ASME B16.48-2020 pdf download

ASME B16.48-2020 pdf download.Line Blanks.
ASME B16.48 covers pressure—temperature ratings, materials, dimensions, tolerances, marking, and testing for operating line blanks in sizes NPS 1/2 through NPS
24 for installation between ASME B16.5 flanges in the 150, 300, 600, 900, 1500, and 2500 pressure classes.
2 GENERAL
2.1 Definitions
2.1.1 Figure-8 BLank. A figure-8 blank (also called a spectacle blank) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar (see Figure 2.1.1-1).
2.1.2 PaddLe BLank. A paddle blank is similar to the solid end of a figure-8 blank. It has a plain radial handle. It is generally used in conjunction with a paddle spacer in large sizes.
2.1.3 PaddLe Spacer. A paddle spacer is similar to the open end of a figure-8 blank. It has a plain radial handle. It is generally used in conjunction with a paddle blank.
2.2 References
Codes, standards, and specifications, containing provisions to the extent referenced herein, constitute requirements of this Standard. These reference documents are listed in Mandatory Appendix I.
2.3 QuaLity Systems
Nonmandatory requirements relating to the product manufacturer’s Quality System Program are described in Nonmandatory Appendix A.
2.4 ReLevant Units
This Standard states values in both SI (Metric) and U.S. Customary units. These systems of units are to be regarded separately as standard. Within the text, the U.S. Customary units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, it is required that each system of units be used independently of the other. Combining values from the two systems constitutes nonconformance with the Standard.
(c) For NPS 11/4 and larger blanks in Classes 600 and 900 raised face, the inside diameter is equal to Schedule lOS 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 NPS 6, Schedule 60 for NPS 8 and NPS 10, and Schedule 80 for NPS 12.
(1) For all ring-joint blanks, the inside diameter is equal to the pipe outside diameter.
(g) Dimensions are based on concentric installation of spiral wound gaskets with inner rings as required by ASME B16.20 and conform to the maximum permitted bore of ASME B 16.5 welding neck flanges described in ASME B16.20, Table SW-2.5-3.
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 for line blanks shall be in accordance with ASME B16.5, Table 1A and shall include material restrictions cited in notes to ASME B 16.5, Tables 2 and 2C. The blank and spacer portions of line blanks shall be manufactured as one piece in accordance with the applicable material specification. Assembly of multiple 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 lB.
(c) For materials manufactured to editions of the material specification other than those listed in ASME B16.5, Mandatory Appendix II, refer to para. 6.2.
(d) Criteria for the selection of materials are not within the scope of this Standard.
6.2 MateriaLs Manufactured to Other Editions
Materials may meet the requirements of material specification editions other than those listed in ASME B 16.5, 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 requirements 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 (N PS)
(6) ring number (if applicable)
(b) Where space does not permit all of the above markings, they may be omitted in the reverse order given in (a).
(c) The B16 designation may be applied only when the line blank has been manufactured in full conformance with this Standard.