Could someone please tell me the origin of that restriction?
Is it not acceptable making the drill on a longitudinal seam on the carrier pipe?
Eduardo Calva
> Date: Sat, 12 Feb 2011 01:26:46 -0800
> Subject: [MW:9837] Re: Hot-tap hole
> From: palvarezmoro@gmail.com
> To: materials-welding@googlegroups.com
>
> Dear Mr. Calva
>
> The statement means that you are not allowed to weld or to hot tap
> (drill a hole in the pipe under pressure conditions) unless these
> operations are performed at distances farther than specified values
> from flanges, threaded connectiosn of welds.
>
> A Hot Tap is defined as using a drilling machine to cut a hole into an
> in-service, under-pressure piping system. This is done without service
> interruption or product leakage.
>
> Regards.
>
> Pedro Alvarez
> Materials Science PhD.
> LORTEK-Joining Research Center
> Ordizia-Spain
> palvarez@lortek.es
>
> On 11 feb, 03:04, Eduardo Calva <eduardoca...@hotmail.com> wrote:
> > Dears, could you please tell me what this statement of API RP-2201 mean?
> >
> > 6.8 WELDING AND HOT TAP CONNECTION DESIGN
> > Welding or hot tapping should not be permitted closer than
> > 18 in. (46 cm) to a flange or threaded connection, or approxi-
> > Mately 3 in. (8 cm) to a welded seam (including a longitudi-
> > nal seam of welded piping) unless determined by an
> > engineering review to be acceptable.
> >
> > Eduardo Calva
>
> --
> To post to this group, send email to materials-welding@googlegroups.com
> To unsubscribe from this group, send email to materials-welding+unsubscribe@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.
No comments:
Post a Comment