RE: [MW:8281] RE: 8267] PWHT and RT

Dear Sagar,
 
Cracks are also related to termal contraction of high thickness pipe, personally I've seen cracks 48 h after welding and 24 h after RT. I suggest you perform RT before and after PWHT.
RT Before PWHT, because repair a high thickness joint take a lot of time if the defect is not near to the surface, and after repair you have to do PWHT.
RT After PWHT, becasue some times cracks appears after RT and B31.3 indicates so.
 
Regards
 
 
 
> Date: Mon, 15 Nov 2010 12:52:15 +0300
> Subject: Re: [MW:8274] RE: 8267] PWHT and RT
> From: ncp.clt@gmail.com
> To: materials-welding@googlegroups.com
>
> Dear Sagar,
>
> Asper B31.3 2007 Edn...No need of PWHT upto 20 mm thickness.
>
> On 11/15/10, ahmed <ahmed@costaindas.ae> wrote:
> > Hi Sagar,
> >
> >
> >
> > As per ASME31.3, you will find PWHT before RT, But suggestion is to you
> > follow your Project Specification or other wise Construction Code of your
> > project.
> >
> > Same issue came in our project also.
> >
> >
> >
> > Regards,
> >
> > Ahmed
> >
> >
> >
> > _____
> >
> > From: materials-welding@googlegroups.com
> > [mailto:materials-welding@googlegroups.com] On Behalf Of Sagar QC
> > Sent: Monday, November 15, 2010 10:21 AM
> > To: materials-welding@googlegroups.com
> > Subject: [MW:8267] PWHT and RT
> >
> >
> >
> > Hi,
> >
> >
> >
> > I have a doubt regarding PWHT and RT. We are welding P1 Material Pipes which
> > has thickness more than 19mm so we are performing PWHT for the same. But my
> > question is regarding when to take RT? Can we accept the joints which is
> > radiographed before PWHT and MPI after PWHT. Or will we have to perform the
> > RT only after PWHT of the joints? Please advice me regarding this and
> > provide the supporting clause.
> >
> >
> >
> > Thanks and Regards,
> >
> > Sagar.
> >
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> The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.