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Oklahoma Statutes - Title 40. Labor Page 211 3. Pressure vessels having an internal or external operating pressure not exceeding fifteen (15) pounds per square inch gauge - one hundred three (103) kilopascals gauge with no limit on size; 4. Pressure vessels having an inside diameter not exceeding six (6) inches (152mm) with no limitation on pressure; 5. Pressure vessels with a nominal water containing capacity of one hundred twenty (120) gallons or four hundred fifty (450) liters or less, to be used for domestic supply purposes, for containing water under pressure including those containing air, the compression of which serves only as a cushion; 6. Pressure vessels containing water heated by steam or other indirect means when none of the following limitations is exceeded: a. a heat input of two hundred thousand (200,000) British thermal units per hour - fifty-eight thousand six hundred (58,600) watts, b. a water temperature of two hundred ten degrees Fahrenheit (210º F), or c. a water containing capacity of one hundred twenty (120) gallons - four hundred fifty (450) liters; 7. Pressure vessels which may be classified as pressure containers which are integral parts of components of rotating or reciprocating mechanical devices such as pumps, compressors, turbines, generators, engines and hydraulic or pneumatic cylinders where the primary design considerations and/or stresses are derived from the functional requirements of the device, or structures whose primary function is the transport of fluids from one location to another within a system of which it is an integral part, i.e., piping systems; 8. Hot water supply boilers which are directly fired with oil, gas or electricity when none of the following limitations are exceeded: a. a heat input of two hundred thousand (200,000) British thermal units per hour - fifty-eight thousand six hundred (58,600) watts, b. a water temperature of two hundred ten degrees Fahrenheit (210º F), or c. a water containing capacity of one hundred twenty (120) gallons - four hundred fifty (450) liters; 9. Boilers and pressure vessels under federal control and railroad locomotive boilers; 10. Pressure vessels located on remote sites and limited to oil and natural gas gathering facilities or processing plants that have fewer than ten buildings intended for human occupancy per one- fourth (1/4) square mile and where the closest building is at least two hundred twenty (220) yards from any vessel; 11. Pressure vessels in the care, custody and control of research facilities and used solely for research purposes which