[MW:9667] RE: 9662] Re: Weld Repair on PTFE lined vessel

Dear Sir
Please note my point wise reply as below:-
1. You are right the melting point for PTFE is 330 degree C.
2. The WPS/PQR used is in line with ASME Section - IX.
3. Photograph again attached.
4. Please provide more details on Heat Tint method.

Please also see the following procedure coming to my mind for this repairing
1. We will fill the complete level gauge with cool water and close all
the entry points so that water remain inside during welding.
2. Carry out the welding using PULSE TIG so that heat input can be
minimise.
3. Welding time should be very small to minimise heat input.
4. Put lot of water immediately after completion of welding.
5. Do the High Voltage test to ensure that PTFE lining is not damaged
during welding.
6. KV for High Voltage Test to be selected as per the original wall
thickness of PTFE lining.
7. Do the Hydro test.
Please see if the above procedure is correct and can be used.
With kind regards,
Vinod Kumar Kataria

-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of ayyappan
Sent: Wednesday, February 02, 2011 12:02 AM
To: Materials & Welding
Subject: [MW:9662] Re: Weld Repair on PTFE lined vessel

Dear Mr. vinod,
can you please give the following details, so that i can able give
some solution.
1. What is the melting point for PTEF used for lining. Normaly PTFE
melting point is 327 deg C and Mecanical degread is 260 Deg c.

2. Do you have the WPS/PQR used by manufacture?

3. In you mail i am not able to see the photograph. if possible pls
send.

4. We can use the Heat-tint mehod for this repairs, with low current,
with some of the backup material used inside the pipe.

On Feb 1, 2:12 am, "Vinod Kataria" <vinod.kata...@blissanand.com>
wrote:
> Dear All,
>
> Please see the attached photo for the undercut and advice if it is
possible
> to repair this on PTEF lined vessel the vessel. The size is 2" NB and wall
> thickness is 2mm with inside PTFE lining of 4mm. We have imported this
> vessel from Germany but during 3rd party inspection it is rejected because
> of this undercut. The working pressure of this vessel is only 3.5 bar and
> its successful withstood a hydro test pressure of 10 bar.
>
> Now I request all the expert to please advice if we can repair this
undercut
> if yes than please provide me some guideline or some procedure to carry
out
> this repairing.
>
> Thanks in advance for your kind help.
>
> With kind regards,
>
> Vinod Kumar Kataria
>
> GM - Operations
>
> Bliss Anand Private Limited,
>
> 92B/93B Sector 5
>
> IMT Manesar,Gurgaon,
>
> National Capital Region Delhi.
>
> India .
>
> Phone : +91-124-4366000 (9 Lines)
>
> Mobile Phone : +91-9560199004
>
> Fax : +91-124-2290884
>
>  PIC 1.jpg
> 1220KViewDownload

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