ASME B16.22:2018 pdf free download – Wrought Copper and Copper Alloy Solder-Joint Pressure Fittings
2.1 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 U.S. Customary units are shown in parentheses. 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.
2.2 References
Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix II. It is not considered practical to identify the specific editionofeachstandardandspecificationintheindividual references. Instead, the specific edition reference is iden- tified in Mandatory Appendix II.
3.1 Rating of Fittings and Joints
The internal pressure–temperature rating for a solder- joint system is dependent on not only fitting and tube strength, but also composition of the solder used for the joint and selection of valves and appurtenances.
3.1.1 Solder Joints. Pressure–temperature ratings for solderjoints to thedimensions of Table3.1.1-1, made with typical commercial solders, are given in Table I-1. Theinternalpressure–temperatureratingofthesystem with solder joints shall be the lowest ofthe values shown inTable 3.1.1-2 and Table I-1 and those ofthe tube, valves, and appurtenances.
3.1.2. Pressure–temperature ratings for braze joints to the dimensions of Table 3.1.1-1, made with typical commercial brazing materials, shall be considered equal to the values given in Table 3.1.1-2. Theinternalpressure–temperatureratingofthesystem withbrazejoints shallbe thelowestofthevalues shownin Table 3.1.1-2 and those of the tube, valves, and appurtenances.
3.2 Bursting Strength Fittings manufactured to the Standard shall have an ambient-temperature bursting strength of at least 4 times the 38°C (100°F) internal pressure rating as shown in Table 3.1.1-2.
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.
9.2 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.