ASME B16.29-2017 pdf – Wrought Copper and Wrought Copper Alloy solder-Joint Drainage Fittings —DWv
ASME B16.29-2017 pdf – Wrought Copper and Wrought Copper Alloy solder-Joint Drainage Fittings —DWv.
This Standard for wrought copper and wrought copper alloy soider-,oint drainage fittings, designed for use with copper drainage tube conforming to ASTM B306, covers the Following:
(b) pitch (slope)
(c) abbreviations br end connections
(d) sizes and method at designating openings for reduring fltnngs
(g) dimensions and tolerances
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 (metrbc) and US Customary units. These systenss of units are to be regarded separately as standard- Within the test 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.
Codes, standards, and specifications, containing prow sions to the extent referessced herein, constitute requirements of this Standard. These reference documents are listed in Mandatory Appendix II.
11 THREADED ENDS
Fitting threads shall be right hand. conforming to ASME B120.t. They shall be American National Standard taper pipe threads (NPT). exCept for slip-joint ends, which shall have American National Standard free-Iltung straight mechanical pipe threads (NPSM).
All internal threads shall bc countersunk a dixtan not less than one-half the pitch of the thread at an angle of approximatt’ly 45 deg with the axis of the thread. All external threads shall be chamlered at an angle of 30 deg to 45 deg from the axis, Counlersinklisg 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
113.1 Internal Threads. Variations in NPT internal threading shall be limited to one turn large or one turn small from thc 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 esreeds this limit, the reference point becomes the last thread scratch on the chamfer cone.
12 DESIGN OF THREADED ENDS
External and Internal threaded ends of fittings will be furnished with a polygon to facilitate Installation.
The maximum allowable variation In the angular align’ ment of all openings shall he 5mm In I m (0.06 In. in 1ff) (0.5%). other than In the direction of pitch (see section 4).