ASME B16.29 pdf download WROUGHT COPPER AND WROUGHT COPPER ALLOY SOLDER JOINT DRAINAGE FITTINGS – DWV
6 MARKING Each fitting shall be marked permanently and legibly with the manufacturer’s name or trademark and with DWV (to indicate drain-waste-vent).
7 MATERIAL Fittings shall be made of wrought copper or wrought copper alloy material having not less than an 84% copper content.
8 LAYING LENGTHS Due to widely varying manufacturing processes, laying length dimensions of fittings are not standardized. Consult the manufacturer for these dimensions.
9 OVALITY Maximum ovality shall not exceed 1% of the maxmum diameter shown in Table 2. The average of the maximum and minimum diameters must be within the dimensions shown in the table.
10 THREADED ENDS
10.1 General Fitting threads shall be right-hand, conforming to ASME B1.20.1-1983(R2001). They shall be taper threads (NPT), except for slip joint ends, which shall have straight pipe threads (NPSM).
10.2 Chamfer All internal threads shall be chamfered 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, and all external threads shall be chamfered at an angle of 30 deg to 45 deg from the axis, for the purposes of easier entrance in making a joint and protection of the thread. Chamfering shall be concentric with the threads. The length of threads specified in all tables shall be measured to include the chamfer.
10.3 Threading Tolerances Tapered pipe threads (NPT) shall be checked by use of working plug or ring gages, either standard or limit types. Gages shall be threaded on/in hand tight. The reference point for gaging internal product threads depends upon the chamfer diameter. When the internal chamfer diameter exceeds the major diameter of the internal thread, the reference point is the last thread scratch on the chamfer cone. Otherwise, when the internal chamfer diameter does not exceed the major diameter of the internal thread, the reference point is the end of the fitting. On the external thread, the reference point shall be flush with the end of the fitting. Gaging practices shall be as shown in Notes 3 and 4 of Table 3. Straight pipe threads (NPSM) shall be checked by the use of standard GO and NOT GO plug and ring gages.
11 DESIGN OF THREADED ENDS External and internal threaded ends of fittings will be furnished with a polygon to facilitate installation.
12 ALIGNMENT The maximum allowable variation in the angular alignment of all openings shall be 0.06 in. in 1 ft (0.5%), other than in the direction of pitch (see section 3).
13.1 Standard Gaging Method of Solder Joint Ends The standard method of gaging the diameter toler- ances for male and female ends shall be by use of plain plug and ring gages designed to hold the product within the limits established in Table 2. 13.2 Optional Gaging Method of Solder Joint Ends For gaging the diameter tolerance of male and female ends, the manufacturer may use direct reading instru- ments instead of ring and plug gages as specified in para. 13.1. When gaging the diameters of male and female ends, using direct reading instruments, refer to section 9. In case of a dispute, ring/plug gages shall be used as the referee method.