Re: [MW:10151] Why small bore piping is Socket welded?

Corrigendum; SBP(small bore pipings as per API570)

On 3/4/11, Yogesh kumar <yogeshandpini@gmail.com> wrote:
> dear sir,
>
> We too have successfully implemented butt-welding in small bore piping
> up-to
> 1/2", of-course it's high pressure piping.
>
> Just get the PQR done and develop WPS as per SecIX,
>
> Recently,while a modification job ,problems of excess penetration came
> while
> often while welding small bore joints,so welder should be qualified for SBR
> before taking up the job.
>
>
> regards.
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Fri, Mar 4, 2011 at 12:54 PM, samshuddin k <sam.renja@gmail.com> wrote:
>
>> Dear all
>> in small dia pipe,root welding is very difficult and skilled welder is
>> required,and also if root is not uniform it will obstruct the flow
>>
>> regards
>> Samshuddin.K
>>
>>
>> On Fri, Mar 4, 2011 at 12:20 PM, Suresh <bobsuresh24@gmail.com> wrote:
>> > Hii Good day to all,
>> >
>> > SW using for piping when small bore and low heat input needed .if you
>> > for BW in small bore ,heat input may not be resisted for lower wall
>> > thickness ....
>> >
>> > best of my knowlwedge I would recommended strongly using SW for small
>> > bore unless vibratory or critical services .. we should mantained 2 or
>> > 3 mm gap when we are instering the pipe ...for heat expansion or
>> > contraction purpose....
>> >
>> > AS per ASME 31.3 for SW joints min 2 passes required ...
>> >
>> > Thank you
>> >
>> > Suresh
>> >
>> > On 3/4/11, Moscarda, Kim K <Kim.K.Moscarda@bhpbilliton.com> wrote:
>> >> G'day Jagdish, I would not recommend socket weld piping if it is in a
>> >> vibrating environment eg. Reciprocating compressors. Butt welds are
>> >> much
>> >> stronger.
>> >>
>> >> If you do go with socket weld, make sure they leave a small gap at the
>> end
>> >> of the pipe when they insert it. If the socket is installed flush then
>> you
>> >> will introduce residual stress when you weld i.e. heat expansion.
>> >>
>> >> Cheers
>> >>
>> >> Kim
>> >>
>> >> From: materials-welding@googlegroups.com
>> >> [mailto:materials-welding@googlegroups.com] On Behalf Of Fitria Rahman
>> >> Sent: Friday, 4 March 2011 9:57 AM
>> >> To: materials-welding@googlegroups.com
>> >> Subject: Re: [MW:10122] Why small bore piping is Socket welded?
>> >>
>> >> Hi Jagdish
>> >>
>> >> below is my view;
>> >> the socket weld are easier to be installed.
>> >> yes, you can use a butt weld for small bore piping. This has been
>> >> proven
>> >> successfully in our project.
>> >> Lastly, some disadvantage such as overstress, fatigue and others
>> >> disadvantage most likely happens in SW. Other thing also is BW
>> >> strength
>> is
>> >> better than FW.
>> >>
>> >> 2011/3/2 jagadish.dodiya@gmail.com<mailto:jagadish.dodiya@gmail.com>
>> >> <jagadish.dodiya@gmail.com<mailto:jagadish.dodiya@gmail.com>>
>> >> Why small bore piping is socket welded?
>> >> can i butt weld smallbore piping?
>> >> reson is bore geting ruduce OR less thichness?
>> >>
>> >> regards,
>> >> Jagdish
>> >>
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>> >
>> >
>> > --
>> > Thanks & Best Regards,
>> >
>> > Suresh
>> >
>> > Mobile No: 91-92 92 905 905
>> >
>> > --
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