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Software CivilFEM General Purpose Finite Element Analysis (FEA) InterPlan Systems Inc. MatrixOne MPC Proprietary Software (for project members) MTI Commercial Software MVP Project™ NASA Tech Briefs Software Center Other Commercial Software Risk-Based Assessment API RBI Software RISKWISE™ Software USITUTOR(TM) for Windows Help What is Fitness For Service? What is API RP 579? What is API Std 1160? API-579 provides a number of useful solutions for Stress Intensity Factor. These appear to address crack-like flaws in plate. I have not been able to find recommendations for dealing with crack-like flaws at toes of butt welds. In PD-6493, they provide Mk to address cracks at toes of welds. For shallow flaws, Mk may have values of 2.0 or more. Fatigue cracking at a weld toe is a common issue and an Mk of 2.0 will have a dramatic effect on remaining life or inspection period estimates. Are you aware of any provisions in API 579 that address this issue? Regards, Bill Buchter. How do I use the API 579 Failure Assessment Diagram (FAD) to evaluate a crack-like flaw? Contact Us