Minimum distance between butt weld joint and support weld

[ratna sekhar]

Dear experts,

Can any one please confirm the Minimum distance between butt weld joint and support weld.

And where that data will be available.

Regards,

[murugesan jeyaraman]

Hi

 

ASME sec VIII Div 1, UW-14 allows even opening to pass through weld seams, If weld seam is radiographed. We can interpret that  Nozzle neck can pass though weld seams, any welds can be located close to weld seams and reinforcement pad can overlap the weld seams. So we can also interpret that non pressure attachments can be welded close to weld  seams or overlap weld seams provided RT is done on weld seams.

 

If RT is not done, weld distance shall be maintained 13mm.

 

Most of Client specs states that Minimum weld distance of 50 mm shall be maintained between welds. In this case, if it is not possible to maintain 50mm of weld distance,

 

We can propose to client to do NDT like (1) RT and MPI/DP for Butt welds (2) UT and MPI/DP for attachment fillet welds and affected HAZ between welds  (3) Hardness of affected HAZ. (Depends on criticality of welds, materials, and cost impact)

 

Some client spec requires PWHT for Carbon steels  in case this weld distance not maintained.

 

Thanks

 

Murugesan

 

 

 

 

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[Biplab Pal]

Please go through your construction code or client specification.

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Thanks & Regards

Biplab Pal
Industrial Services, Inspection Engineer.
SGS India Pvt. Ltd.
Kolkata Branch

E-mail:   bipla...@gmail.com
 
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[Manoharan Kalimuthu]

Dear Raj,
Maintain 50 mm (or) 4 times the pipe wall thick
which ever is less.
there is no data in the code reg this.
Regards
Mano

2011/7/31, ratna sekhar <badd...@yahoo.co.in>:

[Fitria Rahman]

i would like to suggest you to read far enough the engineering/technical document. the thing you need might be there, as the ASME B31 code does not list the limit.

The thing you need is to avoid HAZ and stress concentration effect on material. this may be a 1 inch distance for thin material or 4 inches distance for great thickness material.

just to let you know that some document specifies four times from the thickness of pipe, but other document specifies 5 times.

Rgds 

2011/8/1 ratna sekhar <badd...@yahoo.co.in>

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[Binoy Soman]

usually, it is 3 times the thickness of  the base metal. U please check ur procedure- welding of pipelines

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From: ratna sekhar <badd...@yahoo.co.in>
To: "material...@googlegroups.com" <material...@googlegroups.com>
Sent: Sunday, July 31, 2011 9:30 PM
Subject: [MW:12016] Minimum distance between butt weld joint and support weld

[Eswaran samikannu]

It depends on code requirement, U using ABS code for shipbuilding you can get details from repair specification.

Go to ABS website & download free

Thanks

Regards

S.Eswaran 

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From: ratna sekhar <badd...@yahoo.co.in>
To: "material...@googlegroups.com" <material...@googlegroups.com>

Sent: Monday, 1 August 2011 2:30 AM
Subject: [MW:12016] Minimum distance between butt weld joint and support weld

[Ramin Kondori]

Stress concentration effect of adjacent welds is the cause of specifying a min distance between welds.

If you keep a certain distance (say 50mm or 4 x pipe thickness) it's not going to be that harmful but if you can not avoid this, you'd better stress relieve one of the welds (pipe but weld is better).

This way there will be no concern at all...!!!

in case of austenitic stainless steel or wherever stress relief is not allowable, just re-locate the support (or pipe weld)

Regards

Ramin  Kondori

   QC/Welding Engineer 

         IWE AT 0070

   

[limesh M]

Dear Mr. Ratna sekhar,


As per AS 4458 - Pressure equipment manufacture(Australian standard),





Regards,


Limesh