ASME 16.48 pdf free download
ASME 16.48-2015 pdf free download.Line Blanks.
3 PRESSURE—TEMPERATURE RATINGS
3.1 Pressure Classes
Line blanks covered by this Standard are for the following pressure cLisses: 150, 300, 600, 900, 1500, and 2500 as listed in ASME B165.
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 11-2 of ASME H16.5 for the appropriate material and pressure class. For intermediate temperatures, 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 thc 38CC (100°F) rating rounded off to the next higher I 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 rating 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 or web (tie bar) may be integral or attached 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 deformation 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 prolections that would interfere with gasket seating.
addition to the thicknesses, I, listed in Tables 1 through 6 (Tables I-I through 1-6 in Mandatory Appendix 1).
4.3.2 Female Ring-Joint Blanks. Female ring-joint grooves shall be shaped with the groove side wall surface finish not exceeding 1.6 &m (63 pin.) Ra roughness. The finish of the gasket contact faces shall be judged by visual comparison with Ra standards (see ASME 846.1) and not by instruments having stylus tracers and electronic amplification.
4.3.3 Male Ring-Joint Blanks. The gasket shape (ring) for male ring-joint blanks shall not exceed 1.6 m (63 pin.) Ra roughness. The finish of the gasket contact faces shall be judged by visual comparison with Ra standards (see ASME 846.1) and not by instruments having stylus tracers and electronic amplification.
5 DIMENSIONS
5.1 General
Dimensions shall he in accordance with Tables I through 18 (Tables 1-I through 1-18).
5.2 Tolerances
5.2.1 Facing Tolerances. Tolerances for facings shall be in accordance with ASME 816.5.
5.2.2 Thickness Tolerances. Thickness tolerances are
Size Tolerance, mm (in.)
NPS < 18 +3.0. -0.0 (+0,12, —0.00)
M’S 20 +4.8. -0.0 (+0.19. -0.00)
5.3 Openings
(a) For NI’S 4, NI’S and NPS 1 blanks in all raised face classes, the inside diameter is equal to standard weight welding neck flange bore.
(b) For NI’S 1’4 and larger blanks in Classes 150 and 3(X) raised face, the inside diameter is equal to the pipe outside diameter.
(c) For NI’S i1/4 and larger blanks in Classes 600 and 900 raised face, the inside diameter is equal to Schedule 105 welding neck flange bore.
(d For Class 1500 raised face blanks, the inside diameter is equal to Schedule 40 welding neck flange bore.
(e) For Class 2500 raised face blanks, the inside diameter is equal to Schedule 40 through NI’S 6, Schedule 60 for NI’S 8 and NI’S 10, and Schedule 80 for NI’S 12.
(f) For all ring-joint blanks, the inside diameter is equal to the pipe outside diameter.
(g) Dimensions are based upon concentric installation of spiral wound gaskets with inner rings as required by ASME 1316.20 and conform to the maximum permitted bore of ASME 816.5 welding neck flanges described in Table 16 of ASME Bl6.20.ASME 16.48 pdf download.
