ASME B16.9;2003 pdf download.FACTORY-MADE WROUGHT BUTTWELDING FITTINGS.
7SURFACE CONTOURS
Where adjacent openings in fittings are not in parallelplanes, they shall be joined by a circular arc or radiuson the external surfaces. The arc or radius may be termi-nated in tangents. Except as provided for block forgings(see para. 5), the projected profile of external surfacesof fittings shall not have sharp intersections (corners)and/or collapsed arcs.
END PREPARATION
Unless otherwise specified , the details of the weldingend preparation shail be in accordance with Table 1.Transitions from the welding bevel to the outside surfaceof the fitting and from the root face to the inside surfaceof the fitting lying within the maximum envelope showninFig. 1 are at the manufacturer's option,except ascovered in Note (5) of Fig. 1 or unless otherwise specifi-cally ordered.
DESIGN PROOF TEST9.Requlred Tests
Proof tests shall be made as set forth in this Standardwhen the manufacturer chooses proof testing to qualifythe fitting design. Unless otherwise agreed uponbetween the manufacturer and purchaser, the proof testshall be one based on the computed bursting pressureof the fitting and its connecting piping.
Lap joint stub ends are exempt from proof testingbecause they are used in a flange assemblv. which wilihave different ratings depending on service application.
