Failure Modes Sample Clauses

Failure Modes. At any given time, there are four major failure modes acting upon an asset. These are defined in Error! Reference source not found. 3. Table 3. Major Failure Modes and Their Definitions Physical Mortality Physical degradation of an asset reduces performance below an acceptable level Capacity The volume of demand exceeds the design capacity Financial Efficiency Operations and maintenance costs exceed that of feasible alternatives Levels of Service Functional requirements exceed specified performance criteria of the asset (e.g., the treatment technology used for the removal of a pollutant no longer removes enough of the pollutant to meet permit requirements) While all four major failure modes may be acting on an asset at any given time, the asset will experience failure due to only one failure mode, referred to as the imminent failure mode. Our approach identifies the imminent failure mode and recommends corrective action to intervene before the asset’s failure. Generally, unless the external environmental demands change, the imminent failure mode is physical mortality. As a result, the failure mode of physical mortality is used predominantly for long term asset renewal decision making. Therefore, an asset’s physical condition is the predominant factor for estimating the remaining useful life of an asset. The remaining failure modes are more closely aligned with performance and will be included in the performance evaluation included in this task. This task will focus on developing condition assessment protocols for the City’s WWTP and lift station assets. The written Level 2 condition assessment protocols will be utilized in on-site field inspections as described in Table 5. All assets in the asset register will be assigned a condition rating score from 1 to 5, an example of which is shown in Table 4. The 1 to 5 rating translates directly to a 1 to 5 probability of failure (POF) score that will be used in the risk analysis in Task 6. Table 4. Example Condition Rating Descriptions