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ASME B16.18-2021 pdf download

ASME B16.18-2021 pdf download.Cast Copper Alloy Solder Joint Pressure Fittings.
1 ð21Þ SCOPE This Standard establishes requirements for castcopper alloy solder joint pressure fittings designed for use by soldering or brazing with seamless copper water tube conforming to ASTM B88. Fittings made in accordance with this Standard are intended to be assembled with soldering materials conforming to ASTM B32, brazing materials conforming to AWS A5.8, or tapered pipe thread conforming to ASME B1.20.1. This Standard is allied to ASME B16.22 for wrought copper alloy pressure fittings and ASME B16.50, which covers wrought pressure fittings for brazing only. This Standard provides requirements for fitting ends of suitable depth to achieve required pressure ratings when joined by either soldering or brazing. It establishes re- quirements for the following: (a) pressure–temperature ratings (b) abbreviations for end connections (c) sizes and method ofdesignatingopenings offittings (d) marking (e) material (f) dimensions and tolerances (g) tests 2 GENERAL 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. In this Standard, the SI units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, it is required that each system ofunits 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 I, whichispartofthis Standard. Itisnotconsideredpractical to identify the specific edition ofeach standard and spec- ification in the individual references. Instead, the specific editions are identified in Mandatory Appendix I.
3 PRESSURE–TEMPERATURE RATINGS 3.1 Rating of Fitting and of Joint The internal pressure–temperature ratings of the fittings are shown in Table 3.1-1. The internal pressure–temperature rating for a solder joint fitting is dependent not only on fitting and tube strength, but also on the composition of the solder used for the joint and selection of valves and appurte- nances. Theinternalpressure–temperatureratingofthesystem shall be the lowest ofthe values shown in Table 3.1-1, the solder joint, and those of the tube, valves, or appurte- nances. The maximum recommended pressure–temperature ratings for solder joints using the dimensions of Table 8.2-2, made with typical commercial solders, are given in Nonmandatory Appendix A. 3.2 Bursting Strength Burststrengthat73°F± 5°F(23°C±2°C) shallbenotless than 4 times the 100°F (38°C) internal working-pressure rating shown in Table 3.1-1. For reducing fittings, the ap- plicable internal working pressure shall be that of the largest size of end connection. 4 FITTING SIZE AND ENDS The size of the fittings shown in Table 8.2-2 and Table A-1 corresponds to standard water tube size as shown in ASTM B88, Standard Specification for Seamless Copper Water Tube. The size of the threaded ends corresponds to nominal pipe size as shown in ANSI/ASME B1.20.1. Fittings are designated bythe size ofthe openings in the sequence illustrated in Figure 4-1. The followingsymbols are used to designate the type of fitting end: C = solder-joint fitting end made to receive copper tube diameter (female) F = internal ANSI standard taper pipe thread (female) NPT
5 MARKING Each fitting shall be permanently marked with the manufacturer’s name or trademark and other applicable markings as required by MSS SP-25. Marking of fittings less than Standard Water Tube Size 1 ∕ 2 or on any fitting where it damages soldering surfaces is not required. Fittings manufactured from cast copper alloys containing silicon shall be permanently marked with the designation Si. Fittings manufactured from cast copper alloys containing bismuth shall be permanently marked with the designation B or Bi. 6 MATERIAL (a) Castings intended for use in applications up to 400°F (204°C) shall be ofa copper alloyproduced to meet (1) the requirement of ASTM B62 Alloy C83600 (2) the tensile requirements of ASTM B584 Alloy C83800 or C84400 and, in all other respects, shall comply with the requirements of ASTM B62 (b) Castings intended for use in potable water applica- tions up to 200°F (93°C) shall be low lead (0.25% or less) and shall be (1) of a copper alloy produced to meet the require- ments of ASTM B584 Alloy C87850 or C89833, or (2) ofother cast copper alloys, provided the fittings produced meet mechanical and corrosion-resistant prop- erties needed for potable water application 7 METAL THICKNESS Dimensional variations occur in the casting process. Pattern equipment shall be designed to produce the metal thickness given for fittings in Table 8.2-2. The minimum wall thickness shall be not less than 90% of the body and jointwall thickness as shown in Table 8.2-2.

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