ASME B16.12 pdf free download
ASME B16.12-2019 pdf free download.Cast lron Threaded Drainage Fittings.
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_i-I are pemiitted on inspection to apply to the diameter of the band and the width of the hand.
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 111k to 4, inclusive
(b) ±1.6 mm (0.06 in.) for NPS 5 to 8. inclusive
5.6 Center-to-End
The centct -wind 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 (ASM E B36. IOM). the end of the pipe practically meets the shoulder as the loint Is made up, thereby forming a smooth passageway.
6 THREADING
(a) All littings (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
Threads, Free Fitting Mechanical Joint NPSM (ASME B 1.20.1).
(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 approximately 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.
(d) The length of thread specified in this Standard shall be measured to include the countersink.
(e) The maximum allowable variation In the alignment of threads of all openings of threaded fittings shall be 5 mm/rn (0.06 in./ft).ASME B16.12 pdf download.
