![]() ![]() 7.2.2 Primary Containment Inspection or Testing Results Outside Acceptable Limits 7.2.2.1 Indicator Definition An inspection or test finding that indicates primary containment equipment has been operated outside acceptable limits. These excursions should be counted as a single Tier 3 PSE. A process condition that hovers near the SOL value may result in multiple excursions. site-wide failure of a utility) and each excursion should be counted as a separate Tier 3 PSE. A single initiating event may result in multiple SOL excursions (e.g. A Company may want to record the duration of individual SOL excursions and may even calculate the total duration of all SOL excursions. The predetermined action may range from manually executed operating procedures to a fully automated safety instrumented system.ħ.2.1.2 Indicator Data Capture A Tier 3 PSE is counted for each SOL excursion that occurred in a specified time period. Exceeding the SOL represents the point beyond which troubleshooting ends and pre-determined action occurs to return the process to a known safe state. Figure 3 depicts the relationship between normal operating limits, high/low alarm limits, and the SOL. regeneration or steps in a batch process) may have different SOLs for the same equipment. 7.2 Examples of Tier 3 PSEs 7.2.1 Safe Operating Limit Excursions 7.2.1.1 Indicator Definition A process parameter deviation that exceeds the safe operating limit (SOL) applicable to the phase of operation. A Company shall develop and use Tier 3 Indicators. or identify others that are meaningful to its operations. A Company may use all or some of the example indicators below: - safe operating limit excursions - primary containment inspection or testing results outside acceptable limits - demands on safety systems - other LOPCs. Tier 3 indicators are intended for internal Company use and can be used for local (site) public reporting. Indicators at this level provide an additional opportunity to identify and correct weaknesses within the barrier system. API RP 754-2010 pdf free download.Process Safety Performance Indicators for the Refining and Petrochemical Industries.ħ Tier 3 Performance Indicators-Challenges to Safety Systems 7.1 Purpose of Indicator A Tier 3 PSE typically represents a challenge to the barrier system that progressed along the path to harm, but is stopped short of a Tier 1 or Tier 2 LOPC consequence. ![]()
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