ASME B16.48-2005 pdf free download.Line Blanks.
3.3.2 Female Ring-Joint Blanks. Female ring-joint giø’es shall be shaped with the groove side wall surface finish not exceeding 1.6 p.m (63 pin,) 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,
33.3 Male Ring-Joint Blanks. The gasket shape (ring) for male ring-joint blanks shall not exceed 1.6 p.m (63 pin.) Ra roughness. The finish of the gasket contact laces shall be judged by visual comparison with Ra standards (see ASME H4&1) and not by instruments having stylus tracers and electronic amplification.
4 DIMENSIONS
4.1 General
Dimensions shall be in accordance with Tables I through 18 (Tables A-I through A-IS of Nonmandatory Appendix A).
4.2 Tolerances
4.2.1 Facing Tolecances Tolerances for facings shall be in accordance with ASME B16.5.
4.2.2 Thickness Tolerances. Thickness tolerances are
NI’S IS and smaller —zero ÷ 3.0 mm (0.12 in.)
NI’S 2() and larger —zero + 4.8 mm (0.19 in.)
43 Openings
(a) For NI’S ‘.4, NPS 4, and NI’S I blanks in all raised face dasses 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 300 raised lace, the inside diameter Lx equal to the pipe outside diameter.
(c) For NI’S V4 and larger blanks in Classes 600 and 900 raised lace, the inside diameter is equal to Schedule lOS welding neck flange bore.
(d) Fur Class 1500 raised face blanks, the inside diameter is equal to Schedule 40 welding neck flange bore.
(e) For Class 2.500 raised face blanks, the inside diameter Lx equal to Schedule 40 through NI’S 6, Schedule 60 for NPS S and NI’S 10, and Schedule 80 for NI’S 12.
(fi For all ring-point blanks, the inside diameter is equal to the pipe outside diameter.
(g) Dimensions are based upon concentric installation of spiral wound gaskeLs with inner rings as required by ASME B16.2(1 and conform to the maximum permitted bore of ASME B16.5 welding neck flanges described in Table 16 of ASME B16.20.
4.4 Facing Finish
Facing finish shall be In accordance with ASME 616.5. para. 6.43.
5 MATERIAlS
Materials for line blanks shall be in accordance with ASME 616.5, Table 1-A, and shall include material restrictions cited in notes to Tables 2 or F-2 of ASME 616.5. Recommended bolting materials for flange-blank assemblies are listed in ASME 616.5. Table 1-6.
Criteria for the selection of materials are not within the scope of this Standard.
6 MARKING
6.1 General
(a) tine 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 (N13)
(6) Ring number (it applicable)
(b) Where space does not permit all of the above markings. they may be omitted in the reverse order given in 6.1(a).
(C) The B16 designation may be applied only when the line blank has been manufactured in lull onformance with this Standard.
6.2 Marking Method
The marking shall be applied by steel stamping on the web (tie bar) or handle. Where space is limited. marking may be stamped on the outside edge of the blind portion of blanks.
7 PADDLE BLANK AND SPACER IDENTiFICATION
7.1 Paddle Handles
In order to differentiate between an installed paddle spacer and a paddle blank, it is required that there be an esternally visible distinction between the two as required by paras 7.2 and 7.3.
7.2 Paddle Blank Handles
Handles for paddle blanks shall be solid with no openings.
7.3 Paddle Spacer Handles
Handles for paddle spacers shall have a single through indicator hole located near the end of the handle. The hole diameter shall not be less than 12 mm (4 in.).
8 TESTING
Line blanks are not required to be pressure tested.