ANSI MSS SP-44 pdf free download
ANSI MSS SP-44 pdf free download.Steel Pipeline Flanges.
3.1.5 Impact testing is not required on Grade F42 and lower. For Grades over F42, the Notch Toughness properties shall be determined with full size Charpy Type A, V-notch specimens, in accordance with ASTM A370. Sub-size specimens shall be used only when material to be tested is of insufficient thickness. All specimens shall be taken from the same location and orientation as the tensile, with the notch perpendicular to the surface. For plate, (blind flanges only), specimens shall be taken transverse to the direction of rolling. From each sheet of steel, one set (three specimens) shall be tested at a maximum temperature of -45 °C (-50 °F) and show 27 J (20 ft-lb) minimum average, 20 J (15 ft-lb) individual minimum. Percent shear shall be reported for informational purposes only.
The test specimens shall have received the same “working” and shall be in the same heat treatment as the flanges they represent, when determining the typical notch toughness properties of a given material.
3.1.6 Hardness Two hardness tests shall be made for each heat treatment lot by the Brinell method as specified in ASTM A370. When more than one forging is produced from each heat, a minimum of two forgings shall be tested with one reading from each forging. When only one forging is produced, it shall be tested in two locations. Hardness shall be HBW 235 as a maximum.
3.2 Bolting The bolting listed in Table 3 shall be used in flanged joints covered by this Standard Practice. Bolting produced from other materials may be used if permitted by the applicable code or governmental regulation. All bolting materials are subject to the following limitations.
3.2.1 High Strength Bolting Bolting materials having allowable stresses not less than those for ASTM A 193, Gr. B7 are listed as high strength in Table 3. These and other materials of comparable strength may be used in any flanged joint.
3.2.2 intermediate Strength Bolting The bolting materials listed as intermediate strength in Table 3, and other bolting of comparable strength, may be used in any flanged joint, provided the user verifies their ability to seat the selected gasket and maintain a sealed joint under expected operating conditions.
3.2.3 Low Strength Bolting Bolting materials having not more than 207 MPa (30 ksi) specified minimum yield strength arc listed as low strength in Table 3. These materials and others of comparable strength shall be used only in Class 150 and Class 300 joints, and only with gaskets as described in Section 3.3.2.
3.3 Gasket Material
3.3.1 The user is responsible for selection of gasket materials which will withstand the expected bolt loading without injurious crushing, and which are suitable for the service conditions. Particular attention should be given to gasket selection if a system hydrostatic test will exceed the test pressure specified in Section 8.2. Such a test involves the risk of excessive flange distortion.
3.3.2 Gasket dimensions for 1.5mm (1/16 in.) sheet mineral fiber in Tables 5 and Cl are based on a contact area equal to approximately twice the bolt root area. Class 150 flanged joints should use these exclusively.
3.3.3 Ring joint gasket materials shall conform to ASME B 16.20.
3.3.4 Sheet gaskets for NPS 10 and smaller shall conform to ASME B16.5 dimensions and recommendations.ANSI MSS SP-44 pdf download.
