RE: PWHT Segment Wise for 9 Meter Dia Vessel

[pgos...@rogers.com]

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:pgos...@rogers.com,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

 

UW-40 PROCEDURES FOR POSTWELD HEAT TREATMENT:

From: vishal hirde <vishalh...@gmail.com>
Sent: June 25, 2022 8:24 AM
To: material...@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. 

 

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With Best Regards,

Vishal Hirde

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[Raghuram Bathula]

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

[vishal hirde]

[james gerald]

What diameter can your furnace accommodate?. 9 Meter seems to be Big.

There are some options if your Furnace cannot accommodate.

1.  Try for a Temporary furnace with proper insulation and Heating arrangements. Hope there are some subcontractors available.

2. Try for LOCAL PWHT of the seams.

3. Below option may be useful if you have difficulty accommodating the Length in one Heat.

Thanks & Regards

J.Gerald Jayakumar

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[Vishwas Keskar]

Dear Vishal 

As I understand  correctly , the vessel circumference is 9 mtr  and  your query is that you want to carry out the PWHT of the Circumferemtial seam in segments.

The answer is No . You have to carry out PWHT  of  ENTIRE Circumferencial joint in ONE cycle.

You can do it by LOCAL PWHT method by wrapping Electric Resitance Coil on job and attaching job thermocouples.

Many HT contracter are doing such type jobs regularly.

Thanks 

Vishwas Keskar 

IWE- International Welding Enginner

[ViNo Varughese]

Dear Experts and Goswami Sir,

The most technical preferred method is definitely the full furnace PWHT, no doubt in it. However, there are situation where localized PWHT has to be performed is unavoidable. An example is the Pressure Vessels which are in service vessels and the process demands PWHT. I don't have much confidence in temper bead technique.

Thanks and regards

Vino Varghese

Qatar

[james gerald]

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

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[james gerald]

Dear Raghuram,

Please any code case or Interpretation.

Thanks & Regards

J.Gerald Jayakumar

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

[james gerald]

Straight to the point Mr. Vishwas.

Thanks & Regards

J.Gerald Jayakumar

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[vishal hirde]

Thank You Experts for Valuable Comments.

As per discussion in trailing mail, Conclusion: as per Code localized PWHT Segment Wise using Induction Coil Heating Method can be considered for this Job.

Regards,

VH

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With Best Regards,

Vishal Hirde

Inspection Engineer
Velosi Certification Services (I) Pvt Ltd

[Raghuram Bathula]

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".

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