Re: Internal ligament inspection in economizer inlet header

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Re: Internal ligament inspection in economizer inlet header
Posted by: J. Mark Davis , E-mail: mkdavis@mindspring.com, on December 24, 1999 at 17:41 :
In Reply to: Internal ligament inspection in economizer inlet header posted by : Jacques Parent on December 23, 1999 at 17:11:
Dear Jacques,
I can address some techniques for this type of inspection using Creeping Waves and Tip Diffrcation.
If you happen to have a cut out sample I can demo some very simple techniques. I do need a sketch of your design.
If you can email a copy of a drawing and I will evaluate it prior to the class in Jnauary.
Merry Christmas

: 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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Comments:
: Dear Jacques, : I can address some techniques for this type of inspection using Creeping Waves and Tip Diffrcation. : If you happen to have a cut out sample I can demo some very simple techniques. I do need a sketch of your design. : If you can email a copy of a drawing and I will evaluate it prior to the class in Jnauary. : Merry Christmas : : : 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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