API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
2-16 API RECOMMENDED PRACTICE 581HIC / SOHIC−H 2SD fis the DF for hydrogen-induced cracking (HIC-H 2 S) and stress-oriented hydrogen-inducedcracking (SOHIC-H 2 S) in hydrogen sulfide servicesHSC HFD f−is the DF for hydrogen stress cracking (HSC)mfatD fis the DF for mechanical fatiguePASCCD fis the DF for polythionic acid stress corrosion cracking (PASCC)sigmaD fis the DF for sigma phase embrittlementsscD fis the DF for sulfide stress cracking (SSC)sccf govD −is the governing DF for SCCtempeD fis the DF for Cr-Mo components subject to low alloy steel embrittlementthinD fis the DF for thinningthinf govD −is the governing DF for thinningD f–totalis the total DF for a component885FD fis the DF for 885 °F embrittlementF MSgffgff totalpscoreP f (t)Scoreis the management systems factoris the GFF for discrete hole sizesis the total GFFis the management systems evaluation score expressed as a percentageis the POF as a function of timeis the score obtained from the management systems evaluation3.7 TablesTable 3.1—Suggested Component Generic Failure FrequenciesEquipment TypeComponentTypeGFF As a Function of Hole Size (failures/yr)Small Medium Large Rupturegff total(failures/yr)Compressor COMPC 8.00E-06 2.00E-05 2.00E-06 0 3.00E-05Compressor COMPR 8.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-05Heat exchangerHEXSS,HEXTS8.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-05
RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-17Equipment TypeComponentTypeGFF As a Function of Hole Size (failures/yr)Small Medium Large Rupturegff total(failures/yr)PipePipePipePumpPIPE-1,PIPE-2PIPE-4,PIPE-6PIPE-8,PIPE-10,PIPE-12,PIPE-16,PIPEGT16PUMP2S,PUMPR,PUMP1S2.80E-05 0 0 2.60E-06 3.06E-058.00E-06 2.00E-05 0 2.60E-06 3.06E-058.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-058.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-05Tank620 TANKBOTTOM 7.20E-04 0 0 2.00E-06 7.22E-04Tank620 TANKBOTEDGE 7.20E-04 0 0 2.00E-06 7.22E-04Tank620 COURSE-1-10 7.00E-05 2.50E-05 5.00E-06 1.00E-07 1.00E-04Tank650 TANKBOTTOM 7.20E-04 0 0 2.00E-06 7.22E-04Tank650 TANKBOTEDGE 7.20E-04 0 0 2.00E-06 7.22E-04Tank650 COURSE-1-10 7.00E-05 2.50E-05 5.00E-06 1.00E-07 1.00E-04FinFanVesselFINFAN TUBESFINFANHEADERKODRUM,COLBTM,FINFAN,FILTER,DRUM,REACTOR,COLTOP,COLMID8.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-058.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-05NOTE 1See References [1] through [8] for discussion of failure frequencies for equipment.NOTE 2 TANKBOTEDGE refers to the near shell region of the tank bottom and is considered to extend 24 to 30 inches inside theshell. This is consistent with most annular ring dimensions. This component type can be used for tanks with or without an annular ring.TANKBOTTOM refers to the entire tank bottom, or if a TANKBOTEDGE is modeled, it refers to the remaining part of the tank bottomthat does not include the edge component.NOTE 3 Tank620 Course components are the primary pressure boundary in the case of a double-walled tank. The secondary wallmay be considered as having an effect on leak detection, isolation and mitigation.
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RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-17
Equipment Type
Component
Type
GFF As a Function of Hole Size (failures/yr)
Small Medium Large Rupture
gff total
(failures/yr)
Pipe
Pipe
Pipe
Pump
PIPE-1,
PIPE-2
PIPE-4,
PIPE-6
PIPE-8,
PIPE-10,
PIPE-12,
PIPE-16,
PIPEGT16
PUMP2S,
PUMPR,
PUMP1S
2.80E-05 0 0 2.60E-06 3.06E-05
8.00E-06 2.00E-05 0 2.60E-06 3.06E-05
8.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-05
8.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-05
Tank620 TANKBOTTOM 7.20E-04 0 0 2.00E-06 7.22E-04
Tank620 TANKBOTEDGE 7.20E-04 0 0 2.00E-06 7.22E-04
Tank620 COURSE-1-10 7.00E-05 2.50E-05 5.00E-06 1.00E-07 1.00E-04
Tank650 TANKBOTTOM 7.20E-04 0 0 2.00E-06 7.22E-04
Tank650 TANKBOTEDGE 7.20E-04 0 0 2.00E-06 7.22E-04
Tank650 COURSE-1-10 7.00E-05 2.50E-05 5.00E-06 1.00E-07 1.00E-04
FinFan
Vessel
FINFAN TUBES
FINFAN
HEADER
KODRUM,
COLBTM,
FINFAN,
FILTER,
DRUM,
REACTOR,
COLTOP,
COLMID
8.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-05
8.00E-06 2.00E-05 2.00E-06 6.00E-07 3.06E-05
NOTE 1
See References [1] through [8] for discussion of failure frequencies for equipment.
NOTE 2 TANKBOTEDGE refers to the near shell region of the tank bottom and is considered to extend 24 to 30 inches inside the
shell. This is consistent with most annular ring dimensions. This component type can be used for tanks with or without an annular ring.
TANKBOTTOM refers to the entire tank bottom, or if a TANKBOTEDGE is modeled, it refers to the remaining part of the tank bottom
that does not include the edge component.
NOTE 3 Tank620 Course components are the primary pressure boundary in the case of a double-walled tank. The secondary wall
may be considered as having an effect on leak detection, isolation and mitigation.
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