Abstract： ASME B16.9:2003 pdf download.FACTORY-MADE BUTTWELDING FITTINGS. 6.2.1 Fatigue Loading. For applications where fatigue loading is a concern, required minimum dimensions shall be furnished by the purchaser. 6.2.2 Boie Diameter. Bore diameters...

ASME B16.9:2003 pdf download.FACTORY-MADE BUTTWELDING FITTINGS.

6.2.1 Fatigue Loading. For applications where fatigue loading is a concern, required minimum dimensions shall be

furnished by the purchaser.

6.2.2 Boie Diameter. Bore diameters away from the ends are not specified. If special flow path requirements are

needed, the bore dimensions shall be specified by the purchaser.

6.2.3 Stub Ends. Service conditions and joint construction often dictate stub end length requirements. Therefore, the purchaser must specify long or short pattern fitting when ordering. [See General Note (c) in Tables 10 and

19.]

7 SURFACE CONTOURS

Where adjacent openings in fittings are not in parallel planes, they shall be joined by a circular arc or radius

on the external surfaces. The arc or radius may be terminated in tangents. Except as provided for block forgings (see para. 5), the projected profile of external surfaces of fittings shall not have sharp intersections

(corners) and/or collapsed.

8 END PREPARATiON

Unless otherwise specified, the details of the welding end preparation shall be in accordance with Table 1.

Transitions from the welding bevel to the outside surface of the fitting and from the root face to the inside

surface of the fitting lying within the maximum envelope shown in Fig. 1 are at the manufacturer’s option, except as covered in Note (5) of Fig. 1 or unless otherwise specifically ordered.

9 DESIGN PROOF TEST

9.1 Required Tests

Proof tests shall be made as set forth In this Standard when the manufacturer chooses proof testing to qualify the fitting design. Unless otherwise agreed upon between the manufacturer and purchaser, the proof test shall be one

based on the computed bursting pressure of the fitting and its connecting piping.

Lap joint stub ends are exempt from proof testing because they are used in a flange assembly, which will have

different ratings depending on service application.

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