NFPA 99 MedGas for 6010 Installer
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1. Which of the following is NOT permitted to have its system supply
source located in an outdoor enclosure?
✅ Medical air compressors
NFPA 99 requires that medical air compressors be housed in a controlled,
indoor environment to prevent contamination and maintain system
integrity.
2. When is the initial pressure test conducted by the installer?
✅ After blowdown of the distribution piping
The initial pressure test is performed after the blowdown procedure to
verify the integrity of the piping system before it is placed into service.
3. What is the primary purpose of a medical gas zone valve?
✅ To shut off gas supply in a specific area
Zone valves are strategically placed to isolate sections of a medical gas
system for maintenance, emergency shutoff, or system modifications
without affecting the entire facility.
4. According to NFPA 99, which color identifies medical oxygen
piping?
, ✅ Green
Medical oxygen piping is identified with a green background color in the
U.S., per NFPA 99 standards. A yellow label is used for medical vacuum.
5. What is the maximum allowable concentration of gaseous
hydrocarbons in a medical air system?
✅ Less than 25 ppm
Monitoring hydrocarbon levels is critical to prevent contamination and
maintain the purity of the breathing air supplied to clinical areas.
6. According to ASSE 6010, who is authorized to install medical gas
systems?
✅ A certified ASSE 6010 medical gas installer
ASSE 6010 certification is a specific qualification required for individuals
who install medical gas and vacuum systems.
7. Which of these is an NFPA 99 requirement for the labeling of pipes
in a medical gas system?
✅ Color coding
NFPA 99 mandates color-coding as a primary method for identifying the
contents of medical gas piping.
8. What is the maximum allowable moisture concentration (dew point)
for a medical air system?
✅ -40°F or lower
Maintaining a low dew point is crucial to prevent moisture from condensing
in the pipelines, which protects equipment and inhibits bacterial growth.
, 9. When does the master alarm system activate for the medical air dew
point?
✅ When the medical air dew point goes above 35 degrees F
The master alarm provides a central warning when the quality of the
medical air, specifically its moisture content, exceeds safe limits.
10. What is the minimum distance required between a liquid oxygen
tank and a building opening?
✅ 15 ft
This separation distance is a safety requirement to prevent fire hazards
from a potential leak near building air intakes or openings.
11. If a brazer has not performed a qualified brazing procedure for
more than six months, what is required?
✅ Re-qualification by performing the procedure again
Performance qualifications for brazers remain in effect indefinitely only if
the brazer continues to perform the procedure regularly; a lapse of six
months requires requalification.
12. How should cylinders in a manifold be secured?
✅ Double chains or restraints
NFPA 99 requires at least two restraints (chains, straps, or brackets) per
cylinder to prevent tipping and ensure safety.
13. What is the minimum required pressure for a medical air system at
the outlet?
✅ 50 psi
, A minimum pressure of 50 psi is required at the outlet to ensure adequate
flow for medical devices.
14. What is the required air exchange rate for a manifold room for
medical gas cylinders?
✅ 6 air changes per hour (ACH)
This ventilation rate helps prevent the accumulation of leaked gases in the
event of a cylinder leak.
15. How often must source system alarms be tested?
✅ Annually
NFPA 99 requires annual testing of all source system alarms to ensure they
are functioning correctly.
16. What is the required melting point for components of surface-
mounted medical gas rails?
✅ 1000 degrees F
Rail components must have a high melting point to maintain their integrity
in the event of a fire.
17. What is the required certification for installing a Category 3
medical gas piped distribution system?
✅ ASSE 6010
NFPA 99 requires that all individuals who install, braze, or perform work on
any medical gas piping system—regardless of the facility's risk category—
must hold an ASSE 6010 certification.
18. What is the maximum allowable concentration of oil vapor in
medical air?
Newest With Complete All 300 Questions
And Correct Detailed Answers| Brand
New Version!
1. Which of the following is NOT permitted to have its system supply
source located in an outdoor enclosure?
✅ Medical air compressors
NFPA 99 requires that medical air compressors be housed in a controlled,
indoor environment to prevent contamination and maintain system
integrity.
2. When is the initial pressure test conducted by the installer?
✅ After blowdown of the distribution piping
The initial pressure test is performed after the blowdown procedure to
verify the integrity of the piping system before it is placed into service.
3. What is the primary purpose of a medical gas zone valve?
✅ To shut off gas supply in a specific area
Zone valves are strategically placed to isolate sections of a medical gas
system for maintenance, emergency shutoff, or system modifications
without affecting the entire facility.
4. According to NFPA 99, which color identifies medical oxygen
piping?
, ✅ Green
Medical oxygen piping is identified with a green background color in the
U.S., per NFPA 99 standards. A yellow label is used for medical vacuum.
5. What is the maximum allowable concentration of gaseous
hydrocarbons in a medical air system?
✅ Less than 25 ppm
Monitoring hydrocarbon levels is critical to prevent contamination and
maintain the purity of the breathing air supplied to clinical areas.
6. According to ASSE 6010, who is authorized to install medical gas
systems?
✅ A certified ASSE 6010 medical gas installer
ASSE 6010 certification is a specific qualification required for individuals
who install medical gas and vacuum systems.
7. Which of these is an NFPA 99 requirement for the labeling of pipes
in a medical gas system?
✅ Color coding
NFPA 99 mandates color-coding as a primary method for identifying the
contents of medical gas piping.
8. What is the maximum allowable moisture concentration (dew point)
for a medical air system?
✅ -40°F or lower
Maintaining a low dew point is crucial to prevent moisture from condensing
in the pipelines, which protects equipment and inhibits bacterial growth.
, 9. When does the master alarm system activate for the medical air dew
point?
✅ When the medical air dew point goes above 35 degrees F
The master alarm provides a central warning when the quality of the
medical air, specifically its moisture content, exceeds safe limits.
10. What is the minimum distance required between a liquid oxygen
tank and a building opening?
✅ 15 ft
This separation distance is a safety requirement to prevent fire hazards
from a potential leak near building air intakes or openings.
11. If a brazer has not performed a qualified brazing procedure for
more than six months, what is required?
✅ Re-qualification by performing the procedure again
Performance qualifications for brazers remain in effect indefinitely only if
the brazer continues to perform the procedure regularly; a lapse of six
months requires requalification.
12. How should cylinders in a manifold be secured?
✅ Double chains or restraints
NFPA 99 requires at least two restraints (chains, straps, or brackets) per
cylinder to prevent tipping and ensure safety.
13. What is the minimum required pressure for a medical air system at
the outlet?
✅ 50 psi
, A minimum pressure of 50 psi is required at the outlet to ensure adequate
flow for medical devices.
14. What is the required air exchange rate for a manifold room for
medical gas cylinders?
✅ 6 air changes per hour (ACH)
This ventilation rate helps prevent the accumulation of leaked gases in the
event of a cylinder leak.
15. How often must source system alarms be tested?
✅ Annually
NFPA 99 requires annual testing of all source system alarms to ensure they
are functioning correctly.
16. What is the required melting point for components of surface-
mounted medical gas rails?
✅ 1000 degrees F
Rail components must have a high melting point to maintain their integrity
in the event of a fire.
17. What is the required certification for installing a Category 3
medical gas piped distribution system?
✅ ASSE 6010
NFPA 99 requires that all individuals who install, braze, or perform work on
any medical gas piping system—regardless of the facility's risk category—
must hold an ASSE 6010 certification.
18. What is the maximum allowable concentration of oil vapor in
medical air?
