ASME B16.12:2019 pdf free download.Cast Iron Threaded Drainage Fittings.
\Combining values from the two systems constitutes nonconformance with the Standard. Some dimensions of steel pipe from ASME B36.IOM 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.
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 oIthe 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 1’/2 to 4. inclusive
(b) ±1.6 mm (0.06 in.) for NPS S 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. 1 OM), 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 81.20.1). 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.
ASME B16.12:2019 pdf free download
