NFPA 99 Exam | Verified Exam Questions and Answers | Latest Updated
Study Material 2026
Question:
According to NFPA 99, the color designation for a WAGD line shall be .
Answer:
Violet/White
Question:
In Level 1 medical gas systems, area alarm panels shall indicate if the pressure in the line in the
are being monitored increases or decreases by percent from the normal line
pressure.
Answer:
20%
Question:
Central supply systems for positive pressure gases shall include one or more relief valves, and
shall have a relief setting that is percent above the normal system operating
pressure, as indicated in Table 5.1.11.
Answer:
50%
Question:
Medical air compressor systems shall consist of the following:
Answer:
Manual shutoff valve AND Pressure relief valve set at 50% above line pressure
Question:
The maximum pipe size for a DN20 medical gas pipe is .
Answer:
7/8 in. O.D.
Question:
The piping systems shall be subjected to a standing vacuum test.
, Answer:
24-Hour
Question:
When brazing, joints shall be continuously purged with to prevent the formation of
copper oxide on the inside surfaces of the joint.
Answer:
Oil-free, Dry
nitrogen NF
Question:
The minimum backfilled cover above the top of the pipe or its enclosure for buried piping
outside of buildings shall be 36 in., except that the minimum cover shall be permitted to be
reduced to where there is no potential for damage from surface loads or surface
conditions.
Answer:
18 inches
Question:
Support gas outlets shall deliver 140 SLPM (5.0 SCFM) with a pressure drop of not more than
gauge and static pressure of 1100 kPa to 1275 kPa (160 psi to 185 psi) gauge.
Answer:
5 psi (35 kPa)
Question:
Misuse of flammable substances: shall not be used on/in oxygen equipment.
Answer:
Oil, grease, or other flammable substances
Question:
The maximum length of a Flexible connector or other than all-metal construction that connect
manifolds to the gas distribution piping shall not exceed in length and shall not
penetrate walls, floors, ceilings, or partitions.
Answer:
5 feet
Study Material 2026
Question:
According to NFPA 99, the color designation for a WAGD line shall be .
Answer:
Violet/White
Question:
In Level 1 medical gas systems, area alarm panels shall indicate if the pressure in the line in the
are being monitored increases or decreases by percent from the normal line
pressure.
Answer:
20%
Question:
Central supply systems for positive pressure gases shall include one or more relief valves, and
shall have a relief setting that is percent above the normal system operating
pressure, as indicated in Table 5.1.11.
Answer:
50%
Question:
Medical air compressor systems shall consist of the following:
Answer:
Manual shutoff valve AND Pressure relief valve set at 50% above line pressure
Question:
The maximum pipe size for a DN20 medical gas pipe is .
Answer:
7/8 in. O.D.
Question:
The piping systems shall be subjected to a standing vacuum test.
, Answer:
24-Hour
Question:
When brazing, joints shall be continuously purged with to prevent the formation of
copper oxide on the inside surfaces of the joint.
Answer:
Oil-free, Dry
nitrogen NF
Question:
The minimum backfilled cover above the top of the pipe or its enclosure for buried piping
outside of buildings shall be 36 in., except that the minimum cover shall be permitted to be
reduced to where there is no potential for damage from surface loads or surface
conditions.
Answer:
18 inches
Question:
Support gas outlets shall deliver 140 SLPM (5.0 SCFM) with a pressure drop of not more than
gauge and static pressure of 1100 kPa to 1275 kPa (160 psi to 185 psi) gauge.
Answer:
5 psi (35 kPa)
Question:
Misuse of flammable substances: shall not be used on/in oxygen equipment.
Answer:
Oil, grease, or other flammable substances
Question:
The maximum length of a Flexible connector or other than all-metal construction that connect
manifolds to the gas distribution piping shall not exceed in length and shall not
penetrate walls, floors, ceilings, or partitions.
Answer:
5 feet
