The evaluation within a visual inspection occurs at two levels:
- Failure assessment for inspection guidelines.
- Asset condition assessment.
Failure assessment for inspection guidelines
The evaluation of failures in the guidelines, the inspector must do them during the visual inspection. Fault states can be:
No signs or symptoms are displayed to indicate the fault in the analysis.
There are signs or symptoms of failure. Its level of deterioration is moderate or there is no evidence of imminent damage from a functional failure of the asset.
There are signs or symptoms of failure. There is a possibility of imminent functional failure of the asset.
There are no signs or symptoms that can show the status of the failure or that failure could not be detected with vibration analysis on that asset.
Asset condition assessment
The inspector must evaluate the general condition of the asset. There are different criteria that can be followed. Although, the basis of the general state of the asset is the detection of failures in the Inspection Guidelines, each failure in its respective inspection point has a weight or criticality in the global evaluation of the asset.
Based on the evaluations of the Inspection Guidelines, the evaluation of the faults found and the trend of conditions, the asset must be evaluated according to ISO 10816, which also includes the following states in which the condition of an asset can be classified according to its severity level:
The machine is considered as newly commissioned or reconditioned. The measured levels are within the limits specified in the standards; data analyzed is correct for the operating conditions of the machine and its associated phenomena (hydraulic, mechanical and electrical). No failure or malfunction components detected for the analyzed elements. No significant increase in the measured levels compared to previous measurements.
Measured levels may be higher than those set by the relevant standards or similar machines, but do not represent any risk to the machine; levels observed are typical for an asset operating in these conditions. No failure or malfunction component observed. Increases in measured levels from previous measurements are not significant.
Measured levels may be higher or even lower than those set by the standards although malfunctioning components are observed. They have not produced yet a failure but represent a risk to the machine operation in the future. Increases in measurement levels from the previous measures may be tiny or moderate. It recommends the closest monitoring of the asset and even intervention to check on it.
Measured levels are generally excessive or higher than those set by the standards, observed malfunction and even failure components, which represent a clear risk of damage in the machine. Increases of the measured levels from the previous measures can be important. Immediate implementation of actions in the machine aimed at the elimination of observed faulty phenomena is recommended. Damage assessment and testing to verify the quality of the action made.
The asset is not accessible or does not meet the requirements to take the necessary measures to analyze its condition.