Quick Answer
Calculate Process Safety Barrier Independence Integrity Score
Calculator
Result Interpretation
Process Safety Barrier Independence Integrity Score Calculator computes Barrier Independence Integrity Score in dimensionless using the defined engineering formula and the input values provided.
Worked Example
Verified calculation
Given:
- Average Probability of Failure on Demand per barrier = 0.001
- Number of independent safety barriers = 2
- Hardware/Software Diversity Factor = 0.92
- Common Cause Failure Independence Factor = 0.85
Expected Result:
- Barrier Independence Integrity Score = 0.001563218
Engineering Interpretation:
Under the given input conditions, the calculated result is: Barrier Independence Integrity Score = 0.001563218 dimensionless.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.
Formula / Method
barrier independence integrity score = (1.0 - pow(1.0 - average probability of failure on demand per barrier, number of independent safety barriers)) * hardware/software diversity factor * common cause failure independence factorFormula family: formula_process_process_safety_barrier_integrity_checker
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| PFD_avg | Average Probability of Failure on Demand per barrier | INPUT | Average Probability of Failure on Demand per barrier |
| N_barriers | Number of independent safety barriers | INPUT | Number of independent safety barriers |
| diversity_factor | Hardware/Software Diversity Factor | INPUT | Hardware/Software Diversity Factor |
| independence_factor | Common Cause Failure Independence Factor | INPUT | Common Cause Failure Independence Factor |
| result | Barrier Independence Integrity Score | OUTPUT | Barrier Independence Integrity Score |
Calculation Steps
- Enter the average probability of failure on demand per barrier in dimensionless.
- Enter the number of independent safety barriers in dimensionless.
- Enter the hardware/software diversity factor in dimensionless.
- Enter the common cause failure independence factor in dimensionless.
- Step 1: Compute barrier independence integrity score.
- Read the barrier independence integrity score (dimensionless) from the results.
Engineering Summary
Calculate Process Safety Barrier Independence Integrity Score
Frequently Asked Questions
What does this calculator calculate?
The Process Safety Barrier Independence Integrity Score Calculator estimates Barrier Independence Integrity Score based on the input parameters you provide
Why is average probability of failure on demand per barrier important in this calculation?
average probability of failure on demand per barrier is directly proportional to barrier independence integrity score. When you enter average probability of failure on demand per barrier in dimensionless, the calculator uses it in the engineering formula to compute the output
How should I interpret the result barrier independence integrity score?
The calculator outputs barrier independence integrity score in dimensionless. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Average Probability of Failure on Demand per barrier (dimensionless), Number of independent safety barriers (dimensionless), Hardware/Software Diversity Factor (dimensionless), Common Cause Failure Independence Factor (dimensionless). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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