RMGA Medical Gas Systems Design & Components 5

Question 1

What is the purpose of a 'zone valve box' in a medical gas distribution system?

Accepted Answer

Provide accessible shutoff valves to isolate a specific patient care area

Answer

Zone valve boxes contain quarter-turn shutoff valves that allow specific care areas to be isolated for emergencies or maintenance without shutting down the entire system.

Question 2

When medical gas piping passes through a fire-rated wall or floor assembly, what is required at the penetration?

Accepted Answer

A firestop assembly rated to match the wall or floor assembly

Answer

All medical gas piping penetrations through fire-rated assemblies must be sealed with an approved firestop system to maintain the fire resistance rating.

Question 3

Which component differentiates a DISS (Diameter Index Safety System) connection from a standard threaded fitting in medical gas systems?

Accepted Answer

DISS uses a unique thread pitch and body diameter combination specific to each gas

Answer

DISS uses a non-interchangeable combination of thread pitch and body diameter unique to each gas, physically preventing cross-connection of gas-specific equipment.

Question 4

Medical gas piping in a new facility must be verified free of cross-connections by performing which specific test?

Accepted Answer

Cross-connection test using a single-gas pressurization and verification at all outlets

Answer

A cross-connection test pressurizes one gas system at a time and verifies that only the correct outlets respond, ensuring no piping is connected to the wrong gas header.

Question 5

What is the maximum total pressure drop allowed across a medical gas distribution system from the source to the most remote outlet under full design flow?

Accepted Answer

10 psig

Answer

NFPA 99 limits total pressure drop in a medical gas distribution system to no more than 10 psig from source to the farthest outlet at peak design flow.

(RMGA) Registered Medical Gas Administrator Certification Practice Test

(RMGA) Registered Medical Gas Administrator Certification Practice Test

RMGA Medical Gas Systems Design & Components 5