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ASME B16.47-2020 pdf download

ASME B16.47-2020 pdf download.Large Diameter Steel Flanges.

ASME issues Cases that are applicable to this Standard by, for example, adding new materials or alternative construction requirements. The Cases (a) modify the requirements of this Standard (b) are applicable from their issue dates until the Cases are annulled (c) may be used only when agreed to by the purchaser and the manufacturer, and when so agreed, the marking shall include the Case number 2 PRESSURE-TEMPERATURE RATINGS 2.1 General Pressure-temperature ratings are maximum allowable working gage pressures, in bar units, at the temperatures in degrees Celsius shown in Tables 3 through 28 for the applicable material and class designation. Tables 3C through 28C list pressure-temperature ratings using pounds per square inch [psi] units for pressure at the temperature in degrees Fahrenheit. For intermediate temperatures, linear interpolation is permitted. Interpo­ lation between class designations is not permitted.2.3.1 Basis. Pressure-temperature ratings apply to flanged joints that conform to the limitations on bolting in para. 5.3 and on gaskets in para. 5.4, and that are made up in accordance with good practice for alignment and assembly (see para. 2.2]. Use of these ratings for flanged joints not conforming to these limita­ tions is the responsibility of the user. 2.3.2 Mixed Flanged Joints. If the two flanges in a flanged joint do not have the same pressure-temperature rating, the rating of the joint at any temperature is the lower of the two flange ratings at that temperature. 2.4 Rating Temperature The temperature shown for a corresponding pressure rating is the temperature of the pressure-containing shell of the component. In general, this temperature is the same as that of the contained fluid. Use of a pressure rating corresponding to a temperature other than that of the contained fluid is the responsibility of the user, subject to the requirements of applicable codes and regulations. For any temperature below – 2 9 0C [-20oF〕, the rating shall be no greater than the rating shown for -29°C [-20°F]. See also para. 2.5.3. 2.5 Temperature Considerations 2.5.1 General. Use of flanges at either high or low temperatures shall take into consideration the risk of joint leakage due to forces and moments developed in the connected piping or equipment. Provisions in paras. 2.5.2 and 2.5.3 are included as advisory with the aim of lessening these risks.
4.2.1 Name. The manufacturer’s name or trademark shall be applied. 4.2.2 Materials. Materials shall be identified in the following ways : (a) Cast flanges shall be marked with the ASTM spec­ ification/ grade identification symbol [letters and numbers], and the melt number or melt identification. (b) Plate flanges and forged flanges shall be marked with the ASTM specification1 number and grade identifi­ cation symbol. (c) A manufacturer may supplement these mandatory material markings with a trade designation for the mate­ rial grade, but confusion of symbols shall be avoided. (d) For flanges manufactured from material that meets the requirements for more than one specification or grade of a specification listed in Table 1, see para. 4.2.8. 4.23 Rating Designation. The flange shall be marked with the number that corresponds to its pressure rating class designation [i.e., 75, 150, 300, 400, 600, or 900]. 4.2.4 Conformance. The designation B16 or B16.47 shall be applied to the flange, preferably adjacent to the class designation, to indicate conformance to this Stan­ dard. The use of the prefix “ASMEW is optional. 4.2.5 Temperature. Temperature markings are not required on flanges. However, if marked, the temperature shall be shown with its corresponding tabulated pressure rating for the material. 4.2.6 Size. The NPS identification number shall be marked on flanges.5.1.3 Cast Surfaces. Cast surfaces of flange pressure boundaries shall be in accordance with MSS SP-55, except that all Type I defects are unacceptable, and defects in excess of Plates “a” and “b” for Type II through Type XII are unacceptable. 5.2 Mechanical Properties Mechanical properties shall be obtained from test speci­ mens that represent the final heat-treated condition of the material required by the material specification.

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