R-stamp

[Ali Bhatti]

Dear Experts

We have one Vessel to fix baffle plates . Vessel is under service since 9 years. Shell thickness is 38 mm and baffles plates thickness will be 7mm. My question are:
1. Is R-stamp required or not? 2. Is local PWHT required or not?
Please share / send me answer with reference of codes

Thanks and Best Regards

[Prakash Gotimukul]

Yes R stamp required if the welding is on pressure part. PWHT is required if the vessel is originally heat treated. Check the MDR for details. You can check the PWHT process as recommended in NBIC and original code of construction.

The question is incomplete as you have not indicated if the vessel is code stamped and what code was stamped. Also what is th e reason for fixing baffle plates now. If it is a new addition, then the design needs to be revisited too. 

Rgds

Prakash Gotimukul

AIS, Consultant ASME/ISO/PED/IBR

 gpraka...@gmail.com.

 Mob:+97152 979 5678

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[Kristian Lund Jepsen]

Hi,

We had some time ago a similar problem.

To avoid welding and PWHT, we decided to go for gluing brackets on the shell’s innser surface. Baffles were bolted to these brackets.

 

A detailed design of the brackets and surfaces to be glued was made. A specialist company working to qualified gluing procedures was hired (they also gave inputs to the design of the brackets) and full QC was present during the process.

Similar to use of gluing in aero space. Industrial gluing is not for everybody; it is an expert area.

 

It has now been working without problems for about 3 years.

 

regards

Kristian

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Prakash Gotimukul
Sent: 2. januar 2017 04:20
To: materials-welding
Subject: Re: [MW:25861] R-stamp

 

Yes R stamp required if the welding is on pressure part. PWHT is required if the vessel is originally heat treated. Check the MDR for details. You can check the PWHT process as recommended in NBIC and original code of construction.

The question is incomplete as you have not indicated if the vessel is code stamped and what code was stamped. Also what is th e reason for fixing baffle plates now. If it is a new addition, then the design needs to be revisited too. 

Rgds

Prakash Gotimukul

AIS, Consultant ASME/ISO/PED/IBR

 gpraka...@gmail.com.

 Mob:+97152 979 5678

 

On Mon, Jan 2, 2017 at 12:29 AM, 'Ali Bhatti' via Materials & Welding <material...@googlegroups.com> wrote:

Dear Experts

We have one  Vessel   to fix baffle plates . Vessel is under service since 9 years. Shell thickness is 38 mm and baffles plates thickness will be 7mm. My question are:
1. Is R-stamp required or not?  2. Is local PWHT required or not?
Please share / send me answer with reference of codes

Thanks and Best Regards

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[dilintas]

If it is in a jurisdiction which requires Road stamp, then yes. The addition of baffles could be considered as a minor alteration since the pressure boundary is not altered 

Sent from my Samsung Galaxy smartphone.

[Charley Sui]

Hey Ali,

You might want to check "ASME PCC-2 Repair of Pressure Equipment and Piping".  

Alternatives In lieu of PWHT might apply in your case.

Good luck

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