[MW:1064] Re: 985] Re: HAZ

Hi,
I dont think the statement is correct for API 620. It is the code for
Large, welded, low pressure storage tanks and can be of single wall or
double wall construction.
Regards,
R. Bose

On Aug 25, 12:55 pm, francis.l...@indiatimes.com wrote:
> Dear Freinds,
> API 650 is a code for tankages for storage of liquid petroleum Products at atmospheric pressure or very low posetive pressure ( ref Annexure M) whereas API620 is a code for storage tanks for higher pressures and it is having primary shell and secondary shell and primary shell is for the storage of product like ethylene/propylene/ammonia etc with the gap between two shell is filled with insulating material to take care of cryogenic  temperature and more stringent requirements are covered in API 620.
>
> Regarding HAZ , it is not measured by length ,we speak about width of HAZ and noramlly it is not more than 3to 5mm whcih normally you can see when you do a macrosection of weld coupon and this can be reduced by using preheat /temperbead welding or by having chemistry with low CE
>
> Best Regards,
> Francis lobo  
>
>
>
> ----- Original Message -----
> From: prabhakar...@gmail.com
> To: Materials & Welding <materials-welding@googlegroups.com>
> Sent: Sat, 23 Aug 2008 16:16:48 +0530 (IST)
> Subject: [MW:1052] Re: 985] Re: HAZ
>
> Hi,
>
>   I think API 620 is for Cryogenic product storage tanks like LNG etc.
>
> Regards
> Prabhakar. S
>
> On Jul 31, 3:50 pm, "Mahuri Snehkumar \(TIPO - QA/QC\)"
> <S.Mah...@panipat.ticb.com> wrote:
> > Dear Bose,
>
> > The difference what you have mentioned that I am also well aware of, but I require some other major difference.
>
> > Regards,
>
> > Snehkumar L. Mahuri
> > Lead - Welding / NDE
> > EPCC 2A, PANIPAT
> > 9215989508
>
> > -----Original Message-----
> > From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Rituraj Bose
> > Sent: Thursday, July 31, 2008 3:32 PM
> > To: Materials & Welding
> > Subject: [MW:985] Re: HAZ
>
> > Dear Mahuri,
>
> > Actually length of HAZ cannot be specified so easily. In any case you
> > can follow the link to have just an idea for it.
>
> >http://www.esabna.com/us/en/education/knowledge/qa/How-does-welding-a...
>
> > Regarding your 2nd question I can tell that the Code name itself
> > identifiy the difference.
> > API 650 is for the "Welded Steel Tanks for Oil Storage" and API 620 is
> > for the "Design and Construction of Large, Welded, Low-Pressure
> > Storage Tanks".
>
> > Regards,
>
> > R. Bose
>
> > On Jul 29, 7:11 am, "Mahuri Snehkumar \(TIPO - QA/QC\)"
> > <S.Mah...@panipat.ticb.com> wrote:
> > > Dear friends,
>
> > > Can someone tell me the exact length of HAZ area after the weld.
>
> > > Also what is the main difference between API 650 and API 620 codes.
>
> > > Regards,
>
> > > Snehkumar L. Mahuri
>
> > > Lead - Welding / NDE
>
> > > EPCC 2A, PANIPAT
>
> > > 9215989508
>
> > >  image001.gif
> > > 92KViewDownload- Hide quoted text -
>
> > - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

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