Sec. 755.022. EXEMPTIONS FOR CERTAIN BOILERS. (a) This chapter does not apply to: (1) boilers owned or operated by the federal government; (2) pressure vessels or process steam generators, other than steam collection or liberation drums of process steam generators; (3) manually fired miniature boilers that: (A) are constructed or maintained for locomotives, boats, tractors, or stationary engines only as a hobby for exhibition, recreation, education, or historical purposes and not for commercial use; (B) have an inside diameter of 12 inches or less or a grate area of two square feet or less; and (C) are equipped with a safety valve of adequate size, a water level indicator, and a pressure gauge; (4) boilers that are designed for operation only at atmospheric pressure and that are equipped with two independent means to prevent the buildup of pressure; (5) steam cookers; (6) espresso machines; (7) boilers that are a component of a medical device regulated by the United States Food and Drug Administration and are of a size that does not exceed: (A) an inside shell diameter of 16 inches; (B) 20 square feet of heating surface, unless the boiler is electric; (C) five cubic feet of gross volume, excluding the casing and insulation; and (D) an allowable working pressure of 100 pounds per square inch gauge; or (8) unfired pressure vessels in an autoclave. (b) Heating boilers used to heat buildings that are exclusively for residential use and that have accommodations for not more than four families are exempt from Sections 755.025 , 755.027 , 755.029 , and 755.030 .
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