Oil analysis is the cornerstone of effective condition-based maintenance programs. Commercial oil analysis labs play a significant role in developing these programs and can help process facilities move from maintenance programs based on responding to failures to programs based on the condition of equipment and lubricant. During a coaching session on reliability and lubrication, one plant’s maintenance personnel discussed laboratory oil analysis frequency. Like many facilities, this plant preferred to conduct their lab analyses on a quarterly basis. Although quarterly analysis is effective, waiting months to analyze lubrication poses risks for the plant. A successful oil analysis and lubrication program requires a more proactive approach that includes frequent inspections, solid maintenance training and proper monitoring accessories.
Integrated Oil Analysis
Integrating an oil analysis program is the key to early detection. However, plants often rely too heavily on analysis from outside labs. Truly effective oil analysis programs include integrated inspections and on-site screening. Equipment can suffer from several possible lubrication failures during operation. If the root causes of those failures are not addressed, the maintenance problem can quickly go from bad to worse. Ninety days is a long time to go without feedback on equipment or lubricant condition.Inspection Check Sheets
Inspectors are responsible for knowing what to look for during visual inspections. Check sheets should be highly detailed to ensure the inspection is done properly. Phrases such as “inspect machine” or “record machine condition” are not specific enough to guarantee equipment condition or safety. Inspection check sheets should define individual tasks and include enough details to inform inspectors whether or not they should move to the next level of screening. When inspecting for water in oil, for example, inspectors must follow each step of the process and record details for an accurate reading. Water co-exists in oil in three ways: free, emulsified and dissolved. In most cases, free water seeks out the lowest point in a reservoir. Free water is also fairly easy to spot because it resides separately from the lubricant. The check sheet should include the following instructions:- Inspect the oil sight glass for any sign of free water.
- If free water is visible, record the approximate amount of free water relative to the oil sight glass.
- Compare the amount of free water to the last inspection report.
- If the rate of increase of the amount of free water is abnormal, look for potential sources of ingress.