Re: [MW:31143] Re: 8541] Re: UT or RT for LNG thanks

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

On Tuesday, 14 July, 2020, 09:08:50 am IST, K K <karan.hbl@gmail.com> wrote:

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 Tuesday, December 7, 2010 at 9:19:17 AM UTC+5:30, pgoswami wrote:

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:materials-welding@ googlegroups.com] On Behalf Of Marcelo P. Soriano Qa/Qc Eng'r.
Sent: Monday, December 06, 2010 12:13 PM
To: Materials & Welding
Subject: [MW:8541] Re: UT or RT for LNG thanks

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
> > 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

--
To post to this group, send email to material...@ googlegroups.com
To unsubscribe from this group, send email to 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.

--
https://materials-welding.blogspot.com/
https://www.linkedin.com/groups/122787
---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-welding+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/materials-welding/3ae63611-4492-4d12-a28d-68e0fefca63co%40googlegroups.com.

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

Hi, You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this. Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime. Again, these simulated no. Of cycles shall be specified in MTC. The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case). One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example. In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...

Materails FAQs

Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...

Materials & Welding

Search This Blog