Section 53.12-1 - General (modifies HG-600 through HG-640)(a) The instruments, fittings and controls for heating boilers shall be as indicated in HG-600 through HG-640 of section IV of the ASME Boiler and Pressure Vessel Code (incorporated by reference; see 46 CFR 53.01-1 ) except as noted otherwise in this section.(b) For control systems for automatic auxiliary heating equipment, the requirements in part 63 of this subchapter govern and shall be followed.CGFR 68-82, 33 FR 18826, Dec. 18, 1968, as amended by USCG-2003-16630, 73 FR 65164, Oct. 31, 2008