1. What is Fitness For Service? Find answer.

2. What is API RP 579? Find answer.

3. What is API Std 1160? Find answer.

4. 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 M_k to address cracks at toes of welds. For shallow flaws, M_k may have values of 2.0 or more. Fatigue cracking at a weld toe is a common issue and an M_k 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. Find answer.

5. How do I use the API 579 Failure Assessment Diagram (FAD) to evaluate a crack-like flaw? See example.

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