(a) The provisions of this chapter shall not apply to:

(1) Inspection and installation permit requirements on air storage vessels located in service stations and garages;

(2) Air tanks of twelve gallons (12 gals.) or less containing one hundred fifty pounds per square inch (150 psi) or less;

(3) Boilers and unfired pressure vessels which are under the inspection regulations of the Interstate Commerce Commission;

(4) Boilers and unfired pressure vessels used for domestic purposes in private residences and apartment houses of eight (8) or fewer apartments;

(5) Unfired pressure vessels, other than air tanks or vessels listed in subdivisions (a)(1)-(4) of this section, where the maximum allowable working pressure is fifteen pounds per square inch (15 psi) or less or a volume of five cubic feet (5 cu. ft.) or less, coil-type steam generators without accumulative drum, or vessels used in connection with or the storage of liquefied petroleum gases. However, all such unfired pressure vessels shall be constructed in compliance with the appropriate regulations applicable thereto;

(6) Hot water heaters under two hundred thousand british thermal units (200,000 btu), except those heaters located in hospitals, schools, day care centers, and nursing homes;

(7) Hot water supply storage tanks which are heated by steam or any other direct or indirect means when heat input is less than two hundred thousand british thermal units per hour (200,000 btu/hr.), when water temperature is less than two hundred ten degrees Fahrenheit (210 degrees F), and when the vessel has nominal water-containing capacity of less than one hundred twenty gallons (120 gals.);

(8) Pressure vessels which are an integral part of:

(A) Components of rotating or reciprocating mechanical devices and hydraulic or pneumatic cylinders where the primary design considerations and stress are derived from the functional requirements of the device.

(B) The structure and have a primary function of transporting fluids from one (1) location to another within a system; and

(9) Vessels with a nominal water-containing capacity of one hundred twenty gallons (120 gals.) or less for containing water under pressure, including those containing air, the compression of which serves only as a cushion.

(b) This chapter shall not apply to inspection, installation permit requirements, or regulation of boilers and unfired pressure vessels used in connection with the production, distribution, storage, or transmission of oil, natural gas, or casinghead gas.