ASME B16.18-2001 pdf free download.CAST COPPER ALLOY SOLDER JOINT PRESSURE FITTINGS
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.
1.4 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.
4 SIZE The size of the fittings shown in Table 3 and Table A1 corresponds to standard water tube size as shown in ASTM B 88, Specification for Seamless Copper Water Tube. The size of the threaded ends corresponds to nominal pipe size as shown in ASME B1.20.1. Fittings are designated by the size of the openings in the sequence illustrated in Fig. 1.
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.
6 MATERIAL Castings shall be copper alloy produced to meet: (a) the requirement of ASTM B 62 Alloy C83600; (b) the chemical and tensile requirements of ASTM B 584 Alloy C83800 or C84400 and in all other respects comply with the requirements of ASTM B 62.
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 3 or Table B3. The minimum wall-thickness shall not be less than 90% of the body and joint wall-thickness as shown in Table 3 or Table B3.ASME B16.18 pdf download.ASME B16.18-2001 pdf free download
