Re: [MW:33190] RE: PWHT Segment Wise for 9 Meter Dia Vessel

Dear Jayakumar

Not exactly. UW 4-(a)(8) covers everything else. As i mentioned it is not a preferable/recommended method (either go with Modular or Internal firing are most appropriate). 

"provided that other measures (based upon sufficiently similar, documented experience or evaluation) are taken that consider the effect of thermal gradients,

all significant structural discontinuities (such as nozzles, attachments, head to shell junctures), and any mechanical loads which may be present during PWHT.

The portion of the vessel or component outside the soak band shall be protected so that the temperature gradient is not harmful".

On Sun, 26 Jun 2022 at 11:55, 'james gerald' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Dear Raghuram,

Just for knowledge purpose. Do ASME Sec.VIII Div.I the applicable code permit LOCAL PWHT of Longitudinal seams.

Thanks & Regards

J.Gerald Jayakumar

On Sunday, 26 June, 2022 at 07:46:29 am GMT+4, Raghuram Bathula <raghurambathula@gmail.com> wrote:

Although no restriction in code preferable methoud could custom build modular furnace (with panel construction) at site

It is straight forward method for cir seams, however for long seams you have to work a methodology for placing coils locally using WRC 452 guidelines, probably  supplimented with an FEA to check thermal stresses

On Sat, Jun 25, 2022, 8:21 PM <pgoswami@rogers.com> wrote:

Hi,

It's allowed by Sec VIII, DIV1. Please see the highlighted clauses as below.

Thanks.

 

Pradip Goswami.P.Eng, IWE.

Independent Welding & Metallurgical Engineering Specialist

Saudi Aramco Approved Designated Project Welding Engineer (DPWR)

Qatar Petroleum Approved, SME-Materials & Corrosion Engineering.

Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/

Email:pgoswami@rogers.com,pradip.goswami@gmail.com

Cell/Whasapp:1-905-9793232

 

UW-40 PROCEDURES FOR POSTWELD HEAT TREATMENT:

From: vishal hirde <vishalhirde1988@gmail.com>
Sent: June 25, 2022 8:24 AM
To: materials-welding@googlegroups.com
Subject: PWHT Segment Wise for 9 Meter Dia Vessel

 

Dear All,

 

We are fabricating a Vessel of Diameter 9 Meter at Site, requires PWHT: Material Grade SA 516 Gr. 70.

 

 For Circumferential Joint PWHT can it be performed Segment Wise as diameter is more??

 

Pl. Confirm as per ASME Sec VIII Div 1 can it be done in Segment Wise. 

 

--

With Best Regards,

Vishal Hirde

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