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Oklahoma Statutes - Title 40. Labor Page 212 require one or more details of noncode construction or which involve destruction or reduced life expectancy of those vessels; and 12. Hot water supply heaters as defined in subparagraph f of paragraph 1 of Section 141.1 of this title, with piping connections to the potable water supply system which are intended to supply hot water for domestic or commercial purposes other than space heating. However, the Commissioner shall make routine inspections and issue necessary orders regarding existing hot water supply heaters located in facilities or installations owned or operated by the State of Oklahoma or its agencies, counties, municipalities or school districts. B. The following boilers and pressure vessels shall be exempt from Sections 141.13 through 141.16 of this title: 1. Pressure vessels not exceeding fifteen (15) cubic feet in volume and two hundred fifty (250) pounds per square inch gauge pressure; 2. Low pressure steam boilers, hot water heating boilers, hot water supply boilers, hot water supply heaters or pressure vessels which are located in private residences or in apartment houses of less than six-family units; and 3. Pressure vessels operated entirely full of water or other liquid which is not materially more hazardous than water, provided the temperature of the vessel contents does not exceed one hundred fifty degrees Fahrenheit (150º F) or a pressure of two hundred (200) pounds per square inch gauge. C. 1. Either a special inspector or an inspector licensed by the Department of Labor shall inspect exhibitor boilers on an annual basis when exhibitor boilers are being operated at public events. Exhibitor boilers maintained by owner/operators for private use and not for operation for the public shall be exempt from inspection by this state. Annual inspections by this state or a special inspector shall consist of the following: a. an internal and external visual, b. threaded openings in the boiler may be inspected, when deemed appropriate, by the inspector after conducting an internal and external visual, c. a hydrostatic pressure test at one and twenty-five one-hundredths (1.25) times the maximum allowable working pressure, d. the maximum allowable working pressure shall not exceed one hundred eighty-five (185) pounds per square inch (psi), e. the ash pan and grates on a dry bottom vessel shall be removed to allow a visual inspection of the crown sheet, f. a visual inspection of the crown sheet on wet bottom boilers,