automation & Benefits 3rd Edition
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Description
Machinery Oil Analysis uniquely presents the entire practice of oil analysis as a condition monitoring tool for machines. This in-depth analysis describes the what, when, where and how-to for:
- Machinery lubrication concepts
- Machinery failure and maintenance concepts
- Machinery, fluid and filtration failure modes
- Oil sampling and testing
- Statistical analysis and data interpretation
Examples are given to highlight each step in the sampling, testing and diagnostic process. The work presents the latest advances in technology and instrumentation, including on-line sensors and their application.
Author:
Larry A. TomsPublished:
2008Format:
HardbackPages:
506Excerpt:
1. Most industrial machines utilize filtration or are periodically serviced with filter carts. Changing internal filters almost always causes a significant loss of oil that must be made up. Dilution by new oil artificially lowers test results. This effect is proportional to the amount of oil added in relation to the capacity of the system. Small machines tend to lose a higher proportion of total volume during filter changes than large machines.
In some cases, a developing problem such as abnormal wear can be completely masked by a filter change and top-up. In addition, the new filter may exhibit different characteristics, skewing test results even further. When sampling, top-up and/or filter change occurs at the same point in the maintenance schedule, take the sample first.
2. Two of the most critical maintenance activities that impact oil data are oil makeup and change-out. All fluid and machine failure indicators are "concentration measurements". This means the "value" of parameter reported is a function of the volume in the reservoir at the time the sample is taken. Allow the volume to "fluctuate" by infrequent large makeup additions and the test data fluctuate inversely causing interpretation difficulties. Always maintain the reservoirs of operating machinery at the OEM recommended level. If the machine is a heavy oil consumer, add small volumes of makeup oil on a frequent basis. Never wait until the reservoir or sump falls to less than 90% full.
In some cases, a developing problem such as abnormal wear can be completely masked by a filter change and top-up. In addition, the new filter may exhibit different characteristics, skewing test results even further. When sampling, top-up and/or filter change occurs at the same point in the maintenance schedule, take the sample first.
2. Two of the most critical maintenance activities that impact oil data are oil makeup and change-out. All fluid and machine failure indicators are "concentration measurements". This means the "value" of parameter reported is a function of the volume in the reservoir at the time the sample is taken. Allow the volume to "fluctuate" by infrequent large makeup additions and the test data fluctuate inversely causing interpretation difficulties. Always maintain the reservoirs of operating machinery at the OEM recommended level. If the machine is a heavy oil consumer, add small volumes of makeup oil on a frequent basis. Never wait until the reservoir or sump falls to less than 90% full.
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