API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-163
24.10 Figures
STEP 1: Determine Base Damage Factor for
previous failures.
Number of
Failures
STEP 2: Determine Base Damage Factor for
visible/audible shaking.
Severity of
Shaking
STEP 3: Determine Adjustment Factor for visible/
audible shaking.
Amount of
time spent
Shaking
STEP 4: Determine Base Damage Factor for cyclic
loading.
Type of
Cyclic
Loading
STEP 5: Determine the Base Damage Factor using
Equation 2.92.
STEP 6: Determine the final value of the damage
factor using Equation 2.93.
Figure 24.1—Determination of the Piping Mechanical Fatigue DF