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ASME B16.18-2001 pdf download

1 SCOPE 1.1 General This Standard for cast copper alloy solder joint pressure fittings designed for use with copper water tube, establishes requirements for: (a) pressure-temperature ratings; (b) abbreviations for end connections; (c) sizes and method of designating openings of fittings; (d) marking; (e) material; (f) dimensions and tolerances; and (g) tests. 1.2 Units of Measurement The values stated in either U.S. Customary (inch- lb.) or SI (metric) units of measure shall be regarded separately as standard. Within the main text, U.S. Customary units are given. For convenience, the SI units are shown in parentheses and in Nonmandatory Annex B. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. NOTE: Combining values from the two systems may result in nonconformance with the Standard. 1.3 Convention For the purpose of determining conformance with this Standard, the convention for fixing significant digits where units, maximum or minimum values, are specified shall be “rounding off” as defined in ASTM Practice E 29. This requires that an observed or calculated value shall be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. 1 1.4 References Standards and specifications adopted by reference in this Standard are shown in Nonmandatory Annex D, which is part of this Standard. It is not considered practical to identify the specific edition of each standard and specification in the individual references. Instead, the specific edition reference is identified in Nonmanda- tory Annex D. 1.5 Quality System Requirements relating to the product manufacturer’s Quality System Programs are described in Nonmanda- tory Annex E. 2 PRESSURE-TEMPERATURE RATINGS 2.1 Rating of Fitting and of Joint The internal working-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 appurtenances. The internal working-pressure ratings of the system shall be the lowest of the values shown in Table 1 and Nonmandatory Annex A, and those of the tube, valves, or appurtenances. Pressure-temperature ratings for solder joints to the dimensions of Table 3, made with typical commercial solders, are given in Nonmandatory Annex A. 2.2 Bursting Strength When tested at 73°F±5°F (23°C±2°C) fittings manu- factured to this standard shall have an ambient-tempera- ture bursting strength of at least four times the 100°F (38°C) internal working-pressure rating as shown in Table 1.
8 INSPECTION TOLERANCE 8.1 Linear Dimensions An inspection tolerance as shown in Table 2 shall be allowed on center-to-shoulder, center-to-center, cen- ter-to-threaded end, and shoulder-to-threaded end di- mensions on all fittings having female solder (solder cup) ends, and on center-to-solder end and solder-to- threaded end dimensions on all fittings having male solder (fitting) ends. Coupling inspection limits for shoulder-to-shoulder and shoulder-to-end dimensions shall be double those shown in Table 2, except that the minus tolerance applied to dimensions M, N, and W, and Tables 7 and B7 shall not result in a dimension less than 0.06 in. (1.5 mm) for sizes 1 ⁄ 4 through 1 in., inclusive, or a dimension less than 0.09 in. (2.3 mm) for the larger sizes. The largest opening in the fitting governs the tolerance to be applied to all openings. Tables 3 through 19 offer dimensions for pressure fittings covered by this standard. 8.2 Ovality Maximum ovality shall not exceed 1% of the maxi- mum diameters shown in Table 3 or Table B3. The average of the maximum and minimum diameters must be within the dimensions shown in the table. 8.3 Gaging of Solder Joint Ends 8.3.1 Standard Gaging Method. The standard method of gaging the diameter tolerances for male and female ends shall be by the use of plain plug and ring gages designed to hold the product within the limits established in Table 3 or B3. 8.3.2 Optional Gaging Method. For gaging the diameter tolerance of male and female ends, the manu- facturer may use direct reading instruments instead of ring and plug gages as specified in para. 8.3.1. When gaging the diameters of male and female ends using direct reading instruments, refer to para. 8.2. 8.4 Standard Gaging Method of Threaded Ends The standard method of gaging the external and internal threaded ends shall be in accordance with the requirements of ASME B1.20.1.

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