(a) Flange facings shall be in accordance with the applicable standards listed in table 56.60-1(b) and MSS SP-6 (incorporated by reference; see 46 CFR 56.01-2).

(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; USCG-2003-16630, 73 FR 65176, Oct. 31, 2008]