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What does WAGD refer to in a medical gas system?

Wall-mounted Argon Gas Detector

Waste Anesthetic Gas Disposal

Wet Acetylene Gas Distribution

Welded Aluminum Gas Duct

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2026 Statistics

Key Facts: ASSE 6010 Exam

100

Written Exam Questions

ASSE Series 6000

70%

Passing Score

ASSE Series 6000

32 hrs

Minimum Training

ASSE 6050 course

4 years

Required Experience

ASSE 6010 eligibility

6 months

Brazing Reverification

NFPA 99 / ASSE 6010

3 years

Certification Validity

ASSE recertification policy

ASSE 6010 candidates must complete a minimum 32-hour medical gas installer course, document 4 years of piping experience, pass a 100-question written exam at 70 percent, and pass a practical brazed-coupon examination per ASME Section IX. Certification is valid for 3 years, and brazing proficiency must be reverified every 6 months to continue brazing medical gas joints. Effective preparation focuses on NFPA 99 Chapter 5 system categories, nitrogen-purged brazing technique with cadmium-free fillers, source redundancy, alarms, gas-specific identification, and the full verification test sequence.

Sample ASSE 6010 Practice Questions

Try these sample questions to test your ASSE 6010 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which code is the primary standard governing medical gas and vacuum piping system installation in U.S. health care facilities?

A.NFPA 70 National Electrical Code

B.NFPA 99 Health Care Facilities Code

C.NFPA 54 National Fuel Gas Code

D.ASME B31.1 Power Piping Code

Explanation: NFPA 99, Health Care Facilities Code, Chapter 5 (Gas and Vacuum Systems) is the primary U.S. standard for medical gas and vacuum piping installation, materials, brazing, testing, and verification. ASSE 6010 installers must work to NFPA 99 requirements.

2Which ASTM standard specifies seamless copper tube specifically cleaned, capped, and labeled for medical gas service?

A.ASTM B280 ACR refrigeration tube

B.ASTM B88 water service tube

C.ASTM B819 medical gas tube

D.ASTM A53 black steel pipe

Explanation: ASTM B819 covers seamless copper tube for medical gas systems. Tube is degreased, cleaned to oxygen-service levels, capped on both ends, and marked OXY, MED, OXY/MED, ACR/MED, or similar. ASTM B280 ACR tube is NOT acceptable for medical gas piping under NFPA 99.

3During brazing of medical gas copper tubing, an inert purge gas is flowed through the pipe to prevent oxide scale formation. Which gas is required?

A.Oxygen-free nitrogen (nitrogen NF)

B.Argon welding grade

C.Carbon dioxide beverage grade

D.Compressed shop air

Explanation: NFPA 99 requires oxygen-free nitrogen (nitrogen NF) as the purge gas during brazing of medical gas piping. The purge prevents formation of copper oxide (cupric/cuprous oxide) scale inside the tube, which can flake off and contaminate the gas downstream. Shop air contains oxygen and is prohibited.

4Which brazing filler metal family is acceptable for joining copper-to-copper medical gas piping joints?

A.BAg cadmium-bearing silver alloys

B.BCuP copper-phosphorus alloys

C.Tin-antimony 95/5 solder

D.Lead-tin 50/50 solder

Explanation: BCuP brazing filler metals (copper-phosphorus alloys, AWS A5.8) are acceptable for copper-to-copper medical gas joints. The phosphorus acts as a self-fluxing agent on copper, so no flux is required. Soft solders are never permitted on medical gas piping.

5When brazing copper tube to a dissimilar metal (such as a brass or bronze valve body) in medical gas service, which filler metal family is required?

A.BCuP copper-phosphorus alloy

B.BAg silver brazing alloy that is cadmium-free with flux

C.Tin-silver 96/4 solder

D.Aluminum brazing alloy

Explanation: BCuP alloys form brittle phosphides on ferrous and high-nickel bronze alloys, so they must NOT be used on dissimilar metals. BAg silver brazing filler metals — cadmium-free per AWS A5.8 (such as BAg-5, BAg-7, BAg-24) — are used with flux for copper-to-brass or copper-to-bronze joints in medical gas piping.

6Why are cadmium-bearing brazing alloys prohibited for medical gas piping?

A.They have a higher cost than cadmium-free alloys

B.They produce toxic cadmium oxide fumes during brazing

C.They do not flow well at copper brazing temperatures

D.They cannot be used with nitrogen purge

Explanation: Cadmium-bearing silver brazing alloys release toxic cadmium oxide fumes when heated, posing serious health risks to the brazer and bystanders. NFPA 99 and OSHA effectively require cadmium-free BAg alloys for medical gas brazing.

7What is the typical nitrogen purge flow rate during brazing of medical gas copper piping?

A.1 to 3 SCFH

B.5 to 15 SCFH

C.25 to 40 SCFH

D.50 to 100 SCFH

Explanation: A low, steady purge of about 5 to 15 SCFH of oxygen-free nitrogen is industry standard during brazing. Flow must be high enough to displace oxygen from the joint area but low enough that pressure does not blow molten filler out of the capillary gap.

8Which gas color marking is used on labels and outlets for oxygen in U.S. medical gas systems per NFPA 99/CGA C-9?

A.Yellow

B.Black on white background

C.Green

D.Blue

Explanation: Per CGA C-9 and NFPA 99, oxygen is identified by GREEN in the U.S. (white is the ISO international color for oxygen). Yellow is medical air, blue is nitrous oxide, white is medical vacuum, and black is nitrogen.

9What is the standard U.S. identification color for medical air in NFPA 99 piping systems?

A.Green

B.Yellow

C.Blue

D.White

Explanation: Medical air is identified by YELLOW in U.S. NFPA 99/CGA C-9 color coding. It is delivered at approximately 50–55 psig at the outlet for breathing-quality air to patient care areas.

10Which Diameter Index Safety System (DISS) feature prevents accidental cross-connection of gas-specific fittings?

A.Color-coded paint on the body

B.Non-interchangeable thread and shoulder diameters keyed per gas service

C.A locking screw that requires a special key

D.A pressure regulator built into the fitting

Explanation: DISS connections (CGA V-5) use unique non-interchangeable thread diameters and shoulder geometries for each gas, so an oxygen DISS hose cannot mate with a nitrous oxide DISS outlet. This is a physical, gas-specific keying system.

About the ASSE 6010 Exam

ASSE 6010 is the national certification for Medical Gas Systems Installers who braze and install medical gas and vacuum piping in U.S. health care facilities per NFPA 99 Chapter 5. The exam covers piping materials (ASTM B819 copper), oxygen-service cleanliness, brazing with BCuP and cadmium-free BAg filler metals under nitrogen purge per ASME Section IX, source equipment (bulk oxygen, duplex medical air compressors, vacuum, WAGD), alarms, gas-specific identification and DISS outlets, valves, and the installer-side pressure, cross-connection, and purge tests that precede independent ASSE 6030 verification.

Assessment

100-question written exam plus a practical brazed-coupon examination per ASME Section IX / NFPA 99

Time Limit

Approximately 3 hours written plus practical brazing time

Passing Score

70%

Exam Fee

$300-500 USD (ASSE International / IAPMO)

ASSE 6010 Exam Content Outline

20%

NFPA 99 Chapter 5 and System Categories

Level 1, 2, and 3 medical gas and vacuum systems, source equipment redundancy, AHJ acceptance, and operational requirements for the responsible authority.

15%

Piping Materials and Storage

ASTM B819 medical gas tube, Type K and Type L copper, prohibition of ASTM B280 ACR tube, oxygen-service cleanliness per CGA G-4.1 / ASTM G93, capped storage, and contamination control.

25%

Brazing Procedures and Qualification

BCuP copper-phosphorus filler metals for copper-to-copper joints, cadmium-free BAg filler metals for dissimilar metals, AWS A5.8 specs, joint clearance and capillary action, oxygen-free nitrogen purge at 5-15 SCFH, and brazer qualification per ASME Section IX.

15%

Source Equipment, Alarms, and Valves

Bulk oxygen siting per NFPA 55, cylinder manifolds, duplex medical air compressors and intake location, medical-surgical vacuum, WAGD, master and area alarms, EOSC, source/zone/master/riser ball valves, and lockable shutoff.

10%

Identification, Labeling, and Outlets

CGA C-9 gas color coding (oxygen green, nitrous oxide blue, medical air yellow, vacuum white, nitrogen black, CO2 gray), NFPA 99 pipe labeling, DISS noninterchangeable threads, and quick-connect keyed outlets.

15%

Testing, Verification, and Documentation

Initial pressure test at 1.5x working pressure with oil-free dry nitrogen, cross-connection test, particulate purge with white-cloth verification, 24-hour standing pressure test, medical air purity tests (dew point, CO, CO2), brazing logs, as-built drawings, and independent ASSE 6030 verification before clinical service.

How to Pass the ASSE 6010 Exam

What You Need to Know

Passing score: 70%
Assessment: 100-question written exam plus a practical brazed-coupon examination per ASME Section IX / NFPA 99
Time limit: Approximately 3 hours written plus practical brazing time
Exam fee: $300-500 USD

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ASSE 6010 Study Tips from Top Performers

1Memorize the NFPA 99/CGA C-9 gas colors cold: oxygen green, nitrous oxide blue, medical air yellow, medical vacuum white, nitrogen black, CO2 gray, helium brown — these appear on multiple questions.

2Learn which brazing filler goes where: BCuP for copper-to-copper (self-fluxing), cadmium-free BAg with flux for copper-to-dissimilar metal, NEVER cadmium-bearing silver alloy on medical gas.

3Drill the verification test sequence: (1) initial pressure 1.5x working with nitrogen, (2) cross-connection, (3) particulate purge, (4) 24-hour standing pressure, (5) source/outlet/purity tests by the independent ASSE 6030 verifier.

4Know the NFPA 99 system levels: Level 1 (life support, full redundancy), Level 2 (non-life-threatening), Level 3 (dental, low risk).

5Memorize key numbers: 70% pass, 100 written questions, 32 hours minimum training, 4 years experience, 6-month brazing reverification, 3-year cert cycle.

6Know the medical air purity limits: dew point -4°F max at 50 psig, CO 10 ppm max, CO2 500 ppm max — these appear on the purity question almost every exam cycle.

7Understand 'why' each rule exists. The exam rewards installers who can explain that nitrogen purge prevents oxide scale, cadmium-free silver protects the brazer from toxic fumes, DISS prevents wrong-gas connections, and standing pressure tests find tiny leaks the initial test misses.

Frequently Asked Questions

What does an ASSE 6010 Medical Gas Systems Installer do?

An ASSE 6010 installer brazes and installs medical gas and vacuum piping in U.S. health care facilities per NFPA 99 Chapter 5. The installer works to approved drawings, brazes ASTM B819 copper joints under an oxygen-free nitrogen purge using BCuP or cadmium-free BAg filler metals, logs every joint to a qualified brazer, and performs the installer-side pressure, cross-connection, and purge tests before handing the system to an independent ASSE 6030 verifier for final acceptance.

What are the prerequisites to sit for the ASSE 6010 exam?

ASSE 6010 candidates must document at least 4 years of piping work experience as a licensed plumber, pipefitter, or equivalent, AND complete a minimum 32-hour medical gas installer course delivered by an ASSE 6050-certified instructor. State licensing requirements may add more hours.

How many questions are on the ASSE 6010 exam and what is the passing score?

The ASSE 6010 examination has two parts: a 100-question written exam (70% passing) and a practical brazing examination in which the candidate brazes a copper test coupon under observation per ASME Section IX. Both parts must be passed to earn certification.

Why is an oxygen-free nitrogen purge required during medical gas brazing?

Without a nitrogen purge, oxygen inside the copper tube reacts with hot copper at brazing temperatures (about 1190°F to 1480°F for BCuP fillers) and forms copper oxide scale on the interior surface. The scale flakes off into the gas stream over time and can contaminate the gas and damage downstream medical devices. NFPA 99 requires oxygen-free nitrogen NF purge during all medical gas brazing.

When are cadmium-free BAg silver brazing alloys required instead of BCuP?

BCuP copper-phosphorus alloys are self-fluxing on copper-to-copper joints but they form brittle phosphides on bronze and brass. When brazing copper to a dissimilar metal — such as a bronze valve body — a cadmium-free BAg silver brazing alloy with flux is required. Cadmium-bearing silver alloys are prohibited on medical gas work because they produce toxic cadmium oxide fumes.

How often does an ASSE 6010 installer have to requalify brazing?

Brazing proficiency must be reverified every 6 months. The installer brazes a test coupon under qualified conditions; the coupon is sectioned and visually examined for full capillary fill and absence of voids per ASME Section IX. Certification itself is renewed every 3 years through continuing education.

What is the difference between ASSE 6010, 6020, 6030, and 6040?

ASSE 6010 is the Installer (brazes the piping). ASSE 6020 is the Inspector (reviews installation work). ASSE 6030 is the independent Verifier (performs final verification testing required by NFPA 99 before clinical service). ASSE 6040 is the Maintenance Personnel certification for staff who service systems already in service. NFPA 99 requires the 6030 verifier to be independent of the installation contractor on the same project.