Abstract： ASME B16.48:2005 pdf download.Line Blank. 4 DIMENSIONS 4.1 General Dimensions shall be in accordance with Tables I through 18 (Tables Al through A-iS of Nonmandatory Appendix A). 4.2 Tolerances 4.2.1 FacIng Tolerances. Tolerances for facing...

ASME B16.48:2005 pdf download.Line Blank.

4 DIMENSIONS

4.1 General

Dimensions shall be in accordance with Tables I through 18 (Tables Al through A-iS of Nonmandatory Appendix A).

4.2 Tolerances

4.2.1 FacIng Tolerances. Tolerances for facings shall be in accordance with ASME BIoS.

4.2.2 Thickness Tolerances. Thickness tolerances are

NI’S 18 and smaller —zero + 3.0 mm (0.12 in.)

NI’S 20 and larger —zero + 4.8 mm (0.19 in.)

4.3 Openings

(a) For NI’S ‘.j, NPS , and NI’S I 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 14 and larger blanks in Classes 600 and 900 raised lace, the inside diameter is equal to Schedule  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 lace 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 HO 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 816.20 and

conform to the maximum permitted bore of ASME 816.5 welding neck flanges described in Table 16 of ASME 816.20.

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