Abstract： ASME B16.29:2017 pdf download.Wrought Copperand Wrought Copper Alloy Solder-Joint Drainage Fittings - DWV. 10.3 Threading Tolerances Tapered pipe threads (NPT) shall be checked by use of plug or ring gauges. in either standard or limit type...

ASME B16.29:2017 pdf download.Wrought Copperand Wrought Copper Alloy Solder-Joint Drainage Fittings - DWV.

10.3 Threading Tolerances

Tapered pipe threads (NPT) shall be checked by use of plug or ring gauges. in either standard or limit types. When gauging

internal taper threads, the plug gauge shall be screwed hand tight into the fitting The reference point for gaugng internal product threads depends on the chamfer diameter. When the internal chamfer diameter exceeds the major diameter of the internal thread, the reference point shall be 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 shall be the end of the fitting. In gauging external taper

threads, the ring gauge shall be screwed handtight on the internal thread. On the external thread, the ring gauge shall he flush

with the end of the thread. Gauging practices shall be as shown in Notes (3) and (4) of Table 2. Straight pipe threads (NPSM) shall be checked by the use of standard GO and NOT GO plug and ring gauges.

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 5 mm in I m (O.( in. in I ft) (0.5%). other than in the direction of pitch (see section 3).

13 GAUGING

13.1 Standard Gauging Method of Solder-Joint Ends The standard method of gauging the diameter tolerances for male and female ends

shall he by use of plain plug and ring gauges designed to hold the product within the limits established in Table 1.

13.2 Optional Gauging Method of Solder-joint Ends

For gauging the diameter tolerance of male and female ends, the manufacturer may use direct reading instruments instead of ring and plug gauges as specified in para. 13.1. When gauging the diameters of male and female ends, using direct reading instruments, refer to section 9. In case of a dispute. ring/plug gauges shall be used as the referee method.

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