Requirement of PWHT in categorie D

[g.venka...@gmail.com]

Dear experts,
we are doing welding in a vessel of joint nozzle to dish with reinforcement pad(pipe thick 10mm(32inch), dish thik 20mm & RF pad 20mm) the weld detail in drawing shows bevel(55 degree) followed with fillet(10mm). All are P1 material.
In my question : the total weld metal deposit is 50mm in a joint(40mm CJP & 10 Fillet)
code says above 38mm groove weld for P1 material PWHT is mandatory and also says groove & fillet exceed 26mm in 2inch pipe PWHT is required.
Now we will do PWHT or not in a particular joint. If not kindly tell the reason.
Regards
venkat
welding engineer
trichy.

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Sent from my Nokia phone

[g.venka...@gmail.com]

Dear sir.
Kindly replay the below mail
regards
venkat

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Sent from my Nokia phone

[Jatin Patel]

Dear Venkat
As per ASME Sec VIII Div-1 UCS-56 Notes-2(C)you can preheat to a minimum
temperature of 200Degree F(95degC)is applied and weld both nozzle if have
WPS is available. If you can applied preheat you can avoid PWHT for both
nozzle.
With regards,
Jatin

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[nithind...@gmail.com]

Dear Venkat,

Code doesn't say that this type of joint needs to be heat treated.

Sent from my iPhone

[Prakash Hegde]

Hi! My interpretation is as Weld metal th is more than 38mm (Base meta +RF pad) which is continuous thk Therefore It require PWHT ( However some of the Designer  do not consider RF pad weld thk in calulating effective thk in such case you may not require PWHT) My interpretation is PWHT is required for your case Regards Hegde P.B. --- On Fri, 26/10/12, g.venka...@gmail.com <g.venka...@gmail.com> wrote:

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[Ashpak Savanur]

I think that 38mm is for thk of base material

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[Rems Okonkwo]

Trichy,

 

PWHT will not be required, the reference thickness consider during the design calculation of the vessel is 20mm, the RF pad is only an attachement.

 

regards,

 

Rems

[Sanjay Yadav]

PWHT is not required in your case as base metal thickness is only 20mm.

[kannayeram gnanapandithan]

Yes require
Pandithan