Monday, August 8, 2011

Re: [MW:12153] PWHT on ASME U Stamped Pressure Vessel with SS316 internals

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

On Mon, Aug 8, 2011 at 12:06 AM, Vijay <k.vijayaraj@gmail.com> wrote:
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


On Sun, Aug 7, 2011 at 10:26 AM, kannayeram gnanapandithan <kgpandithan@gmail.com> wrote:
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

On Wed, Aug 3, 2011 at 10:07 PM, Vijay <k.vijayaraj@gmail.com> wrote:
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

On Wed, Aug 3, 2011 at 6:57 PM, Ramin Kondori <raminkondori@gmail.com> wrote:
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
   



On Wed, Aug 3, 2011 at 2:59 PM, Vijay <k.vijayaraj@gmail.com> wrote:
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

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