Variation in Pipe thickness

[raj]

I have a query , when there is welding between two CS pipes of
different schedules ( different thickness) needs to be butt welded for
process piping application.

what is maximum variation in the thickness of two pipes , that will
ensure a safe weld.

Is there any code that provides any limitation or guidance .

Regards,

Vivek

[Ayhan GEDUK]

Dear Vivek, I think you will never get proper answer untill your working code. Best Regards, Ayhan GEDUK --- On Mon, 13/4/09, raj <ar.vi...@gmail.com> wrote:

New Email names for you! Get the Email name you've always wanted on the new @ymail and @rocketmail. Hurry before someone else does!

[ashish bhate]

Hi Vivek raj,

THere is no limitatin specifically given by any code.However to answer your query,kindly take a note.When two pipes with same outer diameter but different thickness is ti be Butt welded,inorder to match the inner diameter,the thicker pipe is to be tappered from inside .The length/slope of tapper specified may be different by various codes e.g. ASME Section I says(Page 120 nearabout) the Taper shall be 1:3 of the difference in thickness of pipe(Thk. difference is 4mm.  than taper shall be 12 mm in length,slope will be adjsted by itself).

Hope the query is understood,

Regards,

Ashish A. Bhate

Ph. Res.: 091-020-25667731
Mobile:9822099311

[abbey kangale]

I think Vivek is asking for tolerance in welding   you can refer to Asme B31.3 Chapter 5 for Fabrication and refer the welding for Circ welding details and toteances for allignment of welding   and WPS never tells about the misalignment tolerance they only specify limitations of welding thickness and.....   Abhijit --- On Tue, 4/14/09, ashish bhate <ashish...@gmail.com> wrote:

[Endri Prasetyo]

Dear Vivek,

 

For case of different thickness welding we can make bevel/taper at the thicker material. This is to avoid stress displacement which can affect a crack potential and abrasion erosion.

 

Referring to ANSI B31.3 the taper is 30 degree.

 

Regards,

Endri