ASME B16.26 pdf download Cast Copper Alloy Fittings for Flared Copper Tubes
1.1 General This Standard establishes specifications for cast cop- per alloy fittings and nuts used with flared seamless copper tube conforming to ASTM B 88 (water and gen- eral plumbing systems). Included are requirements for the following:
(a) pressure rating
(g) hydrostatic testing
Codes, standards, and specifications, containing pro- visions to the extent referenced herein, constitute requirements of this Standard. These reference docu- ments are listed in Mandatory Appendix II.
1.3 Convention For the purpose ofdetermining conformance with this Standard, the convention for fixing significant digits, where units or maximum or minimum values are speci- fied, shall be “rounding off” as defined in ASTM E 29, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications. This requires that an observed or calculated value be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of mea- surement.
1.4 Relevant Units This Standard states values in both 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 or in separate tables. 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. Combiningvalues fromthetwo systems constitutesnon- conformance with the standard.
1.5 Quality Systems Requirements relating to the product manufacturer’s quality system programs are described in Nonmanda- tory Appendix B.
1.6 Service Conditions Criteria for selection of materials suitable for particu- lar fluid service are notwithin the scope ofthis Standard.
2 PRESSURE RATING The fittings covered by this Standard are designed for a maximum cold water service-pressure of 1 200 kPa (175 psig).
3 SIZE The sizes of the fittings shown in Table 1 (Table I-1) correspond to standard water tube size as defined in ASTM B 88.
4 MARKING Each fitting shall be marked with the manufacturer’s name or trademark and other applicable markings as required by MSS SP-25, Standard Marking System for Valves, Fittings, Flanges and Unions. Marking offittings less than nominal size 1 ⁄ 2 is optional.
5 MATERIAL Castings shall be copper alloy produced to meet the following:
(a) the requirements of ASTM B 62, Standard Specifi- cation for Composition Bronze or Ounce Metal Castings, UNS C83600; or
(b) the chemical and tensile requirements of ASTM B 584, Standard Specification for Copper Alloy Sand Castings for General Applications, UNS C83800 or C84400, and in all other respects shall comply with the requirement of ASTM B 62.
6.1 Fitting and Nut The dimensions and tolerances of fittings and nuts shall be as shown in Table 1 (Table I-1). Design of the sealing surfaces of the fitting and nut shall be at the discretion of the manufacturer.
6.2 Tube Flare Dimensions relating to the flared end of the tube are described in Nonmandatory Appendix A. SI units are shown in Table A-1 and U.S. Customary units are shown in Table A-2.
7 THREADING Straight threads shall conform to ASME B1.1 Unified Inch Screw Threads (UN and UNR Thread Form) Class 2 2A external and Class 2B internal. The dimensions of straight threads are given in Tables 2 and 3 (Tables I-2 and I-3). Taper pipe threads (NPT) shall conform to ANSI/ASME B1.20.1, Pipe Threads, General Purpose (Inch). 8 HYDROSTATIC TEST Hydrostatic testing is not required.