Manual Example Calculation for RPN

Scenario:

• Unit: Sedimentation Unit
• Functionality: Water Inlet Management
• Assets and Failure Modes:
• • Asset ID: AS011
  • • Asset Name: Intake Pump
    • Failure Mode: Leakage
    • Probability (P): 3
    • Detectability (D): 4
  • Asset ID: AS012
  • • Asset Name: Pipe
    • Failure Mode: Corrosion
    • Probability (P): 2
    • Detectability (D): 5

Critical Parameters for the Unit:

Step 1: Calculate the Criticality Score for Each Failure Mode

The formula to calculate the Criticality Score (C) is:

C=(Pressure Score×Pressure Weightage)+(Temperature Score×Temperature Weightage)) C=(4×0.3)+(3×0.7)=1.2+2.1=3.3

Step 2: Calculate the RPN for Each Failure Mode

The formula to calculate the RPN is:

RPN=Probability (P)×Detectability (D)×Criticality Score

For Asset ID: AS011 (Leakage)

RPN=3×4×3.3=40.2

For Asset ID: AS012 (Corrosion)

RPN=2×5×3.3=33.0

Step 3: Calculate the Functionality RPN

The total Functionality RPN is the sum of all individual asset RPNs:

Functionality RPN=40.2+33.0=73.2

Final Summary:

Total Functionality RPN = 73.2

Conclusion

These APIs allow you to efficiently calculate and manage the RPN for different functionalities within a unit, ensuring better risk management and improved operational decision-making.