Cast Copper Alloy Threaded Fittings Classes 125 and 250
|Publication Date:||1 January 2006|
This Standard covers cast Classes 125 and 250 copper alloy threaded pipe fittings with provisions for substituting wrought copper alloys for plugs, bushings, caps, and couplings in small sizes. This Standard includes
(b) size and method of designating openings of reducing 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.
For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits, maximum or minimum values, are specified 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 measurement.
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 in parentheses 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. Combining values from the two systems may result in nonconformance with the standard.
Requirements relating to the product manufacturer's Quality System Programs are described in Nonmandatory Appendix A.
Pressure Rating Designation.
Class, followed by a dimensionless number, is the designation
NPS, followed by a dimensionless number, is the designation for nominal fittings size (e.g., NPS 2).
Time of Purchase, Manufacture, or Intallation
This Standard cites responsibilities that are to be assumed by the fitting user in the areas of the temperature at which the pressure rating is taken.
Criteria for selection of materials suitable for particular fluid service are not within the scope of this Standard.