RE: [MW:23631] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

true because of sensitization
but the image of the vessel indicates iron contamination

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor

I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE

Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
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RE: [MW:23630] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

I definitely agree with the below statement.

From corrosion testing we have performed on 316L and 2101 duplex the HAZ on these welds are very prone to pitting and crevice corrosion due to austenite and ferrite balance.

Heat input is critical.

The elevated temperatures are definitely a factor in the corrosion equation.

With the environment  carbon pickup is definitely a factor.

 

Jim Price | Welding Engineer, CWI

Direct:  320.7463439 | Fax: 417-862-5564

jimprice@polarcorp.com

 

 

 

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Alan Denney
Sent: Wednesday, September 30, 2015 6:44 AM
To: materials-welding@googlegroups.com
Subject: [MW:23629] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

 

From this I understand that it is a 316L vessel which is exposed in an offshore marine environment and has a nominal operating temperature of up to 40 degrees C and after 5 years exposure is showing signs of external pitting corrosion. I believe the reason why this has occurred is straightforward; it is operating at a temperature and in an environment where pitting is inevitable. The critical pitting temperature of 31L stainless steel is about 15 degrees C in a chloride bearing environment for solution treated 316L. Although 316L is used in marine environments it performs without pitting only at moderate temperatures [and even at moderate temperatures it will show signs of corrosion in crevices] . I also suspect the steel temperature may be higher than the greatest ambient/operating temperature of 40 deg C due to solar gain, which makes the situation worse. Alongside the welds you may be suffering crevice corrosion. Iron contamination could also be a factor particularly with some of those surface lines away from welds due to contact with carbon steel materials.

 

In my view it comes down to understanding the environment in which the material is to be exposed, (marine and high temperature relative to CPT) and the limitations of 316 stainless steel. There is a lot of information on the web if you do a search. The material selection is hence wrong for the external environment, or the tank should have been painted – yes you do paint stainless steel!

 

Alan Denney

AKD Materials Consulting Ltd

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: 30 September 2015 10:55
To: pgoswami <pgoswami@quickclic.net>
Cc: <materials-welding@googlegroups.com> <materials-welding@googlegroups.com>
Subject: [MW:23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

 

Dear Sir,

 

It's is a corrosion inhibitor storage tank for subsea pipeline project , 

 

operating temperature is 40degree Celsius ,

Operating pressure.     Is .7KPA

Chemical is injected inside the tank , as per design data sheet there is no insulation.

 

Now I have planned to visit the location and provide more information in environmental condition,

Almost 5years completed and dispatched the job.

P.NEILASHKUMAR 

Sent from my iPad

MOB : 966 533098265

            91+9952110791

On Sep 30, 2015, at 5:27 AM, pgoswami <pgoswami@quickclic.net> wrote:

Hi Neileshkumar,

What're the surrounding operating or environmental conditions around the tank. Are there any acid fumes involved. Looks like this tank was not insulated at all??? Is that true.

Appreciate more information on the operating conditions.

 

Thanks

 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist
Hamilton, Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
ca.linkedin.com/pub/pradip-goswami/5/985/299

-----Original Message-----
From: Neilash Kumar [mailto:neilashkumar@yahoo.com]
Sent: Tuesday, September 29, 2015 2:45 AM
To: Pgosami Sir; Pgosami sir
Subject: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Dear Sir,

Good Morning, please find the attached tank drawing fabricated by us for our client & it is corroded fully , Can you please clarify,

1. Why the tank are corroded So fast?
2. Can you please advise us the method to stop /reduce the rate of corrosion by applying a top coat &  what type of coating to be applied?

please advise me . Material is 316L tank.

Regards
P.Neilashkumar

<Tank Corrosion.pdf>

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[MW:23629] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

From this I understand that it is a 316L vessel which is exposed in an offshore marine environment and has a nominal operating temperature of up to 40 degrees C and after 5 years exposure is showing signs of external pitting corrosion. I believe the reason why this has occurred is straightforward; it is operating at a temperature and in an environment where pitting is inevitable. The critical pitting temperature of 31L stainless steel is about 15 degrees C in a chloride bearing environment for solution treated 316L. Although 316L is used in marine environments it performs without pitting only at moderate temperatures [and even at moderate temperatures it will show signs of corrosion in crevices] . I also suspect the steel temperature may be higher than the greatest ambient/operating temperature of 40 deg C due to solar gain, which makes the situation worse. Alongside the welds you may be suffering crevice corrosion. Iron contamination could also be a factor particularly with some of those surface lines away from welds due to contact with carbon steel materials.

 

In my view it comes down to understanding the environment in which the material is to be exposed, (marine and high temperature relative to CPT) and the limitations of 316 stainless steel. There is a lot of information on the web if you do a search. The material selection is hence wrong for the external environment, or the tank should have been painted – yes you do paint stainless steel!

 

Alan Denney

AKD Materials Consulting Ltd

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: 30 September 2015 10:55
To: pgoswami <pgoswami@quickclic.net>
Cc: <materials-welding@googlegroups.com> <materials-welding@googlegroups.com>
Subject: [MW:23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

 

Dear Sir,

 

It's is a corrosion inhibitor storage tank for subsea pipeline project , 

 

operating temperature is 40degree Celsius ,

Operating pressure.     Is .7KPA

Chemical is injected inside the tank , as per design data sheet there is no insulation.

 

Now I have planned to visit the location and provide more information in environmental condition,

Almost 5years completed and dispatched the job.

P.NEILASHKUMAR 

Sent from my iPad

MOB : 966 533098265

            91+9952110791

On Sep 30, 2015, at 5:27 AM, pgoswami <pgoswami@quickclic.net> wrote:

Hi Neileshkumar,

What're the surrounding operating or environmental conditions around the tank. Are there any acid fumes involved. Looks like this tank was not insulated at all??? Is that true.

Appreciate more information on the operating conditions.

 

Thanks

 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist
Hamilton, Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
ca.linkedin.com/pub/pradip-goswami/5/985/299

-----Original Message-----
From: Neilash Kumar [mailto:neilashkumar@yahoo.com]
Sent: Tuesday, September 29, 2015 2:45 AM
To: Pgosami Sir; Pgosami sir
Subject: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Dear Sir,

Good Morning, please find the attached tank drawing fabricated by us for our client & it is corroded fully , Can you please clarify,

1. Why the tank are corroded So fast?
2. Can you please advise us the method to stop /reduce the rate of corrosion by applying a top coat &  what type of coating to be applied?

please advise me . Material is 316L tank.

Regards
P.Neilashkumar

<Tank Corrosion.pdf>

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Re: [MW:23628] Filler wire for EN 10088-2 X2CrNiN18-7 for (MAG -135 welding process)

On 30 September 2015 at 14:19, Vijay Katkar <katkar.vijay22@gmail.com> wrote:

What is the AWS classification & UTS value of it?

Thank you

Vijay Katkar

On Tue, Sep 29, 2015 at 2:31 PM, Raghuram Bathula <raghurambathula@gmail.com> wrote:

Why not with NiCrMo type?

On 29 September 2015 at 12:35, Vijay Katkar <katkar.vijay22@gmail.com> wrote:

Dear All,

Need your guidance on subjected topic.

I need filler which will be use to weld X2CrNiN18-7 material (equivalent ASTM material 301NL (Which has 550 MPa minimum tensile requirement).

Generally we use ER 308L material to weld this material but as per EN 10088-2, we need minimum tensile value 650MPa.

Tensile value for Filler wire- ER 308L is 520MPa minimum. 

We have some PQR which is less than 650 MPA, so it can not be use.

I checked Filler wire MTC which has 610 MPa tensile value (less than requirement).

So which filler wire can be suitable to weld this material.

Please provide your valuable reply.

Thank you

Vijay Katkar

-

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Re: [MW:23627] Filler wire for EN 10088-2 X2CrNiN18-7 for (MAG -135 welding process)

What is the AWS classification & UTS value of it?

Thank you

Vijay Katkar

On Tue, Sep 29, 2015 at 2:31 PM, Raghuram Bathula <raghurambathula@gmail.com> wrote:

Why not with NiCrMo type?

On 29 September 2015 at 12:35, Vijay Katkar <katkar.vijay22@gmail.com> wrote:

Dear All,

Need your guidance on subjected topic.

I need filler which will be use to weld X2CrNiN18-7 material (equivalent ASTM material 301NL (Which has 550 MPa minimum tensile requirement).

Generally we use ER 308L material to weld this material but as per EN 10088-2, we need minimum tensile value 650MPa.

Tensile value for Filler wire- ER 308L is 520MPa minimum. 

We have some PQR which is less than 650 MPA, so it can not be use.

I checked Filler wire MTC which has 610 MPa tensile value (less than requirement).

So which filler wire can be suitable to weld this material.

Please provide your valuable reply.

Thank you

Vijay Katkar

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[MW:23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Dear Sir,

It's is a corrosion inhibitor storage tank for subsea pipeline project , 

operating temperature is 40degree Celsius ,

Operating pressure.     Is .7KPA

Chemical is injected inside the tank , as per design data sheet there is no insulation.

Now I have planned to visit the location and provide more information in environmental condition,

Almost 5years completed and dispatched the job.

P.NEILASHKUMAR 

Sent from my iPad

MOB : 966 533098265

            91+9952110791

On Sep 30, 2015, at 5:27 AM, pgoswami <pgoswami@quickclic.net> wrote:

Hi Neileshkumar,

What're the surrounding operating or environmental conditions around the tank. Are there any acid fumes involved. Looks like this tank was not insulated at all??? Is that true.

Appreciate more information on the operating conditions.

 

Thanks

 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist
Hamilton, Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
ca.linkedin.com/pub/pradip-goswami/5/985/299

-----Original Message-----
From: Neilash Kumar [mailto:neilashkumar@yahoo.com]
Sent: Tuesday, September 29, 2015 2:45 AM
To: Pgosami Sir; Pgosami sir
Subject: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Dear Sir,

Good Morning, please find the attached tank drawing fabricated by us for our client & it is corroded fully , Can you please clarify,

1. Why the tank are corroded So fast?
2. Can you please advise us the method to stop /reduce the rate of corrosion by applying a top coat &  what type of coating to be applied?

please advise me . Material is 316L tank.

Regards
P.Neilashkumar

<Tank Corrosion.pdf>

Re: [MW:23625] Electrode Qualification Test requirement

Dear member,

Table-4 of SFA 5.1 of ASME Sec. IIC is for the tests required. You will have to refer SFA 5.1 in depth to comply those tests.

Thanks & regards,

C. R. Gandhi

---

From: mohan raj v <vmraj2001@gmail.com>
To: Materials & Welding <materials-welding@googlegroups.com>
Sent: Tuesday, September 29, 2015 11:34 PM
Subject: [MW:23618] Electrode Qualification Test requirement

Dear All, 

Please clarify for electrode qualification test as per ASME Sec II Part C for E7018 Dia-4 mm, what are the test requirements?.

As per Table 4, Fillet weld test piece is required for chemical analysis, RT, All-weld test & Impact test. Please clarify what table 4 is stating.

Further, if i make one Groove weld test assembly of 20 mm thick, is it sufficient for the electrode qualification?

Thanks & Regards,

Mohan Raj 

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Re: [MW:23624] Regarding RT before or after PWHT

Dear Salman Sir,

please note that being working professionally there is no space for such things like """ ask yourself '"" . You, me and all works/follows written guidelines. 

sometimes its very difficult to make a contractor understand the statement without having any documented proof. So, I put the question in this forum for seeking expert comment. 

No doubt, I have received many valuable feedback from experts around the world.

I really thankful to you for your feedback as well.

regards,

Ajay Kumar Kadyan

EIL

On Wed, Sep 30, 2015 at 9:47 AM, salman cader <salman96996@gmail.com> wrote:

The reason for pwht is to get rid of hydrogen cracking.......ask yourself.....is hydrogen cracking a planar defect or a volumner defect.....if its planar then you can do a rt before pwht but if the defects in hydrogen cracking is volumner too then you cant do a pwht.....

On 30 Sep 2015 13:10, "Himan Nikdin" <himan.nikdin@outlook.com> wrote:

Hi Everybody

"For P-Nos. 3, 4, and 5 materials, examination shall be performed after completion of any heat treatment" this phrase is from ANSI B31.3 para 341.3(a)  Examination Requirements.

Regards,
H.Nikdin

---

To: materials-welding@googlegroups.com
Date: Tue, 29 Sep 2015 07:29:37 +0200
From: george.dilintas@gr.bureauveritas.com
Subject: Re: [MW:23580] Regarding RT before or after PWHT

As a rule NDT has to be performed after all fabrication steps including PWHT. Some codes allow exceptions

Sent from my BlackBerry 10 smartphone.

From: Ajay Sent: Τρίτη, 29 Σεπτεμβρίου 2015 - 07:37 To: materials-welding@googlegroups.com Reply To: materials-welding@googlegroups.com Subject: [MW:23575] Regarding RT before or after PWHT

Dear Sir,

As we all aware that PWHT and RT both are different in nature, in general we perform RT after PWHT(Where PWHT is required to be perform after welding). 

However it is not written anywhere that RT is to be performed after PWHT only.

My question now is , can we perform RT first and then go for PWHT? will it be acceptable ????.

I have seen many client inspectors asked contractors to perform PWHT first then RT whereas their specifications does not say anything in this regard.

All experts are requested to throw light on the subject. Documented proof/literature , if any, to support this will be higly appreciable.

regards,

Ajay 

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RE: [MW:23623] Regarding RT before or after PWHT

The reason for PWHT is stress relief .

and occurrence of a defect if its volumetric planar or rounded has 100% nothing to do with pwht requirement .

Hydrogen Cracking (embrittlement) is the process by which metals such as steel become brittle and fracture due to the introduction and subsequent diffusion of hydrogen into the metal  This is often a result of accidental introduction of hydrogen during forming and finishing operations and totally not linked to the pwht process which will eliminate residual stresses caused by welding .

in case of occurrence of Hydrogen cracking or any sort of crack you do not proceed the joint is rejected , 

you never evaluate a crack all cracks in all codes and standards are rejected.

Last and final thing there is no such thing as ".......ask yourself....." should refer to design code and client specs or requirements and should meet those standards and follow a written procedure for pwht or any other requirement in a welding process.

Best Regards

---

Date: Wed, 30 Sep 2015 13:17:07 +0900
Subject: RE: [MW:23621] Regarding RT before or after PWHT
From: salman96996@gmail.com
To: materials-welding@googlegroups.com

The reason for pwht is to get rid of hydrogen cracking.......ask yourself.....is hydrogen cracking a planar defect or a volumner defect.....if its planar then you can do a rt before pwht but if the defects in hydrogen cracking is volumner too then you cant do a pwht.....

On 30 Sep 2015 13:10, "Himan Nikdin" <himan.nikdin@outlook.com> wrote:

Hi Everybody

"For P-Nos. 3, 4, and 5 materials, examination shall be performed after completion of any heat treatment" this phrase is from ANSI B31.3 para 341.3(a)  Examination Requirements.

Regards,
H.Nikdin

---

To: materials-welding@googlegroups.com
Date: Tue, 29 Sep 2015 07:29:37 +0200
From: george.dilintas@gr.bureauveritas.com
Subject: Re: [MW:23580] Regarding RT before or after PWHT

As a rule NDT has to be performed after all fabrication steps including PWHT. Some codes allow exceptions

Sent from my BlackBerry 10 smartphone.

From: Ajay Sent: Τρίτη, 29 Σεπτεμβρίου 2015 - 07:37 To: materials-welding@googlegroups.com Reply To: materials-welding@googlegroups.com Subject: [MW:23575] Regarding RT before or after PWHT

Dear Sir,

As we all aware that PWHT and RT both are different in nature, in general we perform RT after PWHT(Where PWHT is required to be perform after welding). 

However it is not written anywhere that RT is to be performed after PWHT only.

My question now is , can we perform RT first and then go for PWHT? will it be acceptable ????.

I have seen many client inspectors asked contractors to perform PWHT first then RT whereas their specifications does not say anything in this regard.

All experts are requested to throw light on the subject. Documented proof/literature , if any, to support this will be higly appreciable.

regards,

Ajay 

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Re: [MW:23621] Regarding RT before or after PWHT

Dear ,

Pwht is most important after welding but not for the all line .
Why because we have to identify the changes occur during welding and ...so on so many reasons.

pravez Alam
TP verifier
Air Energy
indonesia
+6289503908946

Expect the Unexpected.....

On Sep 29, 2015 11:37 AM, "Ajay" <donsaab3@gmail.com> wrote:

Dear Sir,

As we all aware that PWHT and RT both are different in nature, in general we perform RT after PWHT(Where PWHT is required to be perform after welding). 

However it is not written anywhere that RT is to be performed after PWHT only.

My question now is , can we perform RT first and then go for PWHT? will it be acceptable ????.

I have seen many client inspectors asked contractors to perform PWHT first then RT whereas their specifications does not say anything in this regard.

All experts are requested to throw light on the subject. Documented proof/literature , if any, to support this will be higly appreciable.

regards,

Ajay 

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RE: [MW:23621] Regarding RT before or after PWHT

The reason for pwht is to get rid of hydrogen cracking.......ask yourself.....is hydrogen cracking a planar defect or a volumner defect.....if its planar then you can do a rt before pwht but if the defects in hydrogen cracking is volumner too then you cant do a pwht.....

On 30 Sep 2015 13:10, "Himan Nikdin" <himan.nikdin@outlook.com> wrote:

Hi Everybody

"For P-Nos. 3, 4, and 5 materials, examination shall be performed after completion of any heat treatment" this phrase is from ANSI B31.3 para 341.3(a)  Examination Requirements.

Regards,
H.Nikdin

---

To: materials-welding@googlegroups.com
Date: Tue, 29 Sep 2015 07:29:37 +0200
From: george.dilintas@gr.bureauveritas.com
Subject: Re: [MW:23580] Regarding RT before or after PWHT

As a rule NDT has to be performed after all fabrication steps including PWHT. Some codes allow exceptions

Sent from my BlackBerry 10 smartphone.

From: Ajay Sent: Τρίτη, 29 Σεπτεμβρίου 2015 - 07:37 To: materials-welding@googlegroups.com Reply To: materials-welding@googlegroups.com Subject: [MW:23575] Regarding RT before or after PWHT

Dear Sir,

As we all aware that PWHT and RT both are different in nature, in general we perform RT after PWHT(Where PWHT is required to be perform after welding). 

However it is not written anywhere that RT is to be performed after PWHT only.

My question now is , can we perform RT first and then go for PWHT? will it be acceptable ????.

I have seen many client inspectors asked contractors to perform PWHT first then RT whereas their specifications does not say anything in this regard.

All experts are requested to throw light on the subject. Documented proof/literature , if any, to support this will be higly appreciable.

regards,

Ajay 

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[MW:23613] FW: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Hi Neileshkumar,

What're the surrounding operating or environmental conditions around the tank. Are there any acid fumes involved. Looks like this tank was not insulated at all??? Is that true.

Appreciate more information on the operating conditions.

 

Thanks

 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist
Hamilton, Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
ca.linkedin.com/pub/pradip-goswami/5/985/299

-----Original Message-----
From: Neilash Kumar [mailto:neilashkumar@yahoo.com]
Sent: Tuesday, September 29, 2015 2:45 AM
To: Pgosami Sir; Pgosami sir
Subject: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Dear Sir,

Good Morning, please find the attached tank drawing fabricated by us for our client & it is corroded fully , Can you please clarify,

1. Why the tank are corroded So fast?
2. Can you please advise us the method to stop /reduce the rate of corrosion by applying a top coat &  what type of coating to be applied?

please advise me . Material is 316L tank.

Regards
P.Neilashkumar

[MW:23612] MW:23607]-Impact test requirements of UNS 31254 as per B31.3

Hi,Mohammed Azharuddin,

As per B-31.3, UNS S 31254 is allowed for design condition up to -325 Deg F(-196 Deg C) , with the specified material properties mentioned as below(See A-1). In addition the base metal should be solution annealed.

Theoretically  as per Table -323.2.2, austenitic stainless steel welds would require impact testing  if the conditions mentioned below are not fulfilled.

One has to know the  the procurement specification for UNS 31254 pipe???

If  the pipes are impact tested in the mills @ -325 DegF  then it's deemed that subject to good welding condition and subject  to the good impact values of the welding consumables (same as base metal) , impact test would  be exempted in the weld coupons @ -120 Deg C. Also all the clauses in Table 323.2.2 needs to be fulfilled

However the integrity of UNS S31254 is a crucial factor in any offshore application (I assume it's the intended use).

If that's the case I would advise the impact to be done on the procedure qualification coupon for due diligence.

Thanks.


 
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Engineering Specialist
Hamilton, Ontario, Canada
pgoswami@quickclic.net
pradip.goswami@gmail.com
ca.linkedin.com/pub/pradip-goswami/5/985/299

A-1

A-2

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: Tuesday, September 29, 2015 10:58 AM
To: materials-welding@googlegroups.com
Subject: [MW:23607] Impact test requirements of UNS 31254 as per B31.3

Dear Experts,

I have to qualify a welding procedure for welding of UNS 31254 base metals.My design temperature is -120 degree centigrade.I am using ERNiCrMo-3 filler wire.Please advice if Impact test is required to be performed at min.design temperature?

Base metal : UNS 31254
Filler : ERNiCrMo-3
Design Temperature : -120 deg.centigrade Thickness : 5.54 & 15.54 (2 PQRS) Code : ASME B31.3

Thanks a lot

Regards,
Mohammed Azharuddin

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Re: [MW:23614] RE: 23575] Regarding RT before or after PWHT

Yes P15E very much.

On 29-Sep-2015 9:58 pm, <george.dilintas@gr.bureauveritas.com> wrote:

P-No 15E included. Example P91. For the other Pnos the Engineering has to agree for the PWHT timing. Check closer in B31.1

Sent from my BlackBerry 10 smartphone.

From: Kannayeram Gnanapandithan Sent: Τρίτη, 29 Σεπτεμβρίου 2015 - 16:47 To: materials-welding Reply To: materials-welding@googlegroups.com Subject: Re: [MW:23605] RE: 23575] Regarding RT before or after PWHT

ref B31.1, 136.4, NDE of P3,4 &5A and 5B materials welds shall be performed after PWHT. For other materials , NDE may be before or after PWHT

THANKS & BEST REGARDS,

KG.PANDITHAN, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

On Tue, Sep 29, 2015 at 1:40 PM, Ajay <donsaab3@gmail.com> wrote:

Dear Sir,

I do agree with u completely,,,,,,,,,,,,But many contractors adament to do RT after PWHT.......if any documents to support the statement would be highly appreciated.

On Tue, Sep 29, 2015 at 1:33 PM, Alan Denney <alan@denney1.freeserve.co.uk> wrote:

NDT for final acceptance will be after PWHT. However it is relatively common to perform intermediate (in-house) NDT and perform any repairs prior to PWHT.

PWHT will relieve residual stress and can open up flaws which are otherwise closed by the residual stresses, and that is the reason why NDT for acceptance purposes is performed after PWHT.

 

Alan Denney

AKD Materials Consulting Ltd

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ajay
Sent: 29 September 2015 05:03
To: materials-welding@googlegroups.com
Subject: [MW:23575] Regarding RT before or after PWHT

 

Dear Sir,

 

As we all aware that PWHT and RT both are different in nature, in general we perform RT after PWHT(Where PWHT is required to be perform after welding). 

 

However it is not written anywhere that RT is to be performed after PWHT only.

 

My question now is , can we perform RT first and then go for PWHT? will it be acceptable ????.

I have seen many client inspectors asked contractors to perform PWHT first then RT whereas their specifications does not say anything in this regard.

 

All experts are requested to throw light on the subject. Documented proof/literature , if any, to support this will be higly appreciable.

 

 

 

regards,

 

Ajay 

 

 

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