API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
5-94 API RECOMMENDED PRACTICE 581Probablitly of Loss of Containment (failures/year)10 210 1GFFT x DF10 010 -110 -210 -3DF = 1DF = 500DF = 200010 -4DF = 500010 -50.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5Pressure Ratio (Pressure/MAWP)For an example pressure vessel with:1. gff total = 3.06 × 10 −52. Design margin = 43. Estimated burst pressure of 4 × MAWPFigure 5.7—Probability of Loss of Containment as a Function of Overpressure30,000Risk Tolerance = $25,000/yearRisk Tolerance =$ 10,000/year25,000Calculated Risk, $/year20,00015,00010,0005,00000 2 4 6 8 10 12 14 16 18YearsFigure 5.8—Inspection Test Updating of PRDs
CONTENTS5.A.1 General ........................................................................................................................................... 15.A.2 References ..................................................................................................................................... 15.A.3 Determining Weibull Parameters ................................................................................................. 15.A.4 Required and Recommended Data to Perform a Weibull Analysis .......................................... 25.A.5 General Steps to Determine Weibull Parameters from an Exchanger Bundle ReliabilityLibrary ....................................................................................................................................................... 25.A.6 Example Determination of Weibull Parameters using Weibayes Analysis with a ReliabilityLibrary ....................................................................................................................................................... 35.A.7 Nomenclature ................................................................................................................................. 45.A.8 Tables ............................................................................................................................................. 55.A.9 Figures ............................................................................................................................................ 6
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5-94 API RECOMMENDED PRACTICE 581
Probablitly of Loss of Containment (failures/year)
10 2
10 1
GFFT x DF
10 0
10 -1
10 -2
10 -3
DF = 1
DF = 500
DF = 2000
10 -4
DF = 5000
10 -5
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Pressure Ratio (Pressure/MAWP)
For an example pressure vessel with:
1. gff total = 3.06 × 10 −5
2. Design margin = 4
3. Estimated burst pressure of 4 × MAWP
Figure 5.7—Probability of Loss of Containment as a Function of Overpressure
30,000
Risk Tolerance = $25,000/year
Risk Tolerance =$ 10,000/year
25,000
Calculated Risk, $/year
20,000
15,000
10,000
5,000
0
0 2 4 6 8 10 12 14 16 18
Years
Figure 5.8—Inspection Test Updating of PRDs
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