ASME B16.9-2018 pdf free

ASME B16.9-2018 pdf free.Factory-Made Wrought Buttwelding Fittings.
When special elbows are intended for held segmenting. the outside or inside diameter tolerance shall be furnished throughout the fitting by agreement between the manufacturer and the purchaser. Any mismatch on the outside or inside diameter needs to be corrected in the held by grinding back-welding or bridging of weld to meet the applicable piping code requirements. Although the elbow Intended for field segmenting must meet the requirernents of this Standard, once the field-segmented elbow Is cut It is not a B1&9 product
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 br block forgings (see section 5). the projected profile of external surfaces of fittings shall not have sharp intersections (corners) and/or collapsed arcs.
8 END PREPARATION
Unless otherwise specified, the details of the welding end preparation shall be in accordance with Table B-I. Transitions from the welding bevel to the outside surface of the fitting and from the root face to the inside surface of the fining lying within the maximum envelope shown In Figure it-I are at the manufacturer’s option, except as covered In Note (5) of Figure 8-1 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 qualifr the fittirg design The pressure design thickness for critical areas of each type of fining shall be determined and recorded. The design thickness for other sizes or wall thicknesses covered in para. 9.4 shall require a similar percentage of reinforcement proportional by size or thickness. Critical areas are normally the inner radius of elbows, the crotch of tees and crosses, the knuckle radius of caps, and the large ends of reducers. Proof test shall be based on the computed burst pressure of the fitting and Its connecting piping as defined in para. 9.3.
9.2 Test Assembly
9.2.1 RepresentatIve Components. Each fining type shall be iested, except that testing of certain types of fittings can qualify other fittings as descmbed in Table.
9.2.1-1. Fittings from the same material group that have the same basic design configuration and method of manufacture shall be selected from production for testing and shall be identified as to material, grade, and lot, including heat treatment.
(a) Examples of different basic configurations include the following:
(1) elbows of different centerline radius (short versus long versus 3D radius)
(2) tees or crosses formed in full encircling dies versus cold or hot extrusion using a pad die
(3) concentric versus eccentric shaped reducers (4? caps of different configurations
(b) Examples of different methods of manufacture include the following:
(1) mandrel-formed elbows versus elbows welded from two half-shells versus bent pipe
(2) cold-formed tees or crosses versus extruded tees versus machined from solid forgings
(3) conical reducers versus bell-shaped (integral tangents) reducers
(4) caps formed by extruding through a draw ring versus ends Cut off cold-formed tees versus machined from solids
(5) hot forming versus cold forming or using differential heating
9.2.2 Other Components. Straight seamless or welded pipe whose calculated bursting strength is at least as great as the proof test pressure as calculated in para. 9.3 shall be welded to each end of the fitting to be tested. Pipe sections may have the nominal wall greater than the thickness indicated by the fitting markings. That greater thickness shall not exceed 13 times the fitting markings wall. Any internal misalignment greater than 1.5 mm (0.06 in.) shall be reduced by taper boring at a slope not greater than 1:3. Any other unequal wall welding preparation shall be in accordance with ASME B16.25. Length of pipe sections for closures shall be as follows:
(a) Minimum length of pipe shall be one pipe O.D. for NI’S 14 (DN 350) and smaller.
(b) Minimum length of pipe shall be one-half pipe O.D. for NI’S greater than 14 (DN 350).
9.3 Test Procedure
To qualify a fitting by proof testing, the fitting shall be tested as described herein and shall withstand the minimum calculated pressure for at least 180 s (3 mm).ASME B16.9 pdf download.