ASME B16.29 pdf download.Wrought Copper and Wrought Copper Alloy Solder-Joint Drainage Fittings — DWV.
ASME B16.29 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
NJ sizes and method of designating openings for reducing fittings
fr) marking
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
US. Customary units are shown in parentheses or in separate 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 provisions to the extent referenced herein, constitute require. ments of this Standard. These reference documents are listed in Mandatory Appendix II.
11.1. General
Fitting threads shall be right hand, conforming to ASME B1.20.1. They shall be American National Standard taper pipe threads (N PT). 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 chamfering 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 Nil’ 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 t’or 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.
14.2 Optional Gaging Method of Solder-Joint Ends
For gaging the diameter tolerance of ecternal and internal ends, the manufacturer may use direct reading instruments instead of ring and plug gages as specified in para. 14.1. When gaging the diameters of external and internal ends using direct reading instruments, refer to section 10. In case of a dispute, ring/plug gages shall be used as the referee method.
ASME B16.29 pdf download
