Siva and Paul
As a fact that we have experienced in our project which is an ammonia and urea
plant , ID is not a good unit for heavy wall thickness pipes.It is better to
calculate the welder progress based on IM ( inch meter ) of welding that is more
useful I suppose.
It would be appreciated if I could know your experinece in this regard too.
Cheers
Reza
Paul Bowers <pbowers@pipingdesign.com> wrote:
Thanks, Siva.
I assume that means (generally, since there are the other factors you mentioned that can vary) that butt welds over 20" diameter require multiple shifts. Can a partially-completed butt weld be left "overnight" and be continued the next day?
I'm referring to field welding, common Sch. 40 carbon steel.
Interesting that you mention climatic conditions. Some facilities have ambient construction temperatures that are lower than the usual -20 degrees F.
Paul
B.Sivasubramanian wrote:
>
> Dear Paul,
>
> The productivity of the Welds in Piping Works is a subject it self. The
production rate depends on the following factors
>
> 1) Whether the Weld is done in Fab Shop or Field
> 2) If in field whether it is Unit Piping or on Racks or on Pipes
> 3) MOC
> 4) Thickness of the Pipes (Schedule)
> 5) Pre weld / Post Weld heat treatment requirements
> 6) Welder's skill
> 7) Electrode Diameter used
> 8) Current used for Welding
> 9) Type of Welding Process (Manual / Semi Automatic / Orbittal etc)
> 10) Climatic Conditions
>
> etc.
>
> Just to give a guideline, if the work is in a typical hydrocarbon facility on
an average (say in a plant where the total quantum of works is 400,000 ID) you
may consider 20Inch Dia per Welder Day ( 1 Welder Day = 8 hours of Work)
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[Non-text portions of this message have been removed] Received on Sun Apr 17 01:07:00 2005
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