Section 56.70-5 - Material(a)Filler metal. All filler metal, including consumable insert material, must comply with the requirements of Section IX of the ASME BPVC (incorporated by reference; see § 56.01-2 ) and § 57.02-5 of this subchapter.(b)Backing rings. Backing rings must comply with section 127.2.2. of ASME B31.1 (incorporated by reference; see § 56.01-2 ).CGFR 68-82, 33 FR 18843, Dec. 18, 1968, as amended by CGD 73-254, 40 FR 40165, Sept. 2, 1975; USCG-2002-13058, 67 FR 61278, Sept. 30, 2002; USCG-2003-16630, 73 FR 65184, Oct. 31, 2008