PWHT on ASME U Stamped Pressure Vessel with SS316 internals

[Vijay]

Dear Experts,

We are in big trouble. We need your inputs for our problem which we
are facing now.

We are fabrication a pressure vessel with ASME U stamp. In that vessel
some internal of SS316 materials are to be welded. The size is 24".

My question: Can we do PWHT of Loading Temp @425 Deg. C and Soaking
Temp @610-630 Deg.C of 51 mins Soaking time.

Is there any code requirements for PWHT for SS internals???

We got approval from Client design team PWHT with internals and we
proceeded the welding also based on their confirmation.

Now, our QC is not accepted this method. We are in deep trouble.

Kindly clarify.

Thanks in advance.

Regards,
Vijay

[Karthik]

Hi, Is it a cladding lining? or internal parts attached to inside of the equipment?   If it is like a cladding internal,pls.refer section UCL of Section VIII,div.1.,it clearly specified that the heat treatment shall be done together with the SS or any cladding.   if it is a internal parts to be welded inside,you can weld a pad plate with the same vessel material and go for the PWHT. After PWHT finished you can weld the ss316 parts with the pad plate as welded.   Finally, If your customer accepts to proceed the PWHT with SS316 internal,you can go ahead.Normally customer/Project specification over rules all as they are the end user.I think your QC worried about the SS316 chemical properties after PWHT(corrosion resistant). this can be avoid by doing pickling and passivation after PWHT. Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Wed, 8/3/11, Vijay <k.vij...@gmail.com> wrote:

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[budi.wi...@profab-group.com]

Vijay,
We do all the time in our shop eventhough ASME VIII-1 does not required SS 316 (P8) to be PWHT. However you need to have WPS covering welding P8 to P8 and P8 to P1(assumming vessel material is P1) with PWHT.
Budi Witjaksono

-----Original Message-----
From: Vijay <k.vij...@gmail.com>
Sender: material...@googlegroups.com
Date: Wed, 3 Aug 2011 04:29:41
To: Materials & Welding<material...@googlegroups.com>
Reply-To: material...@googlegroups.com
Subject: [MW:12085] PWHT on ASME U Stamped Pressure Vessel with SS316 internals

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[Ramin Kondori]

Dear Vijay:

• Remove internals,
• weld an internal ring (same material as the shell) to the vessel (later you will weld internals to this ring),
• carry out PWHT on vessel without internals and then
• weld the internals to that internal ring...

This way, after PWHT, there has been no weld on shell (un-heat treated welds are on internal rings).

Good luck

Ramin  Kondori

   QC/Welding Engineer 

         IWE AT 0070

   

[Vijay]

Dear Sirs,

Thanks for your inputs,

@Karthik: It is not having cladding. Yes, your are right they are worried about the chemical properties after PWHT. And it is 24" SCH80 Vessel, after PWHT again doing welding and again PWHT will be a time consuming job. So we have done the welding without any pads inside. This is our current situation.

@Budi: I will rise this point to our QC and let me check what further we can do.

@Ramin: For one vessel we have welded an internal and we carried out welding before PWHT. Now again cutting and removing is a difficult Task.

Thanks & Regards,

Vijay

[Dindo]

We have welded several vessels with the same thing. as long as you have a WPS covering your welding (i.e. P1 to P8 Stress Relieved) then you're OK.. Is it you in-house QC rejecting it? He probably should know your procedure before he joined your company as an inspector or he might not even know anything at all.

[Karthik]

Hi, I think you misunderstood. 1. Weld pad plate with same material(same P.No.) to the shell/Pipe ( if your internals cover full of the inside of the sheel it may be of ring type or weld pad plate where internal are to be there) (WPS P1 to P1) 2. Proceed PWHT without SS316 internals. 3.After PWHT, weld SS316 internals to the Pad palte or ring as you welded with the shell/pipe before PWHT (WPS for P1 to P8) Conduct NDE as applicable. No need to do PWHT again,because you have not welded any direct to the shell after PWHT.

Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Wed, 8/3/11, Vijay <k.vij...@gmail.com> wrote:

[kannayeram gnanapandithan]

You should have simulated WPS. If SS is directly welded to CS and gone for PWHT, u should have used Inconel 182 electrode otherwise if u have used  Austenitic SS electrode then Weld metal might have exprienced embrittlement/sigma phase. pl check

Pandithan

[Vijay]

Dear All,

Thanks for your inputs. Herewith the photos of Vessel with internals attached for your ideas. We already finished welding on SS to CS. This is the problem we facing now.

Thanks,

Vijay

[Arunachalam A]

Vijay,

First of all, please answer the following:

Is your WPS/PQRs used for this vessel are qualified with PWHT at 610 Deg C for the following material combinations:

1. P1 to P1

2. P8 to P8

3. P1 to P8.

If your WPS/PQRs are not qualified with PWHT, then you have a problem.

Arunachalam.A

[Karthik]

Mr.Vijay, As Mr.Arunachalam said,If you have a suitable WPS with PWHT then you can proceed to PWHT with SS internal and after that you can do pickling on SS316 parts.You can convince your QC person that your customer also accepts to do PWHT with SS internals. Finally we shall follow customer's requirement/specification unless otherwise if there is any big conflict to the CODE requirements.In your case its not.you can go ahead.

Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282

--- On Mon, 8/8/11, Arunachalam A <arun...@gmail.com> wrote:

From: Arunachalam A <arun...@gmail.com> Subject: Re: [MW:12153] PWHT on ASME U Stamped Pressure Vessel with SS316 internals To: material...@googlegroups.com