ASME B16.9-2007 pdf free download.Factory-Made Wrought Buttwelding Fittings.
Unless otherwise specified, the details of the welding end preparation shall be in accordance with Table 12. 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. I are at the manufacturer’s option, except as covered in Note (5) of Fig. 1 or unless otherwise specilically ordered.
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 esempt from proof testing because they are used in a flange assembly, which will have different ratings depending on service application.
9.2 Test Assembly
9.2.1 Representative Components. Fittings that are representative of production and selected for testing shall be identified as to material, grade. and lot, including heat treatment. They shall be inspected for dimensional compliance to this Standard.
9.2.2 Other Components. Straight seamless or welded pipe sections 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. Any internal misalignment greater than 1.5 mm (0.06 in.) shall be reduced by taper boring at a slope not over 1:3. Length of pipe sections for closures shall be as follows:
ta) Minimum length of pipe shall be one pipe O.D. for NPS 14 (DN 3501 and smaller,
(b) Minimum length of pipe shall be one-half pipe O.D. for NI’S greater than 14 (UN 350).
9.3 Test Procedure
Tcxt fluid shall be water or o4lwr liquid used for hydrostatic testing. Hydrostatic pressure shall be applied to the assembly. The test is successful if the fitting withstands. without rupture. a proof test pressure at least
9.4.2 Thickness Rang.. One test fitting may be used toqualify similarly proportioned Fittings with 14) ranges from one-hall to three times that for the tested fitting.
9.4.3 MaterIal Grades. The pressure retaining capacity of a geometrically identical fitting made of vanous grades of steel will be directly proportional to the tensile properties of the various grades; see para. 2.1 Therefore, it is necessary to test only a single material grade in a representative fitting to prove the design of the fitting.
Hydrostatic testing of wrought fittings is not required by this Standard. All fittings shall be capable of withstanding, without leakage ci impairment of serviceabilit a hydrostatic test pressure required by the applicable piping code for seamless pipe of material equivalent to the fitting material, and of the sii and wall thickness the fitting marking identifies.
Tolerances for fittings are shown in Tables 13 and 1-12, arid apply to the nominal dimensions given in Tables 1 through 11 and Tables 1.1 through I-li Where given in the tables, the minimum and masimum dimensions are based on these tolerances. The listings with decimals do not imply precision measurement, such as use of vernier, micrometer. electronic readout equipment. etc.