Dear Sir,
Thank you for your explanation.
As the vessel design based on Sec VIII Div-1, and if our client insists to do PWHT for that joint,
Case 1) can we do a pqr by buttering with ERNiCr-3 on P No.5A plate and butt weld with same filler for this dissimilar joint to avoid pwht.
Because, for P no.1 , the holding temperature is about 600 deg C and for P No.5A, the holding temperature is about 675 degrees C as per Sec VIII Div1,.
Case 2) Or , when we do pwht for this joint using ER80S-B2 filler, can we use higher holding temperature of 675 degree C .
METALLURGICALLY, is it safe ?
Please confirm.
Thanks and Regards,
Saravanan Sornam,
S.KOREA
in case the nominal base metal thickness is less than 16 mm and the specified Cr% is less than 3 (you must check the base metal MTRs) and the max C% is 0,15 (check MTR) and you apply a min preheat of 150degC then you are allowed not to perform PWHT, as per Section I
Δρ. Γεώργιος Διλιντάς
Αεροναυπηγος Μηχανικός - Μελος ΤΕΕ 55018
Τηλ +30 210 8100578, +30 6944 646 204
Dr. Georgios Dilintas,
Dipl. Ing. In Aeronautic and Space Engineering
Ph.D in Mechanics of Solids - Computational Mechanics
A.I.S, A.N.I, Lead Auditor
Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis
Dear Sir,
It is a condensate receiver tank and it is a design requirement from client side.
Regards,
Saravanan.
S.KOREA
Why do you use P22 nozzles on CS?
Dear Sirs ,
We have a project with both shell and Reinforcement Pad materials SA516-70, 10 mm Thk ( P No.1 ) and the Nozzle is SA335-P22, 4" Sch 120 ,
11.1 mm ( P No.5A ) Thk.
We already have a qualified WPS & PQR with 8mm GTAW and tested about 10 years ago by other welding engineer, for P No,.5A to P No.1 without PWHT and it was satisfactorily passed and we
have used that WPS & PQR for the previous project 10 years ago and no
issues found without PWHT.
Now for the new project, we are going to use the same WPS and apply
Preheat ( 204 to 250 Deg C ) as per the WPS for 10mm Shell Thk by
multipass welding, refer to the below sketches.
So, i would like to confirm whether PWHT is mandatory as per UCS-56-4 ?
Can we avoid PWHT for this 10mm weld joint ?
Or Should we do buttering with ERNiCr-3 on P No.5A bevel and butt weld
with same filler for this dissimilar joint to avoid PWHT after making new
PQR with buttering?
Please confirm soon.
Thanks and Regards,
Saravanan Sornam,
ANSAN-Si,
S.Korea
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