ASME B16-12:2009 pdf download

ASME B16-12:2009 pdf download.Cast Iron Threaded Drainage Fittings
1 SCOPE AND GENERAL
1.1 Scope This Standard for cast iron threaded drainage fittings covers (a) sizes and method of designating openings in reducing fittings (b) marking (c) material (d) dimensions and tolerances (e) threading (f) ribs (g) coatings (h) face bevel 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. 2.2 Denotation NPS, followed by a dimensionless number, is the des- ignation for nominal fitting size. NPS is related to the reference nominal diameter, DN, used in international standards. The relationship is, typically, as follows:
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 DIMENSIONS AND TOLERANCES
5.1 Dimensions Dimensions in SI (metric) units are given in Tables 3 through 13 for various types of fittings. Those dimen- sions are the standard. Corresponding U.S. Customary values are given in Tables II-3 through II-13 in Mandatory Appendix II. Some dimensions of steel pipe from ASME B36.10M are listed for convenience in Nonmandatory Appendix B in inches only. Tolerances applicable to dimensions of fittings are specified in paras. 5.2 through 5.6.
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. This depth is approxi- mately equal to one-half thread from the face of the fitting. (c) All threads shall be countersunk a distance not less than one-half thread at an angle approximately 45 deg with the axis of the thread, both for easier entrance in making a joint and for protection of the thread. Countersinking shall be concentric with the thread.