ASME B16.29:2017 pdf download

ASME B16.29:2017 pdf download.Wrought Copper and Wrought Copper Alloy Solder-Joint Drainage Fittings – DWV
1 SCOPE
This Standard for wrought copper and wrought copper alloy solder-joint drainage fittings, designed for use with copper drainage tube conforming to ASTM B306, covers the following: (a) description (b) pitch (slope) (c) abbreviations for end connections (d) sizes and method of designating openings for redu- cing fittings (e) marking (f) material (g) dimensions and tolerances
2 GENERAL
2.1 Convention For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum and minimum values) are specified shall be as defined in ASTM E29. This requires that an observed or calculated value be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement. 2.2 Relevant Units This Standard states values in both SI (metric) and U.S. Customary units. These systems of units are to be regarded separately as standard. Within the text, the U.S. Customary units are shown in parentheses or in sepa- rate tables that appear in Mandatory Appendix I. The values stated in each system are not exact equivalents; therefore, it is required that each system of units be used independently of the other. Combining values from the two systems constitutes nonconformance with the Standard. 2.3 References Codes, standards, and specifications, containing provi- sions to the extent referenced herein, constitute require- ments of this Standard. These reference documents are listed in Mandatory Appendix II.2.4 Quality Systems Guidelines relating to the product manufacturer’s quality system programs are described in Nonmandatory Appendix A.
3 DESCRIPTION
These fittings are designed for drainage and vent systems only, using the solder-joint method of connection. The fitting cups (C) are provided with stops so that the ends of the tube, when assembled, meet the stops. Sketches and designs of fittings are illustrative only. The dimensions specified herein shall govern in all cases.
4 PITCH (SLOPE)
All nominal 90-deg fittings shall be pitched to result in a slope of 0.20 mm/m (0.25 in./ft) (2%) of horizontal tube length with reference to a horizontal plane.
6 COMPONENT SIZE
6.1 Nominal Size As applied in this Standard, the use of the phrase “nominal size” followed by a dimensionless number is for the purpose of fitting end connection size identification. 6.1.1 Tube. The size designations for the fitting end configurations defined in Table 1 (Table I-1) correspond to drainage tube sizes defined in ASTM B306.
11 THREADED ENDS
11.1 General Fitting threads shall be right hand, conforming to ASME B1.20.1. They shall be American National Standard taper pipe threads (NPT), except for slip-joint ends, which shall have American National Standard free-fitting straight mechanical pipe threads (NPSM). 11.2 Chamfer All internal threads shall be countersunk a distance not less than one-half the pitch of the thread at an angle of approximately 45 deg with the axis of the thread. All external threads shall be chamfered at an angle of 30 deg to 45 deg from the axis. Countersinking and cham- fering shall be concentric with the threads. The length of threads shall be measured to include the countersink or chamfer. 11.3 Threading Tolerances 11.3.1 Internal Threads. Variations in NPT internal threading shall be limited to one turn large or one turn small from the gaging notch when using working gages. The reference point for gaging is the starting end of the fitting, provided the chamfer does not exceed the major diameter of the internal thread. When a chamfer on the internal thread exceeds this limit, the reference point becomes the last thread scratch on the chamfer cone. 11.3.2 External Threads. Variations in NPT external threading shall be limited to one turn large or one turn small from the gage face of ring when using working gages. The reference point for gaging is the end of the thread, provided the chamfer is not smaller than the minor diameter of the external thread. When a chamfer on the external thread exceeds this limit, the reference point becomes the last thread scratch on the chamfer cone.