PEI Civil Glossary
- 09 Aug 2024
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PEI Civil Glossary
- Updated on 09 Aug 2024
- 3 Minutes to read
- Contributors
- Print
- DarkLight
- PDF
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Below you will find the definition / meaning for the relevant IMS PEI (Civil) terminologies.
A
Term | Meaning |
|---|---|
Age-Related degradation | Gradual reduction of asset integrity over time. |
C
Term | Meaning |
|---|---|
Civil Asset | An asset that supports process equipment or facilitates transportation. |
(Sub-) Component | A part of the asset that ensures that the asset can fulfil its function. |
Condition based maintenance | Proactive maintenance carried out according to the need indicated by conditioning monitoring. Also known as predictive maintenance. |
Condition monitoring | The continuous or periodic measurement and interpretation of data to indicate the condition of an item to determine the need for maintenance. |
D
Term | Meaning |
|---|---|
Degradation | The process during which the quality (e.g. strength) of an item reduces due to age-related causes. For instance, corrosion leads to a reduction in wall thickness of steel elements. |
Degradation Mechanism (DM) | The physical, chemical or other process that results in failure. |
Design failure | The condition of the asset is such that any load that is higher than the design load will cause failure of the asset |
Dominant Failure Mode | The event that is most likely to be responsible for the functional failure under consideration. |
E
Term | Meaning |
|---|---|
Equipment type | Asset type, such as tabletop, drainage pipe, flare asset |
Event-related failures | Non-Age-Related failures or Infant Mortality problems. These types of failure are caused by events that cause instant failure or failure occurs after a period of degradation that is relatively short as compared to the life expectancy. |
F
Term | Meaning |
|---|---|
Failure Mode | A qualitative description of the event (‘instant’) during which the item fails, how an item can fail (e.g. collapsed sheet pile wall). |
Function | A specific purpose of an entity or its characteristic action. |
Functional failure | A functional failure is the inability of the asset to fulfil a function to a standard of performance that is acceptable to the user. |
H
Term | Meaning |
|---|---|
Hidden (unrevealed) | When the Failure Mode occurs, it is not observed. |
I
Term | Meaning |
|---|---|
Infant mortality | Failure of the (asset) Component shortly after start of operation. Possible causes are for instance bad design, bad material quality, and bad workmanship. |
Inspection | Activities such as measuring, examining, testing, gauging one or more characteristics of a structural Component and comparing these with specified requirements to determine conformity. |
Interval factor | A factor, based on the Criticality and Confidence Rating, which is used to calculate the Maximum Inspection Interval. |
L
Term | Meaning |
|---|---|
Last Inspection Date | Last Inspection Date is the latest date that the critical Components of the asset have been inspected. Most recent inspection. |
Likelihood | The probability that the applicable dominant Failure Mode and its resulting consequences occurs. |
M
Term | Meaning |
|---|---|
Maintenance | The combination of all technical and associated administrative actions, including supervision actions, intended to retain an item in, or restore it to, a state in which it can perform its required function. |
Maximum Inspection Interval | Multiplying Remnant Life by the Interval Factor derives the Maximum Inspection Interval. The planned inspection interval should be equal or shorter than this. |
Mitigation | Actions undertaken to make a consequence less severe or relieves consequence. |
N
Term | Meaning |
|---|---|
Next Inspection Date | Next inspection date is the recommended date that the Civil asset is inspected. The Next Inspection Date is determined by adding the Maximum Inspection Interval to the Last Inspection Date. |
P
Term | Meaning |
|---|---|
Proactive maintenance | The planned maintenance carried out at predetermined intervals or corresponding to prescribed criteria (conditions) and intended to reduce the probability of failure or the performance degradation of an asset. Also known as preventive maintenance. |
R
Term | Meaning |
|---|---|
Reliability | The ability of an item to perform a required function under given conditions for a given time interval. |
Remnant Life | The period, since the last inspection, for which it is judged that an item or Component will remain safe to operate within the agreed operating window. |
Risk | A combination of the probability, or frequency, of occurrence of a defined hazard and the magnitude of the consequences of the occurrence. |
Risk matrix | The matrix portraying risks as a combination of probability and consequences, used as a basis for qualitative risk determination. Considerations for the assessment of probability are shown on one axis. Considerations for the assessment of consequences are shown on the other axis. Plotting the intersection of the two considerations provides an estimate of the risk. W-IMS Civil uses an adopted Shell HSE risk matrix with consequence categories People, Environment and Economy. |
S
Term | Meaning |
|---|---|
Susceptibility | A way to describe to what degree a structure is affected or influenced by a degradation mechanism. |
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