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ASME B16.9-2007 pdf download

ASME B16.9-2007 pdf download.Factory-Made Wrought Buttwelding Fittings.
1 SCOPE 1.1 General This Standard covers overall dimensions, tolerances, ratings, testing, and markings for factory-made wrought buttwelding fittings in sizes NPS 1 ⁄ 2 through NPS 48 (DN 15 through DN 1200). 1.2 Special Fittings Fittings may be made to special dimensions, sizes, shapes, and tolerances by agreement between the manu- facturer and the purchaser. 1.3 Fabricated Fittings Fabricated laterals and other fittings employing cir- cumferential or intersection welds are considered pipe fabrication and are not within the scope ofthis Standard. Fabricated lap joint stub ends are exempt from the above restrictions, provided they meet all the require- ments of the applicable ASTM material specification listed in section 5. 1.4 Standard Units The values stated in either metric or U.S. Customary units are to be regarded separately as standard. Within the text, the U.S. Customary units are shown in paren- theses. The values stated in each system are not exact equivalents; therefore, each system must be used inde- pendently of the other. Combining values from the two systems may result in nonconformance with this Standard. The designation for size is NPS for both metric- and customary-dimensioned fittings. Fitting pressure rating is associated with the connecting wall thickness of pipe of equivalent size and material. 1.5 References 1.5.1 Referenced Standards. Standards and specifi- cations adopted by reference in this Standard are shown in Mandatory Appendix II. It is not considered practical to identify the specific edition of each standard and specification in the individual references. Instead, the specific edition reference is identified in Mandatory Appendix II. A product made in conformance with a prior edition of referenced standards and in all other respects conforming to this Standard will be considered to be in conformance. 1 1.5.2 Codes and Regulations. A fitting used under the jurisdiction of the ASME Boiler and Pressure Vessel Code, the ASME Code for Pressure Piping, or a govern- mental regulation is subjectto any limitation ofthatcode or regulation. This includes any maximum temperature limitation, or rule governing the use of a material at low temperature. 1.6 Service Conditions Criteria for selection of fitting types and materials suitable for particular fluid service are not within the scope of this Standard. 1.7 Welding Installation welding requirements are outside the scope of this Standard. 1.8 Quality Systems Nonmandatory requirements relating to the fitting manufacturer’s Quality System Program are described in Nonmandatory Appendix A. 1.9 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 off 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 in expressing the limit. Decimal values and tolerances do not imply a particular method of measurement. 1.10 Pressure Rating Designation Class, followed by a dimensionless number, is the designationforpressure–temperature ratings. Standard- ized designations for flanges per ASME B16.5 referenced in this Standard are Classes 150, 300, 600, 900, 1500, and 2500. 2 PRESSURE RATINGS 2.1 Basis of Ratings The allowable pressure ratings for fittings designed in accordance with this Standard may be calculated as for straight seamless pipe of equivalent material (as shown by comparison of composition and mechanical properties in the respective material specifications) in accordance with the rules established in the applicable sections of ASME B31, Code for Pressure Piping. For the calculation, applicable data for the pipe size, wall thickness, and material that is equivalent to that of the fitting shall be used. Pipe size, wall thickness (or sched- ule number), and material identity on the fittings are in lieu of pressure rating markings. 2.2 Design of Fittings The design of fittings shall be established by mathe- maticalanalyses (e.g., ASME B16.49 for bends) contained in nationally recognized pressure vessel or piping codes, or at the manufacturer’s option by prooftesting in accor- dance with section 9 of this Standard. In order to meet design or manufacturing requirements, it is expected that some portion of formed fittings may have to be thicker than the pipe wall with which the fitting is intended to be used. The mathematical analyses, if used, may take into account such thicker sections. Records of mathematical analysis and/or successful proof test data shall be available at the manufacturer’s facility for inspection by the purchaser.

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