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Re: NDT before or after annealing of tubular products

Posted by: Godfrey Hands (PID_83), E-mail: godfrey@hands-ndt.co.uk, on December 15, 2003 at 08:31 :

In Reply to: NDT before or after annealing of tubular products posted by : AMSNDt , E-mail: ams@ndt-inspection.com, on December 15, 2003 at 04:17 :

----------- Start Original Message -----------
: Can someone please direct me to a Standard or Practice that clearly states that NDT should be performed after HT processes or does it matter
: Thanks
------------ End Original Message ------------

Hi,
Don't know of a standard that says NDT after HT, but it makes sense to test after HT.

HT can cause cracking in some circumstances, so you need to be sure that there are no cracks in the final product.

Depends to a great extent on the HT costs if you also test before HT.
For instance, if you test welds on a large vessel only after HT, and find a repair, then you have the HT costs again after repair.

If you test individual mass-produced small components, extra HT costs are not significant and before HT NDT can possibly be skipped.

Godfrey Hands

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----------- Start Original Message ----------- : : Can someone please direct me to a Standard or Practice that clearly states that NDT should be performed after HT processes or does it matter : : Thanks : Hi, : Don't know of a standard that says NDT after HT, but it makes sense to test after HT. : HT can cause cracking in some circumstances, so you need to be sure that there are no cracks in the final product. : Depends to a great extent on the HT costs if you also test before HT. : For instance, if you test welds on a large vessel only after HT, and find a repair, then you have the HT costs again after repair. : If you test individual mass-produced small components, extra HT costs are not significant and before HT NDT can possibly be skipped. : : Godfrey Hands ------------ End Original Message ------------

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