ASME B16.48-2015 pdf download

ASME B16.48-2015 pdf download.Line Blanks.
2.7 Service Conditions Criteria for selection of materials suitable for particu- lar fluid service are notwithinthe scope ofthis Standard. 3 PRESSURE–TEMPERATURE RATINGS 3.1 Pressure Classes Line blanks covered by this Standard are for the fol- lowing pressure classes: 150, 300, 600, 900, 1500, and 2500 as listed in ASME B16.5. 3.2 Pressure–Temperature Ratings 3.2.1 Ratings. Ratings are the maximum allowable working gage pressure at the temperature shown in Tables 2 and II-2 of ASME B16.5 for the appropriate material and pressure class. For intermediate tempera- tures, linear interpolation between temperatures within a pressure class is permitted by ASME B16.5. 3.2.2 System Pressure Testing. Line blanks may be subjected to system tests at a pressure not to exceed 1.5 times the 38°C (100°F) rating rounded off to the next higher 1 bar (25 psi) increment. Testing at any higher pressure is the responsibility of the user, taking into account the requirements of the applicable code or regulation. 3.2.3 Mixed Material Joints. Should either the two flanges or the line blank in a flanged line blank assembly not have the same pressure–temperature rating, the rat- ing of the assembled joint at any temperature shall be the lower of the flange or line blank rating at that temperature. 4 DESIGN 4.1 Handle The handle orweb (tie bar) maybe integral orattached to the line blank or spacer. The web and its attachment shall be capable of supporting the weight of the blank or spacer in all orientations without permanent defor- mation to the web. 4.2 Edge Preparation In addition to machining, flame, plasma, saw cutting, and press punching are acceptable methods for forming the inside and outside diameters of line blanks. Surfaces shall be free of projections that would interfere with gasket seating. 4.3 Facing 4.3.1 Raised Face Joint Blanks. The gasket seating surface and dimensions for line blanks used with raised face flanges shall be in accordance with ASME B16.5. A raised face maybe specified forthese blanks atthe option ofthe purchaser. The heightofthe raised faces shall be in 2 addition to the thicknesses, t, listed in Tables 1 through 6 (Tables I-1 through I-6 in Mandatory Appendix I). 4.3.2 Female Ring-Joint Blanks. Female ring-joint grooves shall be shaped with the groove side wall sur- face finish not exceeding 1.6 ?m (63 ?in.) Ra roughness. 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. 4.3.3 Male Ring-Joint Blanks. The gasket shape (ring) for male ring-joint blanks shall not exceed 1.6 ?m (63 ?in.) Ra roughness. 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 electronic amplification. 5 DIMENSIONS 5.1 General Dimensions shall be in accordance with Tables 1 through 18 (Tables I-1 through I-18). 5.2 Tolerances 5.2.1 FacingTolerances. Tolerances for facings shall be in accordance with ASME B16.5. 5.2.2 Thickness Tolerances. Thickness tolerances are Size Tolerance, mm (in.) NPS ≤ 18 +3.0, −0.0 (+0.12, −0.00) NPS ≥ 20 +4.8, −0.0 (+0.19, −0.00) 5.3 Openings (a) For NPS 1 ⁄ 2 , NPS 3 ⁄ 4 , and NPS 1 blanks in all raised face classes, the inside diameter is equal to standard weight welding neck flange bore. (b) For NPS 1 1 ⁄ 4 and larger blanks in Classes 150 and 300 raised face, the inside diameter is equal to the pipe outside diameter. (c) For NPS 1 1 ⁄ 4 and larger blanks in Classes 600 and 900 raised face, the inside diameter is equal to Schedule 10S welding neck flange bore. (d) For Class 1500 raised face blanks, the inside diam- eter is equal to Schedule 40 welding neck flange bore. (e) ForClass 2500 raised face blanks, the inside diame- ter is equal to Schedule 40 through NPS 6, Schedule 60 for NPS 8 and NPS 10, and Schedule 80 for NPS 12. (f) For all ring-joint blanks, the inside diameter is equal to the pipe outside diameter. (g) Dimensions are based uponconcentric installation of spiral wound gaskets with inner rings as required by ASME B16.20 and conform to the maximum permitted bore of ASME B16.5 welding neck flanges described in Table 16 of ASME B16.20.