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ASME B16.22-2018 pdf download

ASME B16.22-2018 pdf download.Wrought Copper and Copper Alloy Solder-Joint Pressure Fittings.
4.3 Definitions out-of-roundness: maximum measured diameter minus minimum measured diameter. ovality: elliptical condition associated with out-of- roundness. 5 ð18Þ MARKING Each fitting shall be permanently marked with the manufacturer’s name or trademark in accordance with MSS SP-25. Marking on fittings smaller than size 1 ∕ 2 or on any fitting where it damages soldering surfaces is not required. 6 MATERIAL (a) FittingsshallbemadefromcopperUNSNo.C10200, C12000, or C12200 or copper alloy UNS No. C23000, for which allowable stresses are found in ASME B31.1, ASME B31.9,orASMEBoilerandPressureVesselCode,SectionII, Part D. (b) Other coppers and copper alloys are permitted, provided they meet the chemical requirements of 84% minimum copper and 16% maximum zinc and provided the fittings produced from the copper alloy meet all the mechanical andcorrosion-resistantproperties forthe end purposes of the fittings. For potable water applications, fittings shall be produced from low-lead (0.25% or less) copper alloys and shall meet all the mechanical and corrosion-resistant properties for the end purposes of the fittings. The composition of the copper alloy shall contain nothing that will inhibit joining to the tube or to other fittings. 7 LAYING LENGTHS Due to widely varying manufacturing processes, mean- ingful laying length requirements of fittings cannot be established. Consult the manufacturer for these dimensions. 8 TUBE STOPS Except for repair couplings, fittings shall be manufac- turedwithatubestop. Repaircouplings shallnotrequirea tube stop. The tube stop shall control joint length, even with an external (FTG) end having the minimum outside diametershowninTable3.1.1-1. Examplesofvarioustube stop configurations are shown in Figure 8-1. 9 INSPECTION TOLERANCE 9.1 Convention For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum or minimum values) are specified shall be as defined in ASTM E29. This requires that an observed orcalculatedvalueberoundedofftothenearestunitinthe lastright-hand digitused forexpressingthe limit. Decimal values and tolerances do notimplya particular method of measurement. 9.2 ð18Þ Linear Dimensions An inspection tolerance, as shown in Table 9.2-1, shall be allowed on center-to-shoulder, center-to-center, center-to-threaded-end, and shoulder-to-threaded-end dimensions on all fittings having internal (C) solder ends, as well as on center-to-solder-end and solder- end-to-threaded-end dimensions on all fittings having external (FTG) solder ends. Couplinginspectionlimitsforshoulder-to-shoulderand shoulder-to-end dimensions shall be double those shown in Table 9.2-1, except that the minus tolerance applied to dimension L (see Figure 4.1-1) shall notresultin a dimen- sion smaller than 1.5 mm (0.06 in.). The largestopening in the fitting shall govern the toler- ance to be applied to all openings. 9.3 Ovality of Fitting End (C or FTG) Maximum ovalityofthe fittingsolder-jointend shall not exceed 1% of the maximum diameters shown in Table 3.1.1-1. The average of the maximum and minimum diameters shall be within the dimensions shown in the Table. 9.4 Inside Diameter of Fitting The minimum cross-sectional area of the inside diameter through the fitting body shall not be less than the theoretical minimum area defined by diameter O in Table 3.1.1-1. The out-of-roundness condition ofthe cross-sectional area shall not exceed the value shown in Table 3.1.1-1. For reducer or adapter fittings, the smallest end diameter shall apply, provided that this diameter does not restrict the other outlets. 9.5 Wall Thickness The minimum wall thickness shall not be less than that shown in Table 3.1.1-1. 10 THREADED ENDS Fittingthreads shall be right-hand, conformingto ASME B1.20.1. They shall be taper threads (NPT).
10.1 Countersink or Chamfer All internal threads shall be countersunk a distance no 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 ofthreads shall be measured to include the countersink or chamfer. 10.2 Threading Tolerances Tapered pipe threads (NPT) shall be checked by use of plug or ring gages in either standard or limit types. When gaging internal taper threads, the plug gage shall be screwed hand-tight into the fitting. The reference point for gaging 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 gaging external taper threads, the ring gage shall be screwed hand-tight on the external thread. On the external thread, the ring gage shall be flush with the end of the thread. Tolerance for an internal threaded end having an internal shoulder shall be from the gage reference point(notch) to oneturnsmall. Toleranceforaninternally threaded end without a shoulder, and for an externally threaded end, shall be from one turn small to one turn large.

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