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: prabhakars84@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 -
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