ASME B16.48 pdf free download

ASME B16.48 pdf free download Line Blanks
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 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) maybe 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 spacerin all orientations withoutpermanentdeformation 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 may be specified for these blanks at the option of the purchaser. The height of the raised faces shall be in addition to the thicknesses, t, listed in Tables 4.3.1-1 through 4.3.1-6.
4.3.2 Female Ring-Joint Blanks. Female ring-joint grooves shall be shaped with the groove side wall surfacefinishnotexceeding1.6μm(63 μin.) Raroughness. The finish of the gasket contact faces shall be judged by visual comparison with Ra standards (see ASME B46.1) andnotbyinstruments havingstylustracers andelectron- ic amplification.
4.3.3 Male Ring-JointBlanks. The gasketshape (ring) formale ring-jointblanks shall notexceed1.6 μm (63 μin.) Ra roughness. The finish ofthe 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 4.3.1-1 through 4.3.1-6 and 5.1–1 through 5.1-12.
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.
5.4 Facing Finish Facing finish shall be in accordance with ASME B16.5, para. 6.4.5.
6 MATERIALS
6.1 General
(a) Materials forlineblanks shallbe inaccordancewith ASME B16.5, Table 1A and shall include material restric- tions cited in notes to ASME B16.5, Tables 2 and 2C. The blank and spacer portions of line blanks shall be manu- factured as one piece in accordance with the applicable material specification. Assembly ofmultiple pieces into a blank or spacer portion by welding or other means is not permitted by this Standard. Attachment of the handle or web (tie bar) to a blank or spacer portion by welding or other means is permitted.
(b) Recommended bolting materials for flange-blank assemblies are listed in ASME B16.5, Table 1B.
(c) Formaterials manufactured to editions ofthe mate- rial specification other than those listed in ASME B16.5, Mandatory Appendix II, refer to para. 6.2.
(d) Criteria forthe selection ofmaterials are notwithin the scope of this Standard.
6.2 Materials Manufactured to Other Editions Materials may meet the requirements ofmaterial spec- ification editions other than those listed in ASME B16.5, Appendix II, provided
(a) the materials are the same specification, grade, type, class, alloy, and heat-treated condition, as applicable (b) the line blank manufacturer certifies that the re- quirements of the edition of the specification listed in ASME B16.5, Mandatory Appendix II have been met
7 MARKING
7.1 General
(a) Line blanks shall be marked as follows:
(1) manufacturer’s name or trademark
(2) material, specification, and grade or class
(3) pressure class
(4) B16
(5) size (NPS)