ASME B16.39-2009 pdf download.Malleable Iron Threaded Pipe Unions Classes 150, 250, and 300.
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. Itis notconsidered 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. 1.7 Denotation 1.7.1 Pressure Rating Designation. Class, followed by a dimensionless number, is the designation for pressure–temperature ratings as follows: Class 150 250 300 1.7.2 Size. NPS, followed by a dimensionless num- ber, is the designation for nominal fitting size. NPS is related to the reference nominal diameter, DN, used in international standards.
9 HYDROSTATIC STRENGTH Assembled unions shall be capable of withstanding, without rupture or leakage through the shell or at the union joint, an internal hydrostatic pressure offive times the cold 66°C (150°F) pressure rating for 1 min. 10 TENSILE STRENGTH (a) Assembled unions shall be capable of withstand- ing, without rupture, the tensile loads shown in Table 2 and Table I-2. (b) Tests shall be conducted by attaching threaded steel bars or pipe to each end of the union using the pipe threads. Bars or pipe are to be secured in a tensile testing machine. Load shall be increased at a uniform rate until the tensile load is attained. 11 AIR PRESSURE TEST Assembled unions selected in accordance with section 12 shall be tested with air at a minimum pressure of 2.8 bar (40 psi). 12 SAMPLING FOR AIR PRESSURE TEST A random sample of unions representative of the pro- duction lot shall be submitted for testing in accordance with section 11. The average outgoing quality level (AOQL), as defined in ANSI/ASQ Z1.4, of the estab- lished acceptable sampling plans used shall not exceed 2%. A lot, for purposes of this Standard, is defined as the number of unions of the same size, design, and pressure rating submitted for testing at any one time. 13 COATINGS 13.1 Malleable Iron Unions When malleable iron unions are zinc coated, they shall be hot dipped in accordance with ASTM A 153 or have an electrodeposited zinc coating conforming to ASTM B 633, Type 1, Service Condition 4. Hot dipped coatings shall be a minimum thickness of 86 ?m (0.0034 in.) and applied prior to threading. Electrodeposited zinc shall be a minimum thickness of 25 ?m (0.001 in.) and may be applied either before or after threading.