SA 516 GR 70- AVOIDANCE OF PWHT - 40 mm thickness

[Vishwas Keskar Welding Manager WELDING]

The vessel details are 

MOC - SA 516 GR 70 

DIAMETER- 4020mm

LENGTH - 37 MTR

MDMT = - 50 Deg C to  + 250 Deg C 

SERVICE - Non lethal /No Hydrogen Service 

We are proposing Vessel length build up as per FURNACE LENGTH CAPACITY(24 m maximum) and one joint WITHOUT PWHT  ( JOINING PWHTed sections earlier at site )

Proposal - 

1.MOC - SA 516 GR 70 

2.BUTTERING - ENiCrFe2 on 24 m section end and other at 13 m section end)

3,PWHT (section PWHT - One of 24  length and other 13 m)
 of  - 620 Deg C - 125 MINUTES 

4.Bevel preparation 

5.NDT - DPT 

Welding at site ( 24 m section with 13 m section) - ENiCrFe2 OR E309 

6.NDT - DPT AND UT

Expert opinion please  and share experience if any 

Vishwas 

[pgos...@rogers.com]

Hi Vishwas,

Your query does not indicate the thickness , which is most critical aspect of choosing the PWHT cycle.

Irrespective of that, it’s not advisable to leave one joint, especially the closing joint without PWHT and commission the vessel in service. You may better perform a LOCAL PWHT at the site.

Also using dissimilar consumable is encouraged , only if dissimilar metal welding is involved. In this case use of dissimilar welding consumable is not desired, that may add undue thermal stress in service on the joint welded.

 

Thanks.

 

Pradip Goswami.P.Eng, IWE.

Cell/Whasapp:1-905-9793232

 

From: james gerald <gerr...@yahoo.com>
Sent: October 29, 2021 6:46 AM
To: material...@googlegroups.com
Subject: Re: [MW:32577] SA 516 GR 70- AVOIDANCE OF PWHT - 40 mm thickness

 

Please experts to share on Designer's view with respect to different lateral expansion though Design temperature is +250degC

 

Thanks & Regards

J.Gerald Jayakumar

 

 

 

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[pgoswami]

Sec VIII,Div1:-

40 mm thickness calls for PWHT irrespective of service,  lethal or Non- Lethal. 

Would like to see in  DIV1,which code clause or code case,  allows application of buttering on C.S, PWHT of individual sections, welding of the closing seam by austenitic filler metal with no PWHT.

Thanks. 

P.Goswami. 

Sent from my Bell Samsung device over Canada's largest network.

[Vishwas Keskar]

Sir ,

its 40 mm thickness shell.

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[james gerald]

Please experts to share on Designer's view with respect to different lateral expansion though Design temperature is +250degC

Thanks & Regards

J.Gerald Jayakumar

On Friday, 29 October, 2021, 11:53:02 am GMT+4, Vishwas Keskar Welding Manager WELDING <vvkes...@gmail.com> wrote:

[Ramon Briceno]

Dear Vishwas, 

If you want avoid the PWHT localized and  the impact test, review the engineering specification for this vessel, what is required, the qualified WPS, type of process and electrodes used. 

if you buttering with ENiCrFe2 and finish  with E-309, you are creating a dissimilar weld on the vessel. Does the qualified WPS authorize it? 

Regards, 

Ramon Briceño

www.linkedin.com/in/ramonbriceno-metalengineer

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De: material...@googlegroups.com <material...@googlegroups.com> en nombre de Vishwas Keskar Welding Manager WELDING <vvkes...@gmail.com>
Enviado: viernes, 29 de octubre de 2021 3:47 a. m.
Para: Materials & Welding <material...@googlegroups.com>
Asunto: [MW:32577] SA 516 GR 70- AVOIDANCE OF PWHT - 40 mm thickness

 

[james gerald]

Since your furnace length is 24meters, you have the option to pWHT the entire vessel as provided in the code below with minimum overlap. First PWHT one end for 24meters and then PWHT the another end by reversing with required overlap

Thanks & Regards

J.Gerald Jayakumar

[james gerald]

Normally the use of Nickel electrodes to avoid PWHT was practised in the SR(self reinforced) Nozzles where the vessel is not PWHTed and the Nozzle weld requires PWHT. Experts can throw some light on the C seam and any code restrictions.

Thanks & Regards

J.Gerald Jayakumar

On Friday, 29 October, 2021, 11:53:02 am GMT+4, Vishwas Keskar Welding Manager WELDING <vvkes...@gmail.com> wrote:

[Vishwas Keskar]

Thanks for Sir.

Pl help for ref for Code or Code case.

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[Prasad Ghanekar]

Sir,

1. In this case buttering is carried out prior to PWHT

2. PWHT is due to thickness of P1 material

3. No welding involved with P1 material in closing joint

4. PWHT is not mandatory for P8 welds.

That's my analysis and understanding.

We have implemented such practice in past due to some construction constraints.

Regards,

Prasad G.

On Fri, 29 Oct 2021, 21:40 pgoswami, <pgos...@rogers.com> wrote:

[Prasad Ghanekar]

In my opinion As per ASME code, acceptable, no PWHT required for given condition if welded with austenitic stainless Steel consumables.

However check service condition for dissimilar metal exposure to service fluid and environment.

Regards,

Prasad G.

On Fri, 29 Oct 2021, 18:03 , <pgos...@rogers.com> wrote:

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[Vishwas Keskar]

Dear Prasad 

Thanks for technical support.

Pl share where this was deployed.

Our vessel is ASME SEX VIII DIV 1 vessel

U stamping and TPI is involved.

Any Code back up , Code case  will be further helpful .

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[Prasad Ghanekar]

Refer attached interpretations

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