All of the following require a 1/16 inch minimum gap prior to welding for socket type joints: ASME I, ASME VIII, ASME B31.1, ASME B31.3. None of these Codes address the condition after welding. My familiarity with the Code would indicate that this is intentional as it is generally recognized that the joint often will close completely after welding.
Customer’s can demand anything, whether rational or not. In many cases the customer will assume if there is no gap after welding the socket weld was not properly gapped prior to welding (where were their inspectors during fit-up?) . Physics be damned. No amount of scratch marking etc. will convince these customers. The only way is to gap to greater extent or through the use of gap-o-letsÒ.
Bottom line: read your customer specifications carefully before you begin fabrication.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Pradeep kumar hormis
Sent: Tuesday, September 25, 2012 2:32 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:15386] Re: Socket weld gap requirement
Sir
I would like to know , any criteria for maintaining the GAP between ID of female part and OD of pipe or male part especially in SOCKET joints.. Any standards or specification given details of it?. There was an issue between client inspector and contractor.
On Mon, Sep 24, 2012 at 5:50 PM, John Henning <jhenning@deltak.com> wrote:
The statement in Saudi Aramco Clause C2 is correct.
More often than not, the gap will “disappear” after welding. The common misconception is that you must have the gap after welding. The purpose of the gap is to permit shrinkage of the weld without creating additional mechanical stresses on the finished joint. Obviously, in weldor parlance, if the joint “sucks in” the gap will close.
Note that at one time, the EPRI NDE center was doing some investigation into the necessity of gaping socket joints. The opinion at that time was that the gap was unnecessary and that this “rule of thumb” was a nearly universal myth. If memory serves me correctly, the recommendation was that a more important modification for socket joints was to make the length of the horizontal leg of the weld twice the length of the vertical leg. This type modification was reportedly very effective especially in minimizing fatigue cracking. I wouldn’t mind knowing if this has been investigated further or if there was any additional information published on this.
John A. Henning
Welding & Materials
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Pradeep kumar hormis
Sent: Monday, September 24, 2012 3:14 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:15378] Re: Socket weld gap requirement
Dear All
I would like to introduce my self first. I am working as QC WELDING INSPECTOR for one of SAUDI ARAMCO project. we are using most of socket joints for plant piping . SAUDI ARAMCO having special standards , procedures and check lists for all the cases. so here i attached one of the check list for socket joints fit ups. even it is a client specification , I hope you will get help for your clarification. please note the CLAUSE -C2 on the SAIC.
On Sun, Sep 23, 2012 at 7:20 PM, Hernan Arturo Castillo Mier <Hernan.Castillo@ecopetrol.com.co> wrote:
Your information is not true.
The gap its necessary for thermal expansion of tube been welded according to the operation temperature.
Its necessary to calculate the expansion expected according to the op temp.
Enviado desde mi iPhone
El 23/09/2012, a las 10:28 a.m., "ranendrac6@gmail.com" <ranendrac6@gmail.com> escribió:
> The gap is required to release the fume gases which generated during welding. No gap required after welding(I don't see any reason). You can check with 4 mm gap during fit up to meet client requirement.
> Sent on my BlackBerry® from Vodafone
>
> -----Original Message-----
> From: Raghuram Bathula <raghurambathula@gmail.com>
> Sender: materials-welding@googlegroups.com
> Date: Sun, 23 Sep 2012 08:10:03
> To: Materials & Welding<materials-welding@googlegroups.com>
> Reply-To: materials-welding@googlegroups.com
> Subject: [MW:15368] Re: Socket weld gap requirement
>
> no it it not required after welding, many times gap closes to zero due
> to shrinkage during welding. if your client requires the gap after
> welding (I don't see any reason for this) probably you need fit up
> with more gap.
>
> On Sep 22, 7:49 pm, Naresh Kumar <snareshkuma...@yahoo.com> wrote:
>> Dear experts,
>>
>> As per ASME 3.1.& 31.3 socket weld gap requirement is
>> 1/16” before welding. Whether it is required for after welding, if its require
>> kindly provide the code details.In our project we're done RT for socket welds. But
>> after welding did not find the 1/16” gap,
>> its less than 0.5mm. Our client decision is to cut and reweld the all joints.
>>
>>
>> Thanks & Regards,
>> Naresh
>
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Thanks & Regards
PRADEEPKUMAR HORMIS
QC WELDING INSPECTOR
ARAMCO PROJECT(JEDDAH REFINERY)
Mob:+966 - 59 11 36 36 9
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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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Thanks & Regards
PRADEEPKUMAR HORMIS
QC WELDING INSPECTOR
ARAMCO PROJECT(JEDDAH REFINERY)
Mob:+966 - 59 11 36 36 9
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