ASME B16.24:2021 pd download

ASME B16.24:2021 pd download Cast Copper Alloy Pipe Flanges, Flanged Fittings, and Valves Classes 150, 300, 600, 900, 1500, and 2500
3 PRESSURE–TEMPERATURE RATINGS
3.1 General ð21Þ (a) For flanges and flanged fittings, the tabulated pres- sure–temperature ratings of Table 3.1-1 (Table 3.1-1C) shall apply for the materials listed in paras. 6.2.1 and 6.2.2, provided that the dimensional requirements of Tables 7.1.1-1, 7.1.1-2, 8.1.2-1, and 8.1.2-2 are met. (b) Requirements for valves made from ASTM B61 alloy C92200 and ASTM B62 alloy C83600 are covered by MSS SP-80. (c) For ASTM B148 alloys C95200, C95400, and C95800 flanges, and flanged and threaded end valves only, the tabulated pressure–temperature ratings of Tables 3.1-2, 3.1-3, and 3.1-4 shall apply, provided that the dimensional requirements of ASME B16.5 are met for flanges and applicable dimensional requirements of ASME B16.5 or ASME B16.47 are met for flanged valves. Threaded end valves shall have taper pipe threads (NPT) meeting the dimensional requirements of ASME B1.20.1.
3.2 Flanged Joints A flanged joint is composed of separate and indepen- dent, although interrelated, components. The flanges, the gasket,andtheboltingareassembledbyanotherinfluence —the assembler. Propercontrols mustbe exercised inthe selection and application for all these elements to attain a jointthathas acceptable leaktightness. Specialtechniques (e.g., controlled bolt tightening) are described in ASME PCC-1.
3.3 Pressure–Temperature Ratings of Flanged Joints Pressure–temperature ratings in this Standard applyto flangedjoints thatconformto the requirements onbolting inparas. 6.5 and9.1,ongasketsinparas.6.6and9.2,andto flanged joints that are made up in accordance with good practice for alignmentand assembly. Use ofthe pressure– temperature ratings for flanged joints not conforming to these requirements is the sole responsibility of the user. Requirements for alignment and assembly of joints and considerationofleakageduetoforcesandmomentsdevel- oped in the connected piping or equipment are not covered in this Standard. If the two flanges in a flanged jointdo nothave the same pressure–temperature ratings, the pressure–temperature rating of the joint at any temperature is the lower of the two flange pres- sure–temperature ratings at that temperature.
3.4 Rating Temperature The temperature shown for a corresponding pressure– temperature rating is the temperature of the pressure- containing shell of the flange, flanged fitting, or valve. In general, this temperature is the same as that of the contained fluid. Use of a pressure–temperature rating corresponding to a temperature other than that of the contained fluid is the responsibility of the user, subject to the applicable code or regulation. For any temperature below −29°C (−20°F), the pressure–temperature rating shall be no greater than the pressure–temperature rating for −29°C (−20°F). See para. 6.5.1 for temperature limitations on use of ASTM A307 bolting.
3.5 Low-Temperature Service Itis the responsibilityofthe user to verifythatall ofthe component materials (i.e., flange, bolting, and gasket) selected are acceptable for use in temperature applica- tions below −29°C (−20°F). When permitted, copper alloy flanges, flanged fittings, and valves manufactured inaccordance with this Standard, assembled with suitable bolting and gaskets, and subject to the applicable code or regulations shall not be used at temperatures below −198°C (−325°F) except for ASTM B148 alloy C95200, which can be used to −269°C (−452°F). For guidance on low-temperature service, refer to ASME B31T.
3.6 System Hydrostatic Test Flanged joints, flanged fittings, and flanged or threaded end valves may be subjected to system hydrostatic tests at pressures not to exceed 1.5 times the tabulated pressure at 38*C (100°F). System testing at higher pressures is the responsibility of the user, subject to the requirements of the applicable code or regulations.
4 SIZE AND METHOD 0F DESIGNATING OPENINGS
4.1 Flanges, Fittings, and Valves The size of a flange, ftting, or valve is identified by the corresponding NPS.
4.2 Reducing Fittings Reducing fttings shall be designated by the size of the openings in their proper sequence as indicated in Figure 4.2-1. 5 MARKING 5.1 General Except as modified herein, flanges, flanged fittings, and valves shall be marked as required in MSS SP-25.