minimum distance limitation between two weld joints

[murat aksoy]

Hello my friends,

I have a problem.

Is there minimum distance limitation between two weld joints as per ASME B31.3. or EN

thanks

[Deepak Ingale]

if we r using normal  formula is thk x 4

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[Dinesh Somwanshi]

geneally we are 2.5 x dia

On Tue, Mar 6, 2012 at 5:30 PM, murat aksoy <maks...@gmail.com> wrote:

[madhan chozhan]

Hi 

the minimum spacing between two welds shall be 1.5 times the pipe OD or 5 times the pipe wall thickness whichever is greater.

regards,

madhan

On Tue, Mar 6, 2012 at 5:30 PM, murat aksoy <maks...@gmail.com> wrote:

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Thanks & Regards

Srirammadhan

Piping/painting inspector

Great drill Chaaya

Great Ship

Hamriyah Free zone, UAE

+971-509846269

[mazlan abd aziz]

Dear Murat,
Refer to your project specification its shall be mention some where,
but from my experience it shall be away from the heat effected zone of
the weld to avoid chance of metallurgical properties and best practice
is 2 x thickness of the base metal.
Correct me if I am wrong

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Best Regards

Mazlan Abd Aziz
Freelance Inspector
Email: mazlan...@gmail.com
maz...@yahoo.com
Mobile:+6019-4772079

[ASIM MUNIR]

I do agree with Mr.  mazlan abd aziz HAZ should not be collapse code is silent in this regard.

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Regards,
 ASIM

[pradip kumar sil]

Dear,
There is no hard & fast rule in ASME code. You just follow your
project specification.
Regards
Pradip

[Ramin Kondori]

Dear Murat:

If you apply PWHT on one (or both) of the welds it will make
things less critical.

One of the most important issues of adjacent welds is that the residual stresses resulted from each weld will be compiled to exceed the maximum allowable stress in the pipe so by any means you should reduce these residual stresses.

Stress relieving of both welds will be the best solution and you can do that in one PWHT operation.

Regards
Ramin Kondori
Deputy QA/QC Manager
IRAN-LNG Project
NARDIS Energy Co.

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[Ramesh Barot]

Dear Marut,

 

As per my experience this is not one line answer, but there are different types of conditiotions:

 

1) If two CS butt welds then min 50 mm or 6t.

2) If two LS butt welds then 10t or 150 mm whichever is small.

3) If two fillet welds are there and they are of presser line i.e. pipe joint then condition 1 shall be applied. 

4) Two fillet welds but not direct affecting presser as per condition no.3 then 2t or 40 mm whichever is max.

 

Hope that it clear , 

 

Dear Experts please correct me if I am wrong. 

 

Thanks,
With Best Regards,
Ramesh Barot

From: mazlan abd aziz <mazlan...@gmail.com>
To: material...@googlegroups.com
Sent: Tuesday, March 6, 2012 7:44 PM
Subject: Re: [MW:13846] minimum distance limitation between two weld joints

Dear Murat,
Refer to your project specification its shall be mention some where,
but from my experience it shall be away from the heat effected zone of
the weld to avoid chance of metallurgical properties and best practice
is 2 x thickness of the base metal.
Correct me if I am wrong

On 3/6/12, murat aksoy <maks...@gmail.com> wrote:
> Hello my friends,
>
> I have a problem.
>
> Is there minimum distance limitation between two weld joints as per ASME
> B31.3. or EN
>
> thanks
>
> --
> To post to this group, send email to material...@googlegroups.com
> To unsubscribe from this group, send email to

> materials-welding+unsub...@googlegroups.com

> For more options, visit this group's bolg at
> http://materials-welding.blogspot.com/
> 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.
>


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Best Regards

Mazlan Abd Aziz
Freelance Inspector
Email: mazlan...@gmail.com
          maz...@yahoo.com
Mobile:+6019-4772079

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[Veereswara Rao]

Hi Mr. Srirammadhan,

May I know the reference for the 1.5 times the outer dia as the minimum distance.

Regards,

Veereswara Rao Yeluguri.

[Kannayeram Gnanapandithan]

Ref BS EN 12952-5

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[Mustafa Al-Zeir]

I think that the minimum distance is to weld 3 times of thermal effective zone of first weld

  

2018-04-17 12:36 GMT+02:00 Kannayeram Gnanapandithan <kgpan...@gmail.com>:

Ref BS EN 12952-5

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[Castle73]

Friends a warm greeting to the whole group.

I have seen different publications regarding the minimum distance between welds, in this forum regarding this debate.

Of all the comments, the one that I find most convincing is the one expressed by comrade Srirammadhan in March of 2012, which says that it must be 1.5 times the outside diameter of the pipe or 5 times the thickness of the base metal or pipe, the greater of both values.

Then the friend Veereswara Rao on April 17, 2018, asks if there is a norm of reference in this respect, in fact according to the response of the friend kannayeram gnanapandithan if there is reference to a norm that supports it (Ref BS EN 12952-5), what which I think is excellent, because it must be that way, because each criterion or rule must be backed by a rule in a certain code that is being used. In the debate that opened the friend Murat Aksoy in March 2012 I consulted for the code ASME B31.3 or EN.

Now, this same criterion quoted from the reference Ref BS EN 12952-5, can be used for ASME B31.3 ??? or can it even be used for ASME B31.8 ????

In our case we use as a criterion that the minimum distance between two welds is 1 time the outer diameter of the pipe or base metal or 12 times the thickness of the same, the greater of both values, this as best practice, but the weakness of this criterion is that it lacks support, that is, it has the weakness that it does not have or at least does not achieve an endorsement in a Standard, either in ASME Code B31.3 or B31.8.

It is for this reason that I consider Comrade Srirammadhan's comment to be strong because it has a basis and support. I also respect all the comments of the participants of this debate in the forum. But like the criterion that I stated, any criterion without endorsement of reference to norm becomes only a best practice.

I apologize if I do not know that the rest of the comments on the subject also have reference to some standard as a backup in a certain code that is being used.

Please comment and also clarify what criteria can be used for ASME B31.8.

regards
Castle

[Kannayeram Gnanapandithan]

Nowadays most of requirements are applicable in ASME and ISO also.

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  AWS-CWI, CSWIP 3.1,

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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[Jaydeep]

Dear,

Please refer DIN EN 13480-4_2012-11, Clause 8.1

Longitudinal weld seam in adjoining components shall be staggered by twice the nominal wall thickness, with a minimum distance of 20 mm.

Thank you!!
Jaydeep Limbasiya
QA QC Engineer

[Kannayeram Gnanapandithan]

In ASME , 5Xthickness for shell course

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