46 C.F.R. § 56.25-10 Flange facings.
Title 46 - Shipping
(a) Flange facings shall be in accordance with the applicable standards listed in Table 56.60–1(b) and MSS-SP-6. (b) When bolting class 150 standard steel flanges to flat face cast iron flanges, the steel flange must be furnished with a flat face, and bolting must be in accordance with §56.25–20 of this part. Class 300 raised face steel flanges may be bolted to class 250 raised face cast iron flanges with bolting in accordance with §56.25–20(b) of this part. [CGFR 68–82, 33 FR 18843, Dec. 18, 1968, as amended by CGD 77–140, 54 FR 40605, Oct. 2, 1989]
Title 46: Shipping
PART 56—PIPING SYSTEMS AND APPURTENANCES
Subpart 56.25—Pipe Flanges, Blanks, Flange Facings, Gaskets, and Bolting
§ 56.25-10 Flange facings.
