ASSE 6020 Medical Gas Systems Inspector

Which code is the primary U.S. standard that an ASSE 6020 Medical Gas Inspector enforces during inspection of new medical gas piping systems?

• ANFPA 70 National Electrical Code
• BNFPA 99 Health Care Facilities Code
• CNFPA 54 National Fuel Gas Code
• DASME B31.9 Building Services Piping

What is the primary role of an ASSE 6020 Medical Gas Inspector?

• ABraze copper tubing under nitrogen purge
• BPerform the independent final verification before clinical service
• CReview installation work and witness acceptance testing on behalf of the AHJ
• DMaintain source equipment and replace filters

Per NFPA 99, who must perform the final verification of a medical gas system before it is placed in clinical service?

• AThe ASSE 6010 installer who brazed the system
• BThe ASSE 6020 inspector
• CAn ASSE 6030 verifier independent of the installing contractor
• DThe hospital's ASSE 6040 maintenance staff

Which ASTM specification covers seamless copper tube cleaned, capped, and labeled specifically for medical gas service?

• AASTM B819
• BASTM B280
• CASTM B88
• DASTM A53

During an in-progress brazing inspection, the inspector observes no purge gas flowing through the copper tube while joints are being brazed. The correct response is to:

• AAccept the work because purging is optional for joints under 1 inch
• BReject the work and require oxygen-free nitrogen purge during brazing
• CAccept the work if the brazer uses cadmium-free filler
• DAllow the work to continue and verify by visual inspection only

Which standard qualifies a brazer for medical gas piping joints?

• AAWS D1.1 Structural Welding Code
• BASME Boiler and Pressure Vessel Code, Section IX
• CAPI 1104 Pipeline Welding
• DISO 9606 Welder Qualification

Which brazing filler metal family is acceptable for joining copper-to-copper medical gas piping joints?

• ABAg cadmium-bearing silver alloys
• BBCuP copper-phosphorus alloys
• CTin-lead 50/50 solder
• DAluminum-silicon brazing alloys

When the installer brazes copper tube to a bronze valve body, which brazing filler metal must be used?

• ABCuP copper-phosphorus alloy
• BCadmium-free BAg silver brazing alloy with flux
• CCadmium-bearing BAg silver brazing alloy
• DTin-antimony 95/5 solder

Why are cadmium-bearing brazing alloys prohibited for medical gas piping?

• AThey are too expensive for hospital projects
• BThey produce toxic cadmium oxide fumes during brazing
• CThey cannot wet copper effectively
• DThey are incompatible with nitrogen purge

Per NFPA 99 / CGA C-9, what is the correct identification color for medical oxygen piping?

• AYellow
• BGreen
• CBlue
• DBlack

What is the correct CGA C-9 color identification for medical air piping?

• AYellow
• BWhite
• CGray
• DBrown

What is the correct CGA C-9 color identification for medical vacuum piping?

• ABlack
• BWhite
• CBrown
• DGreen

Under NFPA 99, a Level 1 medical gas system is intended for:

• ADental clinics with low-risk procedures
• BOutpatient surgery centers without overnight stay
• CFacilities where loss of system would terminate procedures critical to patient safety
• DLaboratory gas distribution only

An ASSE 6020 inspector reviewing a Level 1 medical oxygen source must confirm the source has at least:

• AA single primary supply
• BA primary, secondary, and reserve supply
• CA primary supply and a reserve only
• DA primary supply and a backup compressor

DISS (Diameter Index Safety System) threaded connections are used on medical gas outlets to:

• AIncrease pressure rating of the outlet
• BPrevent connection of equipment to the wrong gas service
• CAllow universal cross-compatible adapters
• DReduce flow restriction at high demand

Per NFPA 99, the initial pressure test on medical gas piping must be at least:

• AWorking pressure
• B1.5 times working pressure with oil-free dry nitrogen
• CTwice working pressure with shop air
• DAtmospheric pressure for 24 hours

Under NFPA 99, the medical gas standing pressure test must be performed at working pressure for a minimum of:

• A30 minutes
• B2 hours
• C8 hours
• D24 hours

What is the purpose of the cross-connection test during medical gas system acceptance?

• AConfirm that each station outlet delivers the correct gas labeled at that outlet
• BDetect particulate contamination in the gas
• CVerify nitrogen purge during brazing
• DMeasure compressor flow performance

During the high-flow particulate purge, the verifier expels gas through each outlet onto a white cloth. The inspector witnesses the test. The test passes only when:

• AThe cloth shows visible discoloration
• BThe cloth remains free of visible particulate
• CGas pressure remains constant
• DThe cloth is wet from condensation

Per NFPA 99, the maximum allowable dew point for medical air at 50 psig is:

• A+32°F
• B0°F
• C-4°F
• D-40°F

Per NFPA 99, the maximum allowable carbon monoxide concentration in medical air is:

• A2 ppm
• B10 ppm
• C25 ppm
• D50 ppm

Per NFPA 99, the maximum allowable carbon dioxide concentration in medical air is:

• A100 ppm
• B500 ppm
• C1000 ppm
• D5000 ppm

Master alarms in a medical gas system must annunciate at a minimum of:

• AOne location only
• BTwo separate locations
• CThree separate locations
• DEvery nursing station

Area alarms in a medical gas system monitor:

• ASource equipment liquid level
• BPressure in the gas line serving a specific patient-care area
• CAtmospheric oxygen concentration in the room
• DCombustible gas leaks in the facility

When inspecting a medical air compressor system, which intake location is acceptable?

• AAdjacent to an emergency generator exhaust
• BInside a mechanical room with combustion equipment
• COutdoors away from contamination sources
• DConnected to the building HVAC return

Inspection of bulk liquid oxygen siting falls primarily under which code in addition to NFPA 99?

• ANFPA 13 Sprinkler Systems
• BNFPA 55 Compressed Gases and Cryogenic Fluids
• CNFPA 70 National Electrical Code
• DNFPA 101 Life Safety Code

What is WAGD?

• AWater-cooled anesthesia gas dryer
• BWaste anesthetic gas disposal (scavenging)
• CWall-mounted analog gauge for delivery
• DWet air gauge device

Zone valves on a medical gas system must be:

• AHidden behind permanent walls
• BAccessible at all times for emergency shutoff
• CLocated only in the boiler room
• DOperable only with a special tool

Per NFPA 99, the recommended nitrogen purge flow rate during brazing is:

• A0.5 to 1 SCFH
• B5 to 15 SCFH
• C50 to 100 SCFH
• D300 SCFH

Brazing proficiency for medical gas installers must be re-verified at a maximum interval of:

• A1 month
• B6 months
• C1 year
• D3 years

During pre-construction submittal review, the ASSE 6020 inspector should verify that the design includes:

• AListed approved materials only (no field-substitution)
• BVendor-suggested alternatives without prior approval
• CGeneric materials of any manufacturer
• DMaterials matching the lowest bid

An ASSE 6020 inspector finds that the installer's brazing log records the same brazer ID for joints made on dates the brazer was not on site. The correct response is to:

• AAccept the log because brazer IDs are advisory
• BRequire the contractor to investigate and resubmit; reject affected joints if fraud is su…
• CAccept the joints if pressure test passed
• DForward the issue to the verifier without action

Which document must the installer produce after completing the system, and which the inspector must verify before AHJ acceptance?

• AAs-built drawings showing actual piping routes and valve locations
• BA purchase order list
• CA union membership roster
• DA facility insurance certificate

An ASSE 6020 inspector observes the installer reusing ASTM B819 copper tube that was previously stored uncapped on an open jobsite shelf for several months. The correct response is:

• AAllow the tube to be installed as-is
• BReject the tube; medical gas tube must remain capped and cleaned per oxygen service
• CAllow installation if both ends are wiped before brazing
• DAllow installation if the tube is purged twice as long during brazing

Which gas service is associated with the color blue under CGA C-9 / NFPA 99 labeling?

• AMedical air
• BNitrous oxide
• CHelium
• DCarbon dioxide

Which gas service is associated with the color black under CGA C-9 / NFPA 99 labeling?

• ANitrogen (NF)
• BMedical air
• CMedical vacuum
• DOxygen

Which gas service is associated with the color gray under CGA C-9 / NFPA 99 labeling?

• AHelium
• BCarbon dioxide
• CMedical air
• DNitrogen

An inspector reviewing a Level 2 medical gas system can expect which key difference from a Level 1 system?

• ALevel 2 requires more source redundancy than Level 1
• BLevel 2 serves areas where system failure would NOT terminate life-critical procedures
• CLevel 2 does not require any final verification
• DLevel 2 allows ASTM B280 ACR tube

An ASSE 6020 inspector visits the site and finds the installer using a propane torch on copper-to-copper joints. The correct response is to:

• AAccept the work because propane melts BCuP filler
• BReject and require oxy-acetylene (or oxy-fuel capable of reaching brazing temperatures)
• CAccept after verifying the brazer's ID
• DAccept only if the joint is later pressure tested

The installer's brazing log must include, at minimum:

• ABrazer ID, date, joint number, filler metal used, and purge confirmation
• BBrazer's home address and union number
• CBid price for each joint
• DPatient names served by each joint

Quick-connect outlet adapters in medical gas systems are gas-specific by:

• AColor paint only
• BMechanical keying (pin position and shape)
• CVoluntary labeling by the installer
• DPressure rating only

If the installer's initial pressure test passes but a leak is found during the 24-hour standing pressure test, the inspector should:

• AAccept the system if leak is below 5 percent per day
• BRequire the leak to be located and repaired, then re-test
• CAccept if pressure rises slightly due to temperature
• DForward to the verifier without action

Which document does the ASSE 6030 verifier deliver to the 6020 inspector and AHJ at the end of the verification?

• AA facility marketing brochure
• BA formal verifier's report listing every test, result, and pass/fail
• CAn installer payroll record
• DA manufacturer service bulletin

Source/main and riser valves on medical gas systems must be located:

• AWhere only emergency responders can reach them
• BIn accessible locations and labeled for the gas served and area controlled
• CInside locked rooms with no signage
• DAbove 8-foot ceilings to prevent tampering

Inspecting an oxygen manifold installation, the inspector confirms the manifold is sized so that:

• AThe reserve supplies at least one average day of system demand at peak
• BEach cylinder supplies one hour of total demand
• CDemand never exceeds 50 percent of supply
• DAll cylinders run full time without changeover

Inspecting a duplex medical air compressor system, the inspector confirms that:

• ABoth compressors are sized so that either one can meet peak demand
• BOnly the larger compressor must meet peak demand
• CCompressors share peak demand; neither can stand alone
• DA single compressor is acceptable if backup cylinders are present

Which test confirms that the gas piped to an oxygen outlet is in fact oxygen and not nitrogen, nitrous oxide, or air?

• AStanding pressure test
• BParticulate purge
• CCross-connection test combined with piping purity test
• DBrazing visual inspection