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Internal ligament inspection in economizer inlet header

Posted by: Jacques Parent Profile (PID_338), E-mail: jacques.parent@ontariopowergeneration.com, on December 23, 1999 at 17:11 :

I am looking for any information, paper, link or past experience on internal ligament inspection in economizer inlet header.
Our company has experience of cracking in the economizer inlet header due to a corrosion-fatigue mechanism. The fatigue component resulting from thermal stresses generated by the admission of relatively cold feedwater into hot headers.
We have discovered:
-Longitudinal cracking in the tube stub
-Cracking in the tube hole running parallel to the axis of the hole
-Cracking from the internal lip of the hole toward adjacent holes in both longitudinal and circumferential directions (ligaments)

We need an inspection technique to detect and size the trough-wall depth of the cracks.

Thank you for your help
jp

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