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Buttwelding ends less than 2-1/2"

Buttwelding ends less than 2-1/2"

Buttwelding ends less than 2-1/2"

(OP)
B16.25 Table 1,I-1; Dimensions of Welding Ends gives values for NPS down to 2-1/2".  Where could I obtain dimensions for buttwelding ends less than 2-1/2"?  

RE: Buttwelding ends less than 2-1/2"

(OP)
I see. Any idea though of a specification for buttwelding end dimensions less than 2-1/2, which is the miniumum given by B16.25.  

RE: Buttwelding ends less than 2-1/2"

Check Mark's Handbook, Fittings for steel pipe, page 8-211.  Fig 8.7.15
The joint prep is initially cut off square.  
The end is beveled 37.5 degrees +-2.5 degrees.  The edge is maintained square 1/32-3/32"  

If you use the Astro-Arc I mentioned before, you cut off the joints square.  there is a fitting that centers, guides, and provides the filler material.   

RE: Buttwelding ends less than 2-1/2"

You can design a "not standard" buttwelding end following the figures of B16.25(for small sizes fig.2) using the outside diameter and the thickness of the pipe (for example B36.10 dimensions). In this way you can calculate the inside diameter of weld preparation.
Usually, for cast products, B16.25 includes an addictional thickness on outside diameter of the schedule, while inside diameter is the same. For small diameters 1-2mm on OD may be enough to consider casting defects.
In the same way you can do also buttwelding ends for bigger sizes when pipe thickness or outside diameter are different from the ones in ASME B16.34.
Francesca
 

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