Re: 14, X-52 pipe joint

Hi Shabaz Khan

I am not familiar with B31.8. If it is an overland pipeline I would assume you will weld 4X12m lengths together on trestles and then roll them into the trench and make the final weld in and excavated pit. The final weld will be partly overhead. The pipe string will be aligned using tirfors and butted up to root spacers. I would alow 6 manhours for each of the above ground welds and 8 hours for the pit weld, assuming hydro test only. This is for welding only; not hauling ,aligning and placing, nor for trench/pit preparation, sanding bedding or backfill. It also assumes good operator skill a 75% work factor and a simple weld procedure of no more than 3 passes and no backgouging - chipping/brushing only. If you have a high code weld, add 50% to these times. For overland water pipes, I normally prefer butt straps as they simplify alignment.

You will need a second opinion before making a final decision.

Cheers

Steve Mckenzie

• Original Message ----- From: "Shahbaz Khan" <shahbaz2@tullow.com.pk> To: <PipingDesign@yahoogroups.com> Sent: Thursday, March 28, 2002 9:05 PM Subject: RE: [PipingDesign] 14", X-52 pipe joint

> Mr Steve,
> Thanks for the prompt response. My reply to your queries is as follows:
> 1)0.312"
> 2)Carbon Steel
> 3)The pipe would be bevelled ended. It would be welded in the field beside
a
> pipeline trench.
> 4)The code which is planned to be followed is ASME B31.8.
> Regards,
> Shahbaz Khan
>
> -----Original Message-----
> From: Steve McKenzie [mailto:Mechproj@xtra.co.nz]
> Sent: Thursday, March 28, 2002 12:35 PM
> To: <a href="/group/PipingDesign/post?postID=yFKQqaLW1OoWdHpLDR30lXUn0H825T2dekzuAmzzKn97M1ujr2A_oYdfFaZUuhB70ZetarqKPhxEiUvNnt4tCegq">PipingDesign@yahoogroups.com</a>
> Subject: Re: [PipingDesign] 14", X-52 pipe joint
>
>
> Hi Shabaz Khan
>
> depends on your code, welding procedure, testing requirements, equipment,
> location (field or shop joint) and motivation of the welder.
> If you can tell me the wall thickness, composition, etc etc
> Assuming sch40 wall thickness, mild steel and no code requirements I would
> allow 6 manhours for precut, prep, weld in a shop. 4 hours for weld alone,
> given decent rotation gear.
> For coded work add 50%. for TIG root allow another hour.
>
> Cheers,
>
> Steve McKenzie
>
>
> ----- Original Message -----
> From: "Shahbaz Khan" <shahbaz2@tullow.com.pk>
> To: <PipingDesign@yahoogroups.com>
> Sent: Thursday, March 28, 2002 7:35 PM
> Subject: [PipingDesign] 14", X-52 pipe joint
>
>
> >
> > How long a 14", X-52, ERW pipe joint would normally take in welding?
> > Regards,
> > Shahbaz Khan
> >
> >
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Received on Thu Mar 28 03:58:00 2002