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Standard

MSS SP-97-2025

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This Standard Practice includes essential dimensions, finish, tolerances, testing, marking, material, and minimum strength requirements for 90° and 45° integrally reinforced forged branch outlet fittings of buttwelding, socket welding, and threaded types.Unless specified otherwise by the manufacturer, conventional integrally reinforced forged branch outlet fittings are intended for the following header by branch combinations: STD x STD, XS x XS, SCH 160 x SCH 160, XXS x XXS, XS x 3000, SCH 160 x 6000, and XXS x 9000.Mixed schedule branch outlet fittings are unique to the design of each system, dimensions must be agreed upon between purchaser and manufacturer and shall be marked with “SP97SPLD” as per Section 5.2 (f).The adequacy of the design for light, intermediate, and heavy wall branch outlet fittings may be established by mathematical analysis as contained in the applicable pressure vessel or piping codes, or by finite element analysis.Fittings manufactured to this Standard Practice are designed to make a fully reinforced branch connection in accordance with applicable piping code requirements, when attached, at an opening in a run pipe by means of a full penetration weld.Fittings, otherwise conforming to this Standard Practice, may be made to special dimensions, size, shape, tolerances, or other dimensional requirements of other wrought material by agreement between the manufacturer and the purchaser. See Section 5.2 (f) for supplemental marking requirements.Tables 2 through 7 show the fitting’s dimensional requirements in U.S. customary units or inches (decimal). Tables A2 through A7 show the fitting’s dimensional requirements in SI (metric) units (e.g., millimeters). The values stated in either U.S. customary or SI (metric) units are to be regarded separately as the Standard. Within the body text, the SI (metric) units are shown in parenthesis. Combining or converting values between the two systems of measurement may result in non-conformance within this Standard Practice. The values stated in each option are not exact equivalents; therefore, each measurement system must be used independently of the other.

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