[MW:1552] Re: Min Separation of welds

Dear Mr. Mohammed,
 
Sorry for the late answer, but today I had lots of things to take care of.
I have attached the quotation from DVGW which pertains to the distance between two welds. It is in german, so I will paraphrase its meaning:
1. The distance should be enough in order to avoid the mutual negative influence of both welds.  
2. The distance between two circumferencial welds in case of segments and elbows must be not less than 3.5t (t - wall thickness). It should be at least 25 mm between the decorative layers.
 
Of course, the stipulations in this regulation will not be observed in your case and because the minimum distance between two welds is not firmly specified in the standards, you always have to come to some agreement with the client about this. 
 
Regards
P.Chavdarov
 
Цитат от Zameer Mohammed <dreamthinkwork@gmail.com>:

> Dear Mr. Parvan,
>
>
>
> Thanks for your inputs. Kindly scan it and send it across.
>
>
>
> Thank you,
>
>
>
> Regards,
>
>
>
>
>
> Sabir
>
>
> On Wed, Feb 11, 2009 at 12:36 AM, <p_chavdarov@mail.bg> wrote:
>
>> Dear Gentlemen,
>>
>> Let me introduce myself. My name is Parvan Chavdarov and I am working for
>> TUV Cologne as expeditor. I can share with you my experience.
>>
>> In general this minimum distance is not specified in the most commonly used
>> regulations, like ASME. Even here in Germany there is no special
>> requirements except in one regulations that refer to water and gas systems
>> (if you are interested I can scan it and send it to you tomorrow, but if I
>> am not mistaken, the distance has to be 4t or 50 mm whichever is bigger).
>> Mr. Raghuram is right that there is something mentioned in EN 13480-3, but
>> this is an exception.
>>
>> You may be sure about one thing - the minimum distance between the welds
>> depends on the thickness of the product in question. The thicker the
>> material is, the bigger the distance should be, because the heat affected
>> zone is bigger.
>>
>> Best regards
>> Parvan Chavdarov
>>
>> Цитат от "Bathula Raghuram (Mumbai - PIPING)" <R.Bathula@ticb.com>:
>>
>> > No such requirement in code (B31.3) for min separation, it always from
>> > the client standards or the engineering guidelines issued at the
>> > beginning of the project, one such is attached herewith gives some idea,
>> > which we have used for one of the project in mid 90's.
>> >
>> > 150mm as given below by Mr Nilesh for circumferential welds is normal
>> > engineering practice (I think Aramco or UOP standards specify similar
>> > requirement) followed by most of the pipe fabricators.
>> >
>> > As far as I know PFI ES7 gives min spacing for welded nozzles.
>> >
>> > EN 13480-3 also give similar requirement for branch welds (refer fig.
>> > 8.4.1-2)
>> >
>> > Members pl. share if any other codes gives such requirement.
>> >
>> >
>> >
>> > ________________________________
>> >
>> > From: materials-welding@googlegroups.com
>> > [mailto:materials-welding@googlegroups.com] On Behalf Of Zameer Mohammed
>> > Sent: Tuesday, February 10, 2009 2:32 PM
>> > To: materials-welding@googlegroups.com
>> > Subject: [MW:1537] Re: minimum length
>> >
>> >
>> >
>> > Dear Mr. Nilesh,
>> >
>> >
>> >
>> > Could you pls give the reference paragraph in the ASME B 31.3 which
>> > mentions this?
>> >
>> >
>> >
>> > I heard it shall be 5t or min 300mm for the size of a pup piece. No
>> > where in the ASME B 31.3 I could see it mentioned. Correct me if I'm
>> > wrong.
>> >
>> >
>> >
>> > Thank you,
>> >
>> >
>> >
>> > Regards,
>> >
>> >
>> >
>> >
>> >
>> > Sabir
>> >
>> >
>> >
>> > On Tue, Feb 10, 2009 at 11:28 AM, nilesh <nilesh_parsekar@yahoo.com>
>> > wrote:
>> >
>> > Dear Javed,
>> >
>> >
>> >
>> >    As per ASME 31.3 it should be 150mm
>> >
>> >  Nilesh Parsekar,
>> >
>> >  QC CO-ORDINATOR
>> >
>> > (Dp Mech,API 510,API 570,AWS-CWI,NDT LEVEL2)
>> >
>> >  Belleli Energy
>> >
>> >  QATAR
>> >
>> >
>> >
>> > --- On Tue, 2/10/09, Mohammad Javeed <mmubasharjaveed@gmail.com> wrote:
>> >
>> > From: Mohammad Javeed <mmubasharjaveed@gmail.com>
>> > Subject: [MW:1534] minimum length
>> > To: materials-welding@googlegroups.com
>> > Date: Tuesday, February 10, 2009, 1:09 AM
>> >
>> >
>> >
>> > dear all, have a nice day
>> >
>> > can any one tell me what is a  minimum length between two butt joints.(
>> > piece of pipe) with reference
>> >
>> > thanks with regards
>> >
>> > m javed
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > Виж това предложение!
>> Регистрация на домейни .EU .TV и .ME, сега на промоционални цени,
>> започващи от 13,75 лв!
>> >
>>
>
> Невероятно предложение!
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