Calculate pipeline critical defect length and fracture toughness from flow stress and hoop stress (AS 2885.1 Section 4.8.5). `
`The critical defect length is calculated using the Folias factor Mt. The required fracture toughness and CVN to prevent fracture are calculated from the initiation defect length. The inititation defect length is normally taken as 80% - 90% of the critical defect length.
Tool Input
- schdtype : Pipe Schedule Type
- diamtype : Pipe Diameter Type
- ODu : User Defined Outside Diameter
- IDu : User Defined Inside Diameter
- wtntype : Wall Thickness Type
- tnu : User Defined Wall Thickness
- ttoltype : Fabrication Tolerance Type
- xu : User Defined Negative Wall Thickness Fraction
- Hu : User Defined Negative Wall Thickness Allowance
- modptype : Pipe Material Type
- Eu : User Defined Pipe Elastic Modulus
- idltype : Inititation Defect Length Type
- Fiu : User Defined Initiation Defect Length Factor
- IDLu : User Defined Initiation Defect Length
- G : Corrosion Allowance
- Sf : Flow Stress
- Sh : Hoop Stress
- Ac : Charpy Test Piece Fracture Area
Tool Output
- CDL : Critical Defect Length
- CVG : Convergence Factor
- CVN : Charpy V Notch Fracture Energy
- E : Young's Modulus
- H : Wall Thickness Fabrication Allowance
- ID : Pipe Inside Diameter
- IDL : Inititation Defect Length (< CDL)
- Mt : Folias Factor
- OD : Pipe Outside Diameter
- OD/tn : Pipe Diameter Over Wall Thickness Ratio
- Sf/Sh : Flow Stress Over Hoop Stress Ratio (> 1)
- tm : Minimum Fabrication Wall Thickness
- tn : Nominal Wall Thickness
- tw : Pressure Design Wall Thickness
- xf : Wall Thickness Fabrication Fraction