UT or RT for LNG thanks

[Brl Pp]

Good morning for all,

This preocupation is for LNG thanks (120 000 m3 capacity).

As per the contract and procedure, the radiography test (RT) is
required. My contractor needs to do the ultrasonic test (UT).

My question is:
To do the ultrasonic test (UT) or the radiography test (RT)?

Tanks in advance and have a nice day.

Redouane (Project engineer)
Algeria

[manoj vernekar]

Hi

 

NDT requirements should be  clearly specified in client specification.

Shell requirement is 100% RT and 100% Tee and long seam.

regards

 

manoj

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Manoj.Vernekar

[Marcelo P. Soriano Qa/Qc Eng'r.]

try to check your project specs i am sure that is mention there the
limitation of rt and ut. some points is base in the thickness of
material.

marcelo

On Dec 6, 6:50 am, manoj vernekar <manojverne...@gmail.com> wrote:
> Hi
>
> NDT requirements should be  clearly specified in client specification.
> Shell requirement is 100% RT and 100% Tee and long seam

> regards
>
> manoj
>
>
>
>
>
>
>
>
>
> On Sun, Dec 5, 2010 at 10:01 PM, Brl Pp <refazosa...@gmail.com> wrote:
> > Good morning for all,
>
> > This preocupation is for LNG thanks (120 000 m3 capacity).
>
> > As per the contract and procedure, the radiography test (RT) is
> > required. My contractor needs to do the ultrasonic test (UT).
>
> > My question is:
> > To do the ultrasonic test (UT) or the radiography test (RT)?
>
> > Tanks in advance and have a nice day.
>
> > Redouane (Project engineer)
> > Algeria
>
> > --
> > To post to this group, send email to material...@googlegroups.com
> > To unsubscribe from this group, send email to

> > materials-weld...@googlegroups.com<materials-welding%2Bunsu...@googlegroups.com>

[pgoswami]

Hi Redouane,

ASME allows UT in lieu of RT but not as a blanket approval.Under the above code case on a specific case by case basis this change of NDE technique is acceptable. But the UT technique should not be conventional pulse echo type, it has to be state of art digitized UT techniques such as TOFD or Phased Array.

If the design code for the LNG tank is API-620, then the following is the selection criteria of UT in lieu of RT.

7.15.3 Ultrasonic Examination Method

7.15.3.1 Ultrasonic Examination in Lieu of Radiography:-When ultrasonic examination is applied in order to fulfill the requirements of 5.26, Q.7.6, or R.7.6, the provisions of Appendix U shall apply. Appendix U also talks about the NDE techniques mentioned above.

Let me know, if it helps.

Thanks.

Pradip Goswami,P.Eng.,IWE.
Welding & Metallurgical Specialist & Consultant
Email-p...@sympatico.ca,
pgos...@quickclic.net

-----Original Message-----
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Marcelo P. Soriano Qa/Qc Eng'r.

> > materials-weld...@googlegroups.com>

> > For more options, visit this group's bolg at
> >

http://materials-welding.blogspot.com/

> > 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.
>
> --
> Manoj.Vernekar

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[Brl Pp]

PGOSWAMI,
Good morning,

Thank you for your answer,

Yes, you are right and I agree with you, the appendix U of API 620
code is very clear, but my opinion it is of not tolerated with my
contractor.

Actually my contractor wants to use UT in place RT for the reasons of
cost because UT is not expensive than RT.

Further to your answer I have to communicate the appendix U of the
code API 620 in races of technique one following of course the
contractual clauses.

Please I want a piping cleaning specification for heat exchanger.

PS: I am sorry to put the similar conversations because I am not
qualified in the quality control and during my career I am only
in the management of project. Also sorry about my English because in
Algeria the French language is prime

Thank you PGOSWAMI and have a good day

My best regards
REDOUANE (Engineer of project)
SONATR ACH – Algeria

2010/12/7, pgoswami <pgos...@quickclic.net>:

[manoj vernekar]

Redouane

 

first you have to see the contract, than specification.

 

If at all you are looking for quality job. 100 % RT (combination of fast and low speed film)on all butt weld long seam and C seam. and 100% UT on long seam and Tee joins.

 

UT RTT ,creep wave probe and zone wise and axial probe movement, and you required LNG experience UT technisions.

 

regards

 

manoj

 

On Tue, Dec 7, 2010 at 10:52 AM, Brl Pp <refaz...@gmail.com> wrote:

PGOSWAMI,
Good morning,

Thank you for your answer,

Yes, you are right and I agree with you, the appendix U of API 620
code is very clear, but my opinion it is of not tolerated with my
contractor.

Actually my contractor wants to use UT in place RT for the reasons of
cost because UT is not expensive than RT.

Further to your answer I have to communicate the appendix U of the
code API 620 in races of technique one following of course the
contractual clauses.

Please I want a piping cleaning specification for heat exchanger.

PS: I am sorry to put the similar conversations because I am not
qualified in the quality control and        during my career I am only
in the management of project. Also sorry about my English because in
Algeria the French language is prime

Thank you PGOSWAMI and have a good day


My best regards

c (Engineer of project)

--
Manoj.Vernekar

[K K]

Dear Sir,

According to API 650 Appendix U.

If We will not use the Ultrasonic Examination in Lieu of Radiography. We have sufficient resources to complete the NDT requirement with RT.

Then can we accept the procedure?

Regards 

Kiran

] On Behalf Of Marcelo P. Soriano Qa/Qc Eng'r.

> > material...@googlegroups.com<materials-welding%2Bu
> > material...@googlegroups.com>

> > For more options, visit this group's bolg at
> >

http://materials-welding.blogspot.com/

> > 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.
>
> --
> Manoj.Vernekar

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[SENTHILKUMAR SWAMINATHAN]

Perform RT on the said weld is Acceptable. If you want to do UT, then meet the Appx - U requirement is mandatory. 

Regards, S.SENTHILKUMAR

https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
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