ASME B16.15-2006 pdf download.Cast Copper Alloy Threaded Fittings Classes 125 and 250.
1 SCOPE This Standard covers cast Classes 125 and 250 copper alloythreaded pipe fittingswithprovisions forsubstitut- ing wrought copper alloys for plugs, bushings, caps, and couplings in small sizes. This Standard includes (a) pressure–temperature ratings (b) size and method ofdesignating openings ofreduc- ing pipe fittings (c) marking requirements (d) minimum requirements for casting quality and materials (e) dimensions and tolerances in SI (metric) and U.S. Customary units (f) threading requirements (g) pressure test requirements Mandatory Appendix I provides table values in U.S. Customary units. 1.1 Convention For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits, maximum or minimum values, are speci- fied shall be rounded as defined in ASTM 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. Decimal values and tolerances do not imply a particular method of mea- surement. 1.2 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 the standard. Within the text the Customary units are shown inparentheses or in separate tables in Mandatory Appendix I. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Com- bining values from the two systems may result in non- conformance with the standard.
1.4 Quality Systems Requirements relating to the product manufacturer’s Quality System Programs are described in Nonmanda- tory Appendix A. 1.5 Denotation 1.5.1 Pressure Rating Designation. Class, followed by a dimensionless number, is the designation for pressure–temperature ratings (e.g., Class 125 and Class 250). 1.5.2 Size. NPS, followed by a dimensionless num- ber, is the designation for nominal fittings size (e.g., NPS 2). 1.6 Time of Purchase, Manufacture, or Intallation The pressure–temperature ratings in this Standard are applicable upon its publication to all fittings within its scope that otherwise meet its requirements. For unused fittings maintained in inventory, the manufacturer ofthe fittings maycertify conformance to this edition provided that it can be demonstrated that all requirements of this edition have been met. Where such components were installed in accordance with the pressure–temperature ratings of an earlier edition of this Standard, those rat- ings are applicable except as may be governed by the applicable code or regulation. 1.7 User Accountability This Standard cites responsibilities that are to be assumed by the fitting user in the areas of the tempera- ture at which the pressure rating is taken. 1.8 Service Conditions Criteria for selection of materials suitable for particu- lar fluid service are notwithin the scope ofthis Standard. 2 PRESSURE–TEMPERATURE RATINGS 2.1 General Pressure–temperature ratings for these pipe fittings are shown in Tables 1 and I-l. All pressures are gage.
2.3 Limitations Useofcoredplugs and hexagonoroctagonhead bush- ings should be limited to Class 125 pipe fittings. Solid plugs and face bushings are recommended for use with Class 250 pipe fittings. 3 SIZE 3.1 Nominal Pipe Size The size of the pipe fittings scheduled in the following tables is identified by the corresponding nominal pipe size (NPS). 1 3.2 Reducing Sizes In the case of reducing tees, crosses, and Y branches (laterals), the NPS of the largest run opening shall be given first, followed by the NPS of the opening at the opposite end of the run. Where the pipe fitting is a tee or Y branch (lateral), the NPS of the outlet is given last. Where the pipe fitting is a cross, the largest side-outlet opening is the third dimension given, followed by the opening opposite. The straight line sketches of Fig. 1 illustrate how the reducing pipe fittings are read. 4 MARKING 4.1 Class 125 Fitting EachClass125 pipe fittingshallbe marked foridentifi- cation with the manufacturer’s name or trademark.