ASME B16.47:2011 pdf free download

ASME B16.47:2011 pdf free download
ASME B16.47:2011 pdf free download.Large Diameter Steel Flanges
6.1.4 Flange Facing Finish. Flange facing finishes shall be in accordance with paras. 6.1.4.1 and 6.1.4.2, except that other finishes may be furnished by agreement between the user and the manufacturer. The finish of the gasket contact faces shall be judged by visual comparison with Ra standards (see ASME B46.1) and not by instruments having stylus tracers and elec- tronic amplification.
6.1.4.1 Ring-Joint. The side wall surface finish of the gasket groove shall not exceed 1.6 m (63 in.) roughness.
6.1.4.2 Other Flange Facings. Either a serrated concentric or serrated spiral finish, having a resultant surface finish from 3.2 m to 6.3 m (125 in. to 250 in.) average roughness shall be furnished. The cutting tool employed should have an approximate 1.5 mm (0.06 in.) or larger radius, and there should be from 1.8 grooves/mm through 2.2 grooves/mm (45 grooves/in. through 55 grooves/in.).
6.1.5 Flange Facing Finish Imperfections. Imperfec- tions in the flange facing finish shall not exceed the dimensions shown in Table 30 (Table I-28). Adjacent imperfections shall be separated by a distance of at least 4 times the maximum radial projection. A radial projec- tion shall be measured by the difference between an outer radius and an inner radius encompassing the imperfection where the radii are struck from the center- line of the bore. Imperfections less than half the depth of the serrations shall not be considered cause for rejection. Protrusions above the serrations are not permitted.
6.3 Bolting Bearing Surfaces
Flanges shall have bearing surfaces for bolting that are parallel to the flange face within 1 deg. Back facing or spotfacing shall notreduce the flange thickness below the dimensions t f given in Tables 31 through 41 (Tables I-29 through I-39). Spot facing or back facing shall be in accordance with MSS SP-9.
6.7 Hub Dimensions
Any modification to hub dimensions shown in Tables 31 through 41 (Tables I-29 through I-39) shall be by agreement between the purchaser and manufacturer and shall be confirmed by calculations in accordance with ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, Appendix 2. Flanges so modi- fied shall be marked with the material designation of the pipe to which they are to be welded in addition to the marking per para. 4.2.2.