ASME B16.39:2009 pdf download

ASME B16.39:2009 pdf download.Malleable Iron Threaded Pipe Unions
1 SCOPE
1.1 General
This Standard covers threaded malleable iron unions, Classes 150, 250, and 300. It also contains provisions for using steel for NPS 1 ⁄ 8 unions. This Standard includes (a) design (b) pressure–temperature ratings (c) size (d) marking (e) materials (f) joints and seats (g) threads (h) hydrostatic strength (i) tensile strength (j) air pressure test (k) sampling (l) coatings (m) dimensions Mandatory Appendix I provides tables in U.S. Customary units.
1.2 References
Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix II, which is part ofthis Standard. It is not considered practi- cal to identify the specific edition of each referenced standard and specification in the text, when referenced. Instead, the specific editions of the referenced standards and specifications are listed in Mandatory Appendix II.
1.3 Quality Systems
Nonmandatory requirements relating to the fitting manufacturer’s quality system programs are described in Nonmandatory Appendix A.
1.4 Relevant Units
This Standard states values in both SI (metric) and U.S. Customary units. These systems of units are to be regarded separately. Within the text, the U.S. Customary units are shown in parentheses or in separate tables. The values stated in each table are not exact equivalents; therefore, it is required that each system of units be used independently of the other. Combining values from the two systems may constitute nonconformance with the Standard.
1.5 Service
Conditions Criteria for selection of materials suitable for particu- lar fluid service are notwithin the scope ofthis Standard.
1.6 Convention
For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits, maximum and 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 tolerance do not imply a particular method of measurement.
2 DESIGN
The complete union shall consist of a tail or male part, a head or female part, and a union nut. The type of joint may be ball-to-cone, ball-to-ball, or ball-and-socket with metal-to-metal seating surfaces of iron, copper, or cop- per alloy. The threaded ends shall be male or female pipe threads. The head or female part may be furnished as a coupling, an elbow, or a tee.
3 PRESSURE–TEMPERATURE RATINGS
(a) Pressure–temperature ratings are shown in Table 1 and Table I-1. (b) Unions with copper or copper alloy seats are not intended for use where temperature exceeds 232°C (450°F). (c) All ratings are independent of the contained fluid and are the maximum pressures atthe tabulated temper- atures. Intermediate ratings may be obtained by linear interpolation between the temperatures shown. (d) The temperatures shown for the corresponding pressure rating shall be the material temperature of the pressure-retaining structure. It may be assumed that the material temperature is the same as the fluid tempera- ture. Use of a pressure rating at a material temperature other than that ofthe contained fluid is the responsibility of the user and subject to the requirements of any appli- cable code.
4 SIZE
4.1 Nominal Pipe Size
As applied in this Standard, the use of the phrase “nominal pipe size” or the designation NPS followed by a dimensionless number is for the purpose of identi- fying the end connection of unions. The number is not necessarily the same as the fitting inside diameter. The connecting pipe dimension can be found in ASME B36.10M.