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
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