ASME B16.12:2019 pdf free download – Cast Iron Threaded Drainage Fittings
1.2 Applicability
This Standard covers fittings intended for use in gravitydrainage systems subject only to the gravity head of wasteliquids at temperatures from ambient to approximately10oc (212°F). The use of this Standard for pressurizedwaste handling systems is the responsibility of the userand is subject to the requirements of any applicable code.1.3 Quality Systems
Requirements relating to the product manufacturers’Quality system Programs are described inNonmandatory Appendix A.
1.4 References
Standards and specifications adopted by reference ‘nthis standard are shown in Mandatory Appendix .which is part of this Standard.It is not considered practical
to identify the specific edition of each referenced standardand specification in the text, when referenced. Instead, thespecific editions of the referenced standards and specifi-cations are listed in Mandatory Appendix l.
2 SIZE
2.1 Nominal Pipe Size
The size of the fittings scheduled in Tables 2.1-1 and2.1-2 is identified by the corresponding nominal pipesize (NPS). For reducing tees, Y-branches, or crosses,the largest run opening shall be given first.Thestraight-line sketches (Figure 2.1-1 ) illustrate how the re-ducing fittings are read.
Each fitting shall be marked with the manufacturer’sname or trademark in accordance with the requirementsof MSS Standard Practice No. SP-25.
MATERIALS
4.1 Castings
The dimensions prescribed in this Standard(Tables 4.1-1 through 4.1-11) are based on gray iron cast-
ings of high quality produced under regular control ofchemical and physical properties by a recognizedprocess. The manufacturer shall be prepared to certifythat the product has been so produced and that its chem-ical and physical properties, as proved by test specimens,are equal to the requirements specified in ASTM A126..2 Optionat Material
Drainage fittings are regularly made of cast iron.At theoption of the manufacturer, drainage fittings may be furn-ished of malleable iron complying with the minimumphysical requirements of ASTM A197.
5 DIMENSIONS AND TOLERANCES5.1 Dimensions
This Standard states values in both Sl (metric) and u.s.Customary units. These systems of units are to beregarded separately as standard. Within the text, theU.S. Customary units are shown in parentheses.The values stated in each systein are not exact equivalents;therefore, it is required that each system of units beused independently of the other. Combining valuesfrom the two systems constitutes nonconformance
with the Standard. Some dimensions of steel pipe fromASME B36.10M are listed for convenience inNonmandatory Appendix B in inches only.Tolerances ap-plicable to dimensions offittings are specified in paras.5.2through 5.6.
5.2 Metal Thickness
At no point in the castings shall the metal thickness beless than 90%of the values listed in Table 4.1-1.
5.3 Thread Chamber
The length of thread and total length of thread chamberto shoulder shall not vary from the dimensions shown inthe tables by more than plus or minus the equivalent of thepitch of one thread.
5.4 Outside Diameter and width of Band
The minus tolerances given in Table 2.1-1 are permittedon inspection to apply to the diameter of the band and thewidth of the band.
5.5 Inside Diameter of Fitting
The inside diameter shall not vary from dimensionsshown by more than the following:
(a) ±0.8 mm (0.03 in.) for NPS 11/2to 4, inclusive
(b) ±1.6 mm (0.06 in.) for NPS 5 to 8, inclusive5.6 Center-to-End
The center-to-end dimensions shall not vary from thegiven dimensions by more than the values given inTable 2.1-2.
5.7 Shoulder
These fittings are provided with shoulders so that whenused with Standard Wall Pipe (ASME B36.10M), the end ofthe pipe practically meets the shoulder as the joint is madeup, thereby forming a smooth passageway.