Materials & Welding

Dear Experts, Please help review and advise on the acceptability of the attached PWHT record against ASME B31.3 clause 331.1.4 (Heating and Cooling) . From the chart, the overall PWHT cycle appears satisfactory (target/hold achieved and stable). However, there is one localized segment during the HEATING stage (T > 315°C) where the temperature ramp is steep and the heating rate appears to exceed 335°C/h (local/short-duration excursion). All other portions of the cycle look compliant. Could you please advise: Whether this single local heating-rate exceedance can be accepted as-is (engineering disposition/justification), or If not acceptable, recommended corrective actions (e.g., re-PWHT, additional NDE/metallurgical evaluation, etc.). Best Regards. ------------------------------------------------------------------- Name :        Le Dinh Hai (Mr Hai) Mobile :      Vietnam: +8497 397 1597 Email :        Dinhhaibkdn@gmail.com -- https://materials-welding.blogspot.c...

Chart is ok. It's meeting code. One more clause, in 4.5meter long , more than 40°c temperature variations also not acceptable. Sent from Outlook for Android From: materials-welding@googlegroups.com <materials-welding@googlegroups.com> on behalf of Srinivas Gundala <srinivasrao.gundala@gmail.com> Sent: Wednesday, December 31, 2025 4:56:22 PM To: materials-welding@googlegroups.com <materials-welding@googlegroups.com> Subject: Re: [MW:35939] PWHT for Piping weld joint | heating & cooling rate   Dear Hai, As you confirmed, overall, the PWHT cycle appears satisfactory, meaning that the work was completed according to the approved WPS and within the target temperature achieved, the holding time was completed, and temperature stability was maintained. However, a concern is that local fluctuations were observed in the heating phase above 315°C, which we address below. As I understood, two PWHT charts were provided, r...

Please ignore earlier mail. Socking temperature 4.6meter long , more than 140°c heating temperature variations also not acceptable, it is as per Sec 8. Sent from Outlook for Android From:  venkateswara reddy Desireddy <dvreddy82@gmail.com> Sent:  Wednesday, December 31, 2025 5:52:24 pm To:  materials-welding@googlegroups.com <materials-welding@googlegroups.com> Subject:  Re: [MW:35939] PWHT for Piping weld joint | heating & cooling rate Chart is ok. It's meeting code. One more clause, in 4.5meter long , more than 40°c temperature variations also not acceptable. Sent from Outlook for Android From:  materials-welding@googlegroups.com <materials-welding@googlegroups.com> on behalf of Srinivas Gundala <srinivasrao.gundala@gmail.com> Sent:  Wednesday, December 31, 2025 4:56:22 PM To:  materials-welding@googlegroups.com <materials-welding@googlegroups.com> Sub...

Dear Sirs, As per ASME B31.3 clause no.341.3.1(a) mentioned P Nos.3,4,5A,5B,5C AND 15 materials examination(RT/UT) shall be performed after completion of heat treatment. But no information for P1 material whether NDT performed before or after PWHT. Please advise can we perform NDT(RT/UT) before PWHT activity for P1(NACE/H2 service) material or not. Regards, Ranajit Chatterjee 9995018265 -- 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 visit https://groups.google.com/d/msgid/materials-welding/1766993169.S.607.21315.f5mail-224-227.rediffmail.com.1766993764.7778%40webmail.rediffmail.com .

Hi, For H2 service you have to NDT RT/UT after PWHT. Better to do hardens also. On Mon, 29 Dec 2025, 10:39 am 'ranajit chatterjee' via Materials & Welding, < materials-welding@googlegroups.com > wrote: Dear Sirs, As per ASME B31.3 clause no.341.3.1(a) mentioned P Nos.3,4,5A,5B,5C AND 15 materials examination(RT/UT) shall be performed after completion of heat treatment. But no information for P1 material whether NDT performed before or after PWHT. Please advise can we perform NDT(RT/UT) before PWHT activity for P1(NACE/H2 service) material or not. Regards, Ranajit Chatterjee 9995018265 -- 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 dis...

Just to share. As per ASME B31.3, PWHT is not mandatory for P! material provided certain conditions are fulfilled and not considered a service requirement. If it is a service requirement it is preferable to perform UT before PWHT & RT after PWHT since repair welds need PWHT if PWHT is a service requirement.. If it is ASME Sec.VIII Div.I, for P1 material as per UCS-56 Repairs are permitted after PWHT. Snap shot below. Thanks & Regards J.Gerald Jayakumar 0091-8838619635 On Monday, 29 December 2025 at 01:09:24 pm IST, 'ranajit chatterjee' via Materials & Welding <materials-welding@googlegroups.com> wrote: Dear Sirs, As per ASME B31.3 clause no.341.3.1(a) mentioned P Nos.3,4,5A,5B,5C AND 15 materials examination(RT/UT) shall be performed...