Receivers for medical air shall be equipped with which of the following?

• A. relief valves
• B. automatic and manual drains
• C. all of the above
• D. sight glass

Answer: (C)

Medical air receivers are designed to be safe, reliable storage for pressurized gas, and they must handle pressure safety, moisture management, and visibility. A relief valve provides overpressure protection: if pressure spikes, the valve vents gas to prevent a rupture or equipment damage. Drains address condensate formed during compression; an automatic drain continuously removes this condensate so moisture doesn’t accumulate and contaminate the gas, while a manual drain gives maintenance personnel the ability to remove water when needed or if the automatic system is offline. A sight glass offers a visual check of the receiver’s contents and the presence of condensate, helping operators monitor the system and confirm proper drainage and dryness. Because each feature serves a distinct safety and operational purpose, all of these are required.