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

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2-18 API RECOMMENDED PRACTICE 581Table 3.2—Damage Factor Section ReferencesDF Variable DF Description SectionthinD fDF for general and localized thinning 4elinD fDF of internal inorganic, organic, and strip linings for all component types 5causticD fDF for caustic cracking 6amineD fDF for amine cracking 7sscD fDF for SSC 8HIC / SOHIC−H 2SD fDF for HIC/SOHIC cracking in H 2 S environments 9ACSCCD fDF for ACSCC 10PTAD fDF for polythionic acid cracking in austenitic stainless steel and nonferrous alloycomponents11ClSCCD fDF for ClSCC 12HSC− HFD fDF for HSC in HF environments 13HIC / SOHIC− HFD fDF for HIC/SOHIC cracking in HF environments 14extcorD fDF for external corrosion on ferritic components 15CUIFD fDF for CUI on insulated ferritic components 16ext ClSCCD f− DF for ExtClSCC on austenitic stainless steel components 17CUI − ClSCCD fDF for CUI ClSCC on austenitic stainless steel insulated components 18hthaD fDF for HTHA 19britD fDF for brittle fracture of carbon steel and low alloy components 20tempeD fDF for low alloy steel embrittlement of Cr-Mo low alloy components 21885FD fDF for 885 °F embrittlement 22sigmaD fDF for sigma phase embrittlement 23mfatD fDF for mechanical fatigue 24

RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-19Table 3.3—Management Systems EvaluationTable Title Questions Points2.A.1 Leadership and Administration 6 702.A.2 Process Safety Information 10 802.A.3 Process Hazard Analysis 9 1002.A.4 Management of Change 6 802.A.5 Operating Procedures 7 802.A.6 Safe Work Practices 8 852.A.7 Training 8 1002.A.8 Mechanical Integrity 20 1202.A.9 Pre-start-up Safety Review 5 602.A.10 Emergency Response 6 652.A.11 Incident Investigation 9 752.A.12 Contractors 5 452.A.13 Audits 4 40Total 103 1000NOTETables 2.A.1 through 2.A.13 are located in Annex 2.A.4 Thinning DF4.1 ScopeThe DF calculation for components subject to damage mechanisms that cause general or local thinning iscovered in this section. Thinning associated with external corrosion and CUI should be evaluated accordingto the procedures in Section 15.6.4 and Section 16.6.3, respectively.4.2 Screening CriteriaAll components should be checked for thinning.4.3 Required DataThe basic component data required for analysis are given in Table 4.1. Component types and requiredgeometry data are shown in Table 4.2 and Table 4.3, respectively. The data required for determination of thethinning DF are provided in Table 4.4.4.4 Basic AssumptionsIn the thinning DF calculation, it is assumed that the thinning corrosion rate is constant over time. Thiscorrosion rate is updated based on the knowledge gained from subsequent inspections (see Section 4.5.3).An A rt parameter is determined by calculating the ratio of total component wall loss (using the assignedcorrosion rate during the in-service time period) to the wall thickness.

2-18 API RECOMMENDED PRACTICE 581

Table 3.2—Damage Factor Section References

DF Variable DF Description Section

thin

D f

DF for general and localized thinning 4

elin

D f

DF of internal inorganic, organic, and strip linings for all component types 5

caustic

D f

DF for caustic cracking 6

amine

D f

DF for amine cracking 7

ssc

D f

DF for SSC 8

HIC / SOHIC−H 2S

D f

DF for HIC/SOHIC cracking in H 2 S environments 9

ACSCC

D f

DF for ACSCC 10

PTA

D f

DF for polythionic acid cracking in austenitic stainless steel and nonferrous alloy

components

11

ClSCC

D f

DF for ClSCC 12

HSC− HF

D f

DF for HSC in HF environments 13

HIC / SOHIC− HF

D f

DF for HIC/SOHIC cracking in HF environments 14

extcor

D f

DF for external corrosion on ferritic components 15

CUIF

D f

DF for CUI on insulated ferritic components 16

ext ClSCC

D f

− DF for ExtClSCC on austenitic stainless steel components 17

CUI − ClSCC

D f

DF for CUI ClSCC on austenitic stainless steel insulated components 18

htha

D f

DF for HTHA 19

brit

D f

DF for brittle fracture of carbon steel and low alloy components 20

tempe

D f

DF for low alloy steel embrittlement of Cr-Mo low alloy components 21

885F

D f

DF for 885 °F embrittlement 22

sigma

D f

DF for sigma phase embrittlement 23

mfat

D f

DF for mechanical fatigue 24

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