NFPA-99 (2015) Practice Test Questions with References –
Medical Gas Systems, Piping, Alarms, and Code Compliance|
A+ Graded Rationales Latest Updated 2026
**Under which of these conditions shall the instrument Air Reserve header cylinders be
permitted to be stored with the instrument air compressor?
A) the mechanical equipment room does not contain a boiler.
B) the medical air compressors are in the same room.
C) the only motor-driven machinery in the room is for instrument air equipment.
D) the room is secured with lockable doors.
C) The only motor-driven machinery in the room is for the instrument air equipment
Riser valves are those valves located where?
A) adjacent to the main riser downstream of any zone valve.
B) anywhere in the lateral branches of the piping system.
C) in the mainline adjacent to the base of the riser.
D) in the riser adjacent to the mainline.
D) In the riser adjacent to the main line {5.1.4.4}
When is the initial pressure test conducted by the installer?
A) after blowdown of the distribution piping.
B) after installation of alarm sensors.
C) before blowdown of distribution piping.
D) before installation of station rough in assembly.
A) After blow-down of the distribution piping.{5.1.12.2.3.2(1)}
**In those portions of systems intended to handle oxygen at pressure greater than 350 psi the
inter connecting hose shall not contain what materials?
A) brass.
B) copper
C) polymeric
D) stainless steel
C) Polymeric
The tool shown here allows the installer to mechanically limit the makeup depth of the fitting to
be brazed. Under what condition is this method permitted for the installation of medical gas
piping?
,A) only on final line connectors.
B) only on vacuum systems.
C) where only B cup 5 brazing rod is used
D) where the limited makeup depth is not less than minimum cut depth her ANSI / ASME
recommendations
D) Where the limited makeup depth is not less than minimum cup depth current ANSI\ASME
recommendation {5.1.10.4.6.1}
What is the standard gauge pressure for nitrogen gas service?
A) 15 - 30
B) 50 - 55
C) 162 185
D) it varies with system type.
C) 160 - 185psi {5.1.11}
What is a NFPA 99 requirement for labeling of pipes in medical gas system?
A) color coding
B) fixed label width
C) label shall wrap completely around pipe.
D) reflective label
A) Color coding {5.1.11.1(1)}
A wireless communication device is employed in a medical gas or vacuum warning system. what
type of supervision is required for this device?
A) a visual indicator Shelby located in maintenance officer or engineering department.
B) this device shall be installed at the medical gas or vacuum source.
C) this device shall be located at nurses station.
D) this device will be supervised such that failure communication shall initiate an alarm.
D) This device will be supervised such that failure of communication shall initiate an alarm
{5.1.9.1 (12)}
In a facility where Medical Gas vacuum systems are present and the failure of such equipment
or systems is likely to cause any major injury or death to patients or caregivers this system shall
be designed to meet which category requirements?
A) 1
B) 2
C) 3
D) 4
, A) category 1 {5.1.1.2(2) or 4.1.1}
A faculty is in the planning stages of installing an emergency oxygen service connection (ESOC).
How many feet is the minimum amount of clearance required around this connection?
A) 1 foot
B) 3 feet
C) 5 feet
D) Clearance must be 1-1/2 times the width of the auxiliary.
B) 3 feet {5.1.3.5.15.2(7)}
Wooden rack for cylinder storage may be permitted under which conditions?
A) the wooden must be painted.
B) they are permitted with no set conditions .
C) they must be located in an area with fire suppression system.
D) Wooden racks are no longer permitted
D) Wooden racks are no longer permitted {5.1.3.3.2(11)}
If nonmetallic flexible connectors is being used in a category 1 healthcare faculty to connect to
the manifold to the gas distribution piping what is the maximum length permitted for the
flexible connectors?
A) 2.5 feet
B) 5 feet
C) They shall be no longer necessary
D) the use of flexible connectors is not permitted.
C) They shall be no longer necessary {5.1.10.11.6}
What type of copper tube hanger shall be used for potentially damp locations?
A) carbon steel
B) copper coated
C) Plastic coated or insulated with material that will be non-absorbent or
D) solid copper
C) Plastic coated or insulated with material that will be non-absorbent {5.1.10.11.4.4}
A patient care room is any room of health care faculty where in patients are being intended to
be?
A) either admitted or discharged
B) Examined or treated
C) interviewed
D) sent for x-rays
Medical Gas Systems, Piping, Alarms, and Code Compliance|
A+ Graded Rationales Latest Updated 2026
**Under which of these conditions shall the instrument Air Reserve header cylinders be
permitted to be stored with the instrument air compressor?
A) the mechanical equipment room does not contain a boiler.
B) the medical air compressors are in the same room.
C) the only motor-driven machinery in the room is for instrument air equipment.
D) the room is secured with lockable doors.
C) The only motor-driven machinery in the room is for the instrument air equipment
Riser valves are those valves located where?
A) adjacent to the main riser downstream of any zone valve.
B) anywhere in the lateral branches of the piping system.
C) in the mainline adjacent to the base of the riser.
D) in the riser adjacent to the mainline.
D) In the riser adjacent to the main line {5.1.4.4}
When is the initial pressure test conducted by the installer?
A) after blowdown of the distribution piping.
B) after installation of alarm sensors.
C) before blowdown of distribution piping.
D) before installation of station rough in assembly.
A) After blow-down of the distribution piping.{5.1.12.2.3.2(1)}
**In those portions of systems intended to handle oxygen at pressure greater than 350 psi the
inter connecting hose shall not contain what materials?
A) brass.
B) copper
C) polymeric
D) stainless steel
C) Polymeric
The tool shown here allows the installer to mechanically limit the makeup depth of the fitting to
be brazed. Under what condition is this method permitted for the installation of medical gas
piping?
,A) only on final line connectors.
B) only on vacuum systems.
C) where only B cup 5 brazing rod is used
D) where the limited makeup depth is not less than minimum cut depth her ANSI / ASME
recommendations
D) Where the limited makeup depth is not less than minimum cup depth current ANSI\ASME
recommendation {5.1.10.4.6.1}
What is the standard gauge pressure for nitrogen gas service?
A) 15 - 30
B) 50 - 55
C) 162 185
D) it varies with system type.
C) 160 - 185psi {5.1.11}
What is a NFPA 99 requirement for labeling of pipes in medical gas system?
A) color coding
B) fixed label width
C) label shall wrap completely around pipe.
D) reflective label
A) Color coding {5.1.11.1(1)}
A wireless communication device is employed in a medical gas or vacuum warning system. what
type of supervision is required for this device?
A) a visual indicator Shelby located in maintenance officer or engineering department.
B) this device shall be installed at the medical gas or vacuum source.
C) this device shall be located at nurses station.
D) this device will be supervised such that failure communication shall initiate an alarm.
D) This device will be supervised such that failure of communication shall initiate an alarm
{5.1.9.1 (12)}
In a facility where Medical Gas vacuum systems are present and the failure of such equipment
or systems is likely to cause any major injury or death to patients or caregivers this system shall
be designed to meet which category requirements?
A) 1
B) 2
C) 3
D) 4
, A) category 1 {5.1.1.2(2) or 4.1.1}
A faculty is in the planning stages of installing an emergency oxygen service connection (ESOC).
How many feet is the minimum amount of clearance required around this connection?
A) 1 foot
B) 3 feet
C) 5 feet
D) Clearance must be 1-1/2 times the width of the auxiliary.
B) 3 feet {5.1.3.5.15.2(7)}
Wooden rack for cylinder storage may be permitted under which conditions?
A) the wooden must be painted.
B) they are permitted with no set conditions .
C) they must be located in an area with fire suppression system.
D) Wooden racks are no longer permitted
D) Wooden racks are no longer permitted {5.1.3.3.2(11)}
If nonmetallic flexible connectors is being used in a category 1 healthcare faculty to connect to
the manifold to the gas distribution piping what is the maximum length permitted for the
flexible connectors?
A) 2.5 feet
B) 5 feet
C) They shall be no longer necessary
D) the use of flexible connectors is not permitted.
C) They shall be no longer necessary {5.1.10.11.6}
What type of copper tube hanger shall be used for potentially damp locations?
A) carbon steel
B) copper coated
C) Plastic coated or insulated with material that will be non-absorbent or
D) solid copper
C) Plastic coated or insulated with material that will be non-absorbent {5.1.10.11.4.4}
A patient care room is any room of health care faculty where in patients are being intended to
be?
A) either admitted or discharged
B) Examined or treated
C) interviewed
D) sent for x-rays
