Class 5 Boiler Practice Exam 2026 - Free Boiler Certification Practice Questions and Study Guide

The correct answer is that refrigerant or air conditioning pressure vessels with a volume greater than 6 cubic feet are not exempt from ORS (Oregon Revised Statutes). This indicates that such pressure vessels must adhere to all the regulations and safety standards set forth in the ORS, regardless of their size, as they can pose significant safety risks due to the pressures involved.

Pressure vessels are required to be constructed, maintained, and operated according to specific codes and safety regulations to ensure the safety of personnel and the environment. The regulations are established to prevent hazards such as leaks, ruptures, and other accidents that could result from improper handling or maintenance.

The emphasis on regulatory compliance for all pressure vessels over a certain volume shows the importance of safety measures in the design and usage of such equipment, regardless of the specific circumstances, like whether they contain corrosive gases or are used for commercial purposes. This comprehensive regulation helps promote safe industry practices.