Re: [MW:16541] UT- DAC curve preparation.

hi

in my experience i do 50 to 100 thickness in plate 50mm plate both
side scanning.but in pipe if u possible u take both side scanning in
50 mm .otherwise u do 100 mm thickness u draw dac for 100mm full skip
and scan bothside

thanks

indirajith

On 1/18/13, sandeep monody <smv.monody@gmail.com> wrote:
>
>
> Dear Experts,
>
> We are doing UT in 50 to 100mm thick circumferential joints of pipes using
> 75mm thick Non piping DAC block (The same has been accepted by client). UT
> operator is preparing DAC curves (for angle probes) catching echoes
> directly from *s*ide *d*rilled *h*oles (¼ t and ½ t) and catching ¾ t SDH
> echo after bouncing from opposite side.
>
> Our scanning area on weld joint is ½ to 1 ½ skip for 100mm thick weld joint
>
> but the DAC curve which is prepared as mentioned above, does not cover most
>
> of the scanning and I feel that most of echoes from discontinuity is
> missing due to the same problem.
> Please advise me to resolve this confusion
>
> Sandeep
>
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.