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[MW:537] Re: 533] Filler metal for P 11 (O/L SS 347) to P8

By Materials & Welding
This is a typically rare case. You may follow as follows:

1) Buttering on P-11 material by inconnel (ENiCrFe-3 is the most
economical). Minimum thickness should be 4.8 mm.
2) PWHT of the buttering. (Local PWHT is desirable if whole bonnet is not
subject PWHT)
3) Welding of LWN nozzle (I suppose it will be set-on type) onto the
buttering. (Be careful not to touch the base metal P-11 during the final
welding)

If it is not practicable or if process/project specifications allow
indexcriminate PWHT of the SS 321 material, you may avoid buttering (step-2
above)

By the way, what is the design temperature for the Tube-side? (There is
also a restriction in code for inconnel filler.)

Best regards,

Prasad Joshi
e-mail: pjoshi@technip.com
Phone: +971-(0)2-611-6643



gopal sankar
<gopalsankar@yaho
o.com> To
Sent by: materials-welding@googlegroups.com
materials-welding cc
@googlegroups.com
Subject
[MW:536] Re: 533] Filler metal for
30/01/08 07:10 AM P 11 (O/L SS 347) to P8


Please respond to
materials-welding
@googlegroups.com


In the above query the thickness of weld neck & nozzle has not been
mentioned and assume that the connection is between the nozzle pipe & weld
neck flange.If there is no PWHT as per design requirements then root as
well as final pass welding can be carried out using ER347 +E347 due to
homogeneuous layer present. Welding final layer with Inconel will not give
have any positive impact rather the chance pf cracking is not ruled out due
to differential thermal expansion of P11+SS347+Inconel.Either full welding
with 347 or Inconel will be a better option.

with regards,
gopalsanakr
DM(ES-Inspn)
CPCL
Chennai

"Bathula Raghuram (Mumbai - PIPING)" <R.Bathula@ticb.com> wrote:
Is this vessel subjected to PWHT?
I assume it should be, also assuming it is a stub in type connection, then
use ER347 + E347 for joining weld overlay portion to LWN (i.e inside weld
of nozzle), and may use Inconel consumables ERNiCr3+ENiCrFe-2/3 for weld
on ouside (i.e fillet joining P11 to F321 neck)

From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Desai Jignesh
Sent: Tuesday, January 29, 2008 2:46 PM
To: materials-welding@googlegroups.com
Subject: [MW:533] Filler metal for P 11 (O/L SS 347) to P8

Dear Member,

Can some body give his/her opinion for filler metal of following
condition?

Branch connection (Tube Side) between LWN flange (Material SA 182 F321) to
SR Nozzle (SA 182 F11 CL 2 + Weld Deposit 347 SS).

Service is Hydrogen.

Operating Wall Temperature - Tube Side is IN 372 C & Out 225 C.

Also recommend the filler metal for the first layer of weld deposite.

Thanks in advance

Jignesh

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