ASME B16.12:2019 pdf free download

ASME B16.12:2019 pdf free download
ASME B16.12:2019 pdf free download.Cast Iron Threaded Drainage Fittings
5.7 Shoulder
These fittings are providedwith shoulders so thatwhen usedwith Standard Wall Pipe (ASME B36.10M), the end of thepipepracticallymeets theshoulderas thejointis 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 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 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. Counter- sinking shall be concentric with the thread.
(d) The length ofthread 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/m (0.06 in./ft).
(f) All fittings having openings of90 deg nominal angle shall be tapped with a pitch of21 mm/m (0.25 in./ft), with the pitch in the direction shown in Figure 6-1.
7 RIBS
The addition of ribs or lugs shall be allowed on any drainage fittings.
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 notexceeding 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.