Medical Gas Systems 2021 101-125

While brazing medical-gas copper joints, a purge gas shall flow continuously to prevent the formation of copper oxide on the inside surface of the joint. What shall be used as a purge gas?

• A. oil-free, dry Nitrogen NF
• B. oil-less, dry Nitrogen NF
• C. oil-free, dry Argon MD
• D. any inert gas

Pipe labels shall be located at a maximum interval of how many feet?

• A. 10 ft
• B. 15 ft
• C. 20 ft
• D. 25 ft

Audible and visual alarm indicators shall meet which of the following requirements?

• A. Testing to determine indicator function should be scheduled periodically and records maintained between testing.
• B. The staff should be trained to operate the test button periodically and report malfunctions.
• C. Individual indicators shall NOT be less than DN20 size
• D. CGA C-7

Station outlets that operate at pressures other than standard gauge pressure (50-55 psi or 160-185 psi for nitrogen), what is required of the outlet labeling?

• A. be covered to limit access
• B. be located away from other outlets
• C. include the operating pressure along with the name of the gas
• D. none of the above

In compliance with NFPA 70, the new alarm wiring is being run installed underground from the initiating device at the source to a junction box located where the wiring first enters the building. NFPA 99 permits what minimum number of sets of wires to connect the initiating device with the junction box for each signal?

• A. 1
• B. 2
• C. 4
• D. 3

Which of the following filler metals shall be used to braze copper-to-copper joints in medical gas/vacuum distribution piping?

• A. BCuP series
• B. BAg series
• C. BNi series
• D. BAu series

NFPA 99 requires tubing to be cut square using a sharp tubing cutter that shall be free from grease, oil or other lubricants not suitable for oxygen service. What sort of treatment is permitted of the tube ends before brazing?

• A. May be reamed
• B. May be deburred or rolled smooth
• C. May be re-cleaned
• D. none of the above

To assure that all ambient air has been removed from the pipeline prior to brazing, a/an ______ shall be used to verify the effectiveness of the nitrogen purge.

• A. air analyzer
• B. breathalyzer
• C. nitrogen analyzer
• D. oxygen analyzer

Factory installed tubes on station inlets shall be NOT less than ________ with 0.4 inch minimum inside diameter.

• A. 1/4 NPS
• B. 3/8 NPS
• C. 1/2 NPS
• D. 1/8 NPS

The minimum backfilled cover for buried piping shall be 36 in., except that a minimum cover shall be reduced to ___________ where physical damage is otherwise prevented.

• A. 16 in
• B. 18 in
• C. 20 in
• D. 24 in