ASME B16.12-2019 pdf download
ASME B16.12-2019 pdf download.Cast Iron ThreadedDrainage Fittings.
12 AppLicability
This Standard covers fittings intended for use in gravity drainage systems subject only to the gravity head of waste liquids at temperatures from ambient to approximately 100°C (212°F). The use of this Standard for pressurized waste handling systems is the responsibility of the user and is subject to the requirements of any applicable code.
1.3 QuaLity Systems
Requirements relating to the product manufacturers’ Quality System Programs are described in Nonmandatory Appendix k
1.4 References
Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix I, which is part of this Standard. It Is not considered practical to identity 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 2.1-1 and 2.1-2 is identified by the corresponding nominal pipe size (NPS). For reducing tees, Y-branches, or crosses, the largest run opening shall be given first. The straight-line sketches (Figure 2.1.1) illustrate how the reducing fittings are read.
5.2 MetaL Thickness
At no point in the castings shall the metal thickness be less than 90% of the values listed in Table 4.1-1.
5.3 Thread Chamber
The length of thread and total length of thread chamber 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 2.1-1 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) ±0.8 mm (0.03 in.) for NPS 11/2 to 4, inclusive
(b) ±1.6 mm (0.06 in.) for NPS 5 to 8, inclusive
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 2.1.2.
5.7 ShouLder
These fittings are provided with shoulders so that when used with Standard Wall Pipe (ASME B36.1OM). 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 Straight Pipe .
