A pipe carrying steam was exposed to over temperature event for approx. 2 hrs. (180 C above the design temperature). This happened due to malfunction of VHP (very high pressure) let down valve. Results of the external visual inspection revealed that no permanent damage to the piping. However, client concerns long term structural damage to the material. What are the metallurgical tests that I should conduct to see any damage to the material?
Do I have to perform accelerated creep testing?
material grade: SA 106 B nominal size 6", schedule 80 Xtg.
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