7-Criticality Assignment for Maintenance.pptx

Criticality Assessment strategy

1. Criticality Assignment 15 – 17 December 2015

2. 2 Objectives A methodical approach to classify equipment priority from maintenance perspective Introduction of maintenance based risk matrix Provides guidance on consequence and likelihood assessment for routine and specific scenarios Selection of appropriate maintenance strategy in accordance with criticality assignment

3. When to perform criticality assignment Pre-Requisites for criticality: MEL H&E register SIL levels Process Description MOC 3

4. Equipment Criticality Assignment Specific to Maintenance Criticality Assessment 4

5. 5 Start Timing for Criticality Assessment Assign Team Data Gathering and Review Is E.U. HSE&B-CES? Subunit /Equipment unit is PSV ? or or Restriction Orifice ( for protection integrity containment)? or Blow down valve with relief limits? or SIF as SIL1 or Higher Define Equipment Unit Boundary Define Functions No No No Perform Consequence Assessment Perform Likelihood Assessment Likelihood rating Map likelihood and consequence rating on risk matrix High Low Medium Consequence Severity Determine Criticality Level Yes Yes In accordance with AIMS

6. Key Takeaways Review all functional Locations For HSE&B-CES, use Integrity classification (the rating will be assigned high by default) For Non-HSEBCS; define equipment boundary and associated functions Perform consequence assessment and likelihood analysis for each function Take credit for built-in redundancy and delayed impact Use MTBF data for likelihood calculation. The criticality assignment will be done by cross functional team 6

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