ASME B16.12-2009 pdf download.Cast Iron Threaded Drainage Fittings.
1.2 Applicability This Standard covers fittings intended for use in grav- ity drainage systems subject only to the gravity head of waste liquids at temperatures from ambient to approxi- mately 100°C (212°F). The use of this Standard for pres- surized waste handling systems is the responsibility of theuserandis subjectto the requirements ofanyapplica- ble code. 1.3 Quality Systems Requirements relating to the product manufacturers’ Quality System Programs are described in Nonmandatory Appendix A. 1.4 References Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix I, which is part ofthis Standard. Itis notconsidered practi- cal to identify the specific edition of each referenced standard and specification in the text, when referenced. Instead, the specific editions of the referenced standards and specifications are listed in Mandatory Appendix I. 2 SIZE 2.1 Nominal Pipe Size The size of the fittings scheduled in Tables 1 and 2 is identified by the corresponding nominal pipe size. For reducing tees, Y-branches, or crosses, the largest run opening shall be given first. The straight-line sketches (Fig. 1) illustrate how the reducing fittings are read.
3 MARKING Each fitting shall be marked with the manufacturer’s name or trademark in accordance with the requirements of MSS Standard Practice No. SP-25. 4 MATERIALS 4.1 Castings The dimensions prescribed in this Standard (Tables 3 through 13) are based on gray iron castings of high quality produced under regular control of chemical and physical properties by a recognized process. The manu- facturer shall be prepared to certify that the product has been so produced and that its chemical and physical properties, as proved by test specimens, are equal to the requirements specified in ASTM A 126, Specification for GrayIronCastings for Valves, Flanges, and Pipe Fittings. 4.2 Optional Material Drainage fittings are regularly made of cast iron. At the option of the manufacturer, drainage fittings may be furnished of malleable iron complying with the mini- mum physical requirements of ASTM A 197, Specification for Cupola Malleable Iron.
5.2 Metal Thickness At no point in the castings shall the metal thickness be less than 90% of the values listed in Table 3. 5.3 Thread Chamber The length of thread and total length of thread cham- ber to shoulder shall not vary from the dimensions shown in the tables by more than plus or minus the equivalent of the pitch of one thread. 5.4 Outside Diameter and Width of Band The minus tolerances given in Table 1 are permitted on inspection to apply to the diameter of the band and the width of the band. 5.5 Inside Diameter of Fitting The inside diameter shall not vary from dimensions shown by more than the following: (a) for sizes 1 1 ⁄ 2 ? NPS ? 4, inclusive ±0.8 mm (0.03 in.) (b) for sizes 5 ? NPS ? 8, inclusive ±1.6 mm (0.06 in.) 5.6 Center-to-End The center-to-end dimensions shall not vary from the given dimensions by more than the values given in Table 2. 5.7 Shoulder These fittings are provided with shoulders so that when used with Standard Wall Pipe (ASME B36.10M), the end of the pipe practically meets the shoulder as the joint is made up, thereby forming a smooth passageway. 6 THREADING (a) All fittings (except roof connections) shall be threaded with American National Standard Taper Pipe Threads (ASME B1.20.1), and the variations in threading shall be limited to one turn small and no turn large. Threaded openings without shoulder, however, shall be limited to one turn large and one turn small from the gaging notch on the plug when using working gages. Roof connections may have taper threads as above or American National Standard StraightPipe Threads, Free Fitting Mechanical Joint NPSM (ASME B1.20.1). (b) When gaging internal threads, the notch shall be flush with the bottom of the chamfer, which shall be considered as being the intersection of the chamfer cone and the pitch cone of the thread.
8 COATINGS Fittings may be furnished uncoated or may be coated with a bituminous composition or zinc coated by the hot dipped process. The coatings shall be applied prior to threading. 9 FACE BEVEL A bevel not exceeding 5 deg is permitted on the faces of fitting openings. Center-to-end, end-to-end, and width-of-band dimensions may include or exclude the bevel.