OAR 918-225-0330. Exemptions for Unfired Pressure Vessels With an Inside Diameter of Six Inches and Less

(1) Vessels with an inside diameter or cross section diagonal not exceeding six inches, equipped with an approved pressure relieving device are exempt from ORS 480.510 to 480.665. (2) No limitations are placed on length of vessel or pressure. [Publications: Publications referenced are available from the agency.]