ASME B16.12:2009 pdf free download

ASME B16.12:2009 pdf free download.Cast Iron Threaded Drainage Fittings.
3 MARKING
Each Fitting shall be marked with the manufacturer’s name or trademark in accordance with the requirements of MSS Standard Practice No. SP-25.
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 manufacturer 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 Gray Iron Castings 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 minimum 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 dimensions are the standard. Corresponding U.S. Customary values are given in Tables 11-3 through 11-13 in Mandatory Appendix 11. Some dimensions of steel pipe from ASME l336.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.
5.5 Inside Diameter of Fitting
The inside diameter shall not vary from dimensionsshown by more than the following:
a) for sizes 1/≤NPS≤4, inclusive =0.8 mm (0.03 in.)bfor sizes 5 ≤NPS≤ 8, inclusive ±1.6 mm (O.06 in.)5.6Center-to-End
The center-to-end dimensions shall not vary from thegiven dimensions by more than the values given inTable 2.
5.7 Shoulder
These fittings are provided with shoulders so thatwhen used with Standard Wall Pipe(ASME B36.10M).the end of the pipe practically meets the shoulder as thejoint is made up,thereby forming a smooth passageway.
6THREADING
a)All fittings (except roof connections) shall bethreaded with American National Standard Taper PipeThreads(ASME B1.20.1),and the variations in threadingshall be limited to one turn small and no turn large.Threaded openings without shoulder, however, shall belimited to one turn large and one turn small from thegaging notch on the plug when using working gages.Roof connections may have taper threads as above orAmerican National Standard Straight Pipe Threads, FreeFitting Mechanical Joint NPSM (ASME B1.20.1).
bWhen gaging internal threads, the notch shall beflush with the bottom of the chamfer, which shall beconsidered as being the intersection of the chamfer coneand the pitch cone of the thread.This depth is approxi-mately equal to one-half thread from the face of thefitting.
(c)All threads shall be countersunk a distance notless than one-half thread at an angle approximately45 deg with the axis of the thread, both for easierentrance in making a joint and for protection of thethread.Countersinking shall be concentric with thethread.