Materials & Welding

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 This message contains confidential information. To know more, please click on the following link: http://disclaimer.bureauveritas.com

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 opera...

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 th...

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 ...

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 -- You received this message because you are subscribed to the G...

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...

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  -- You received this message because you are subscribed to the Google Groups "Materials & Welding" group. To unsubscribe fro...

Dear Salman Sir, please note that being working professionally there is no space for such things like """ ask yourself '"" . Y ou, 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: ...

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 ...

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  --...

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 ...

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 ...

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 H owever the integrity of UNS S31254 is a crucial factor in any offshore application (I assume it'...

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-...