PAUT Instead of RT

[williams p wilson]

Dear Experts,

Please guide, RT can be replaced with PAUT for a vessel constructed with ASME Section VIII Div.1, MOC : SA 516 Gr.70, 70 / 80 mm Thickness.

Thank You & Regards

Williams P Wilson

+968-94600828

QA/QC Engineer

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[Raghuram Bathula]

yes, refer UW (51(a)(4)

[anthony chundal]

Yes it can be done

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[srinivas rao]

PAUT can be used in place of  RT and allowed as per ASME SEC VIII DIV 1, check your weld quality before jumping to this mecthod and it is  better than RT and with more precision to detect defects. However  you need check with your NDT crew or your NDT sub contractors are they having compitent personal to perfrom  it is very important that the person who is  perfrom this shall be skilled enoughed to operate machines for  performing & interpreting results and all the welds in the vessel cannot have sufficient space on either side of the welds for scanning and hence interpretation of results may be difficult in case proper calibration and validation blocks are not place.

please refer ASME Code cases that are allowing  PAUT  in the lieu of RT 

you require to demostrate  PAUT mock up prior to NDE test to your client and AI. no of blocks will differ based on your scope take opion of your LEVEL III.

Thanks 

Rao

[williams p wilson]

Dear Sir,

Thanks for sharing the information.

This job will undergo RN1, SR1 & SR2 - Generally which stage will do the PAUT, No any information from client.

Thank You & Regards

Williams P Wilson

+968-94600828

QA/QC Engineer

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[srinivas rao]

if this PQR test coupon No NDE is required  since mechanicla testing will be performed on this coupons .... 

however pls check your client specification that they may insist sam type of NDE will be performed for PQR coupons on case to case basis.

for PQR test coupons do NDE before PWHT and than u can send it fro mechnaicla testing ... confirm the same with your client.

Regards,

Srinivas Rao

[srinivas rao]

 if client is not specified any requiremnt of NDE before or after PWHT , it shall understand that NDT shall be carried out  after PWHT only. 

NDT before PWHT can be avioded based on your confidence over your welding .. to gain convidence before avioding NDT before PWHT you can take 5%  or 10% NDT before PWHT ...

Regards,

Srinivas Rao

On Thursday, October 13, 2022 at 9:34:09 AM UTC+4 williamswilsonp wrote:

[Sourav Bohrays]

reason for ndt before any heat treatment are

1.to avoid repair after heat treatment.

2.repair affect quality of weld.makes haz more hard n hard -loss of ductility- chances of BCT .

3.new qualification require to attend repair if job require heat treatment.

4.economical raises cost of welding consumable,heat treatment,production time

Regards

Sourav Bohray

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[pgos...@rogers.com]

Hello Williams,

 

Sec VIII, DIV-1 allows PAUT in lieu of RT, subject to the fulfilment of the following clauses. Requirements are well documented. A competent organization, with qualified personnel and similar experiences are the key. Interpretation of PAUT is not very easy, defect sizing and acceptance requires skill. In RT you’re able to see the actual defect size, while in PAUT like any other UT technique it’s all signals.

 

In order to convince the inspector (AI) the actual clauses  and reasons for not doing RT should be well referred in your proposal.

 

Thanks.

 

Pradip Goswami.P.Eng, IWE.

Cell/Whasapp:1-905-9793232

 

 

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