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ASSE 6010 practice questions

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Question 1Cross-Connection Control Principles and Backflow Theory

In cross-connection control terminology, what is a cross-connection?

  1. A meter installed between the main and the building
  2. A pipe joint installed below a flood-level rim
  3. Potable piping connected to a nonpotable source Correct answer.
  4. A valve that closes when supply pressure drops

Explanation

A cross-connection is any actual or potential link between a potable water system and any source of nonpotable fluid or substance. The concern is that a reversal of flow could move that nonpotable material into the drinking water piping.

Question 2Cross-Connection Control Principles and Backflow Theory

Which statement best defines backflow?

  1. Reverse flow of water or other liquid into potable piping Correct answer.
  2. Discharge from a relief valve to a floor drain
  3. The normal forward movement of water through a service meter
  4. Loss of pressure caused by friction in a long pipe run

Explanation

Backflow is the unwanted reversal of flow of water or other substances from any source into a potable water system. It occurs only when a cross-connection exists and a driving force, either backsiphonage or backpressure, develops.

Question 3Cross-Connection Control Principles and Backflow Theory

Backsiphonage occurs under which condition?

  1. Supply pressure drops below atmospheric Correct answer.
  2. A booster pump raises downstream pressure
  3. A check valve fails to seat when closed
  4. Water is heated in a closed system and expands

Explanation

Backsiphonage is backflow driven by a negative or sub-atmospheric pressure in the supply piping. A break, heavy draft, or undersized main can create that vacuum, and any connection to a nonpotable source then draws material into the system.

Question 4Cross-Connection Control Principles and Backflow Theory

Backpressure backflow is created when which condition exists?

  1. A pump takes suction from the main
  2. A fire hydrant is opened nearby
  3. A main break lowers system pressure
  4. Downstream pressure is greater than supply pressure Correct answer.

Explanation

Backpressure results when the pressure on the downstream side of a connection exceeds the pressure of the potable supply, pushing nonpotable material upstream. Pumps, boilers, elevated tanks, and thermal expansion are common sources of that higher downstream pressure.

Question 5Cross-Connection Control Principles and Backflow Theory

Which method provides the highest degree of protection against both backsiphonage and backpressure?

  1. A dual check valve
  2. A hose bibb vacuum breaker
  3. An atmospheric vacuum breaker
  4. A properly sized air gap Correct answer.

Explanation

An air gap is a physical separation between the supply outlet and the flood-level rim of the receptor, so there is no continuous path for backflow. Because it has no mechanical parts and no connection at all, it protects against both backsiphonage and backpressure.

Question 6Cross-Connection Control Principles and Backflow Theory

In cross-connection control, a contaminant is a substance that:

  1. poses a health hazard if introduced into drinking water Correct answer.
  2. can be removed by a sediment filter
  3. affects only color, taste, or odor
  4. occurs only in irrigation systems

Explanation

A contaminant is a substance that creates a health hazard, such as a toxic chemical or disease-causing organism. Substances that only degrade appearance or taste without harming health are classified as pollutants, a lower degree of hazard.

Question 7Cross-Connection Control Principles and Backflow Theory

What is the fundamental goal of a cross-connection control program?

  1. Ensure adequate pressure at the farthest fixture
  2. Protect the potable supply from contamination or pollution Correct answer.
  3. Reduce water bills by limiting irrigation
  4. Verify meter accuracy on a schedule

Explanation

A cross-connection control program exists to keep nonpotable material out of the drinking water system, protecting public health. It does this by finding cross-connections, evaluating the degree of hazard, and requiring protection and periodic testing.

Question 8Cross-Connection Control Principles and Backflow Theory

A worker submerges the end of a hose connected to a hose bibb into a bucket of herbicide. Which feature of this setup creates the greatest risk of backsiphonage into the building supply?

  1. The bibb is 3 feet above the floor
  2. The hose end is below the flood-level rim of a nonpotable liquid Correct answer.
  3. The bibb has an integral vacuum breaker
  4. The hose is 50 feet long

Explanation

A submerged or below-rim outlet places a nonpotable source in direct contact with the supply piping, completing the cross-connection. If main pressure drops, the herbicide can be drawn back through the hose into the building system.

Question 9Cross-Connection Control Principles and Backflow Theory

An atmospheric vacuum breaker must be installed at least how far above the highest downstream outlet it protects?

  1. 36 inches
  2. 12 inches
  3. 30 inches
  4. 6 inches Correct answer.

Explanation

The critical level of an atmospheric vacuum breaker must be at least 6 inches above the highest point of downstream piping or outlet it serves. That elevation keeps the air-inlet and disc clear so the device can admit air when supply pressure drops.

Question 10Cross-Connection Control Principles and Backflow Theory

Which limitation applies to an atmospheric vacuum breaker?

  1. It cannot be installed on an irrigation system
  2. It must be installed below the highest outlet
  3. It may be used to protect against backpressure
  4. It must not be subjected to continuous pressure Correct answer.

Explanation

An atmospheric vacuum breaker has no mechanism to hold against sustained line pressure, so it must not be subjected to continuous pressure. That is why no shutoff valve is permitted downstream of the device.

Question 11Cross-Connection Control Principles and Backflow Theory

A reduced pressure principle backflow prevention assembly is designed to protect against:

  1. backsiphonage only
  2. neither unless a downstream check is added
  3. both backsiphonage and backpressure at a high hazard Correct answer.
  4. backpressure only

Explanation

The reduced pressure principle assembly has two independently acting check valves separated by a zone whose pressure is kept below supply pressure by a relief valve. That arrangement makes it suitable for high-hazard connections subject to either backsiphonage or backpressure.

Question 12Cross-Connection Control Principles and Backflow Theory

A double check valve assembly is properly applied only where:

  1. the degree of hazard is low and no health hazard exists Correct answer.
  2. the assembly is tested every five years
  3. an air gap is aesthetically unacceptable
  4. a high health hazard exists

Explanation

A double check valve assembly relies on two check valves and has no relief or venting feature, so it is limited to low-hazard protection against pollutants. Where a health hazard exists, an assembly that discharges or separates, such as a reduced pressure principle assembly or an air gap, is required.

Question 13Cross-Connection Control Principles and Backflow Theory

A lawn irrigation system must be protected by a device that will remain under continuous main-line pressure and will never be subject to backpressure. Which device is appropriate?

  1. A barometric loop
  2. A pressure vacuum breaker Correct answer.
  3. A hose bibb vacuum breaker
  4. An atmospheric vacuum breaker

Explanation

A pressure vacuum breaker is designed to hold against continuous supply pressure while still protecting against backsiphonage. Because the irrigation main can be pressurized for long periods, the atmospheric type would be unsuitable.

Question 14Cross-Connection Control Principles and Backflow Theory

Water is discharging continuously from the relief valve of a reduced pressure principle assembly. Which condition most likely explains this?

  1. The supply pressure is unusually high
  2. The downstream shutoff valve is fully open
  3. The second check is stuck closed
  4. The first check is fouled open, admitting supply pressure to the zone Correct answer.

Explanation

The relief valve stays closed only while the pressure in the zone between the checks is sufficiently lower than supply pressure. If the first check leaks or is held open, zone pressure rises toward supply pressure and the relief valve opens and stays open.

Question 15Cross-Connection Control Principles and Backflow Theory

A barometric loop provides protection against:

  1. backsiphonage only, using a 35-foot rise in the piping Correct answer.
  2. both backpressure and backsiphonage
  3. neither, because it has no moving parts
  4. backpressure only, at any hazard level

Explanation

A barometric loop rises about 35 feet, which is more than the height a perfect vacuum can lift water at sea level. It therefore prevents backsiphonage without mechanical parts, but it cannot stop backflow caused by downstream pressure.

Question 16Cross-Connection Control Principles and Backflow Theory

A supply pipe with an effective opening of 3/4 inch discharges freely into a tank. What is the minimum required air gap?

  1. 1-1/4 inches
  2. 1 inch
  3. 3/4 inch
  4. 1-1/2 inches Correct answer.

Explanation

The minimum air gap is twice the diameter of the effective opening, and never less than 1 inch. For a 3/4-inch opening, twice the diameter is 1-1/2 inches.

Question 17Cross-Connection Control Principles and Backflow Theory

How does a backflow prevention assembly differ from a backflow prevention device?

  1. It is limited to low-hazard applications
  2. It does not require periodic testing
  3. It is always installed below grade
  4. It includes test cocks and shutoff valves and can be tested in place Correct answer.

Explanation

An assembly is manufactured with test cocks and shutoff valves so its checks and relief valve can be verified in the field. A device lacks those features and cannot be field tested the same way.

Question 18Cross-Connection Control Principles and Backflow Theory

A check valve type backflow preventer is installed on the service line of a building that has a storage water heater. What condition should the designer anticipate?

  1. Backsiphonage from the water heater into the main
  2. Loss of pressure throughout the building
  3. Thermal expansion that raises pressure in the closed system Correct answer.
  4. Freezing of the assembly in summer

Explanation

A backflow preventer with a check valve closes the system, so water heated in the tank expands against fixed boundaries. The resulting pressure rise must be relieved, typically with a thermal expansion tank or a listed relief device.

Question 19Cross-Connection Control Principles and Backflow Theory

Which event most commonly produces the low pressure that causes backsiphonage in a building?

  1. A main break or heavy fire flow lowering main pressure Correct answer.
  2. A check valve failing to seat
  3. A booster pump raising downstream pressure
  4. A relief valve discharging to a drain

Explanation

Backsiphonage needs a negative pressure in the supply, and the usual causes are main breaks, heavy fire-fighting drafts, and other large withdrawals. When main pressure falls below atmospheric, a submerged or connected nonpotable source can be drawn in.

Question 20Cross-Connection Control Principles and Backflow Theory

A water purveyor requires a containment assembly at the meter for a car wash. The purpose of this assembly is to:

  1. eliminate the need for internal isolation devices
  2. protect fixtures inside the building from backflow
  3. measure the volume of water delivered
  4. protect the public main from contamination anywhere on the premises Correct answer.

Explanation

Containment protection is placed at the service connection so that anything originating on the property is kept out of the public distribution system. It does not replace internal isolation protection for hazards within the building.

Question 21Cross-Connection Control Principles and Backflow Theory

A reduced pressure principle assembly discharges from its relief valve when:

  1. the supply pressure rises above 80 psi
  2. the downstream pressure drops to zero
  3. the pressure differential across the first check drops to about 2 psi Correct answer.
  4. the second check valve opens

Explanation

The relief valve is held closed by the differential maintained across the first check, normally on the order of 10 psi. If that differential falls to roughly 2 psi, the relief valve opens and dumps the zone to atmosphere to keep the supply isolated.

Question 22Cross-Connection Control Principles and Backflow Theory

In which installation would a pressure vacuum breaker be unacceptable, so that a reduced pressure principle assembly is required?

  1. A drinking fountain with an integral air gap
  2. A laboratory faucet with a hose-end vacuum breaker
  3. A boiler make-up line that can be pressurized above supply pressure Correct answer.
  4. A sprinkler zone with pop-up heads on a slope

Explanation

A pressure vacuum breaker protects against backsiphonage but is not designed to hold against downstream backpressure. Where a boiler can develop pressure above the supply pressure, an assembly rated for both conditions, such as a reduced pressure principle assembly, is needed.

Question 23Cross-Connection Control Principles and Backflow Theory

A reduced pressure principle assembly is installed in a below-grade vault with no drain. What is the primary concern with this installation?

  1. The assembly will freeze in winter
  2. Flooding submerges the relief port, defeating discharge to atmosphere Correct answer.
  3. The test cocks will be inaccessible
  4. The relief valve opens more often at lower elevation

Explanation

The protective action of the assembly depends on the relief valve being able to dump to open air. If the vault fills with water, the relief port is submerged and the assembly no longer isolates the supply, and the unit may be exposed to the very hazard it is meant to stop.

Question 24Cross-Connection Control Principles and Backflow Theory

A plating tank is filled through a pipe whose open end is submerged, and a single swing check valve is installed in the supply line. Why is this arrangement unacceptable?

  1. The check valve cannot be fitted with a sight glass
  2. The check valve will increase the flow rate above design
  3. The tank should be filled only from the top
  4. A single check valve is not an approved backflow preventer and can foul or leak unnoticed Correct answer.

Explanation

An approved backflow preventer must provide reliable protection that can be verified, and a lone swing check is not such a device. Scale, debris, or a worn seat can hold a check open, and there is no test cock or relief feature to reveal the failure before contamination occurs.

Question 25Cross-Connection Control Principles and Backflow Theory

Two buildings share a private water main fed from the public main through a single containment assembly at the meter. What risk remains despite the containment protection?

  1. Backflow from one building can reach the other through the private main Correct answer.
  2. The public main is unprotected during a break
  3. Each building must be metered separately
  4. The containment assembly cannot be tested

Explanation

Containment protects the public distribution system but does nothing about hazards traveling within the private piping. A cross-connection in one building can be pushed or drawn into the other building on the shared main, so internal isolation protection is also needed.

Question 26Cross-Connection Control Principles and Backflow Theory

A cross-connection is best defined as:

  1. A valve that permits water to pass in one direction only
  2. The point where a water meter is set on a building service line
  3. A fitting used to join potable water piping to a fixture drain of a different diameter
  4. Any actual or potential link between potable water and a nonpotable source Correct answer.

Explanation

A cross-connection is any actual or potential physical link between a potable supply and a source of pollution or contamination. The word 'potential' matters: the connection does not have to be flowing or submerged today to be regulated. Each such link must be eliminated or protected by an approved method.

Question 27Cross-Connection Control Principles and Backflow Theory

Backflow is the term used to describe:

  1. The pressure drop in a main caused by a large fire flow demand
  2. The normal forward movement of water from the meter to the fixtures
  3. The unwanted reversal of water flow from its intended direction Correct answer.
  4. The draining of a water heater through its relief valve

Explanation

Backflow is any flow of water or other substance opposite to the intended direction in a piping system. It is produced either by backpressure or by backsiphonage, and it can only occur where a cross-connection exists. Preventing reversal is the entire purpose of a cross-connection control program.

Question 28Cross-Connection Control Principles and Backflow Theory

An air gap is considered the most reliable form of backflow protection because it:

  1. Contains a moving check member that closes automatically under reverse flow
  2. Relies on the velocity of the discharge to keep the opening clear
  3. Provides a physical separation that works against both backsiphonage and backpressure Correct answer.
  4. May be installed below the flood level rim of the receiving fixture

Explanation

An air gap relies on an unobstructed physical separation between the supply outlet and the flood level rim of the receptor. Because there is no mechanical linkage, it protects against backsiphonage and backpressure equally and cannot fail in the open position. Mechanical devices, by contrast, depend on moving parts that can foul or stick.

Question 29Cross-Connection Control Principles and Backflow Theory

Backsiphonage occurs when:

  1. A check valve fails and allows flow in the reverse direction
  2. A downstream pump raises the pressure above the supply pressure
  3. Negative pressure in the supply piping draws nonpotable water into the system Correct answer.
  4. Water expands thermally and pushes back through the service line

Explanation

Backsiphonage is reverse flow caused by a pressure in the supply piping that drops below atmospheric, creating a partial vacuum. The vacuum pulls nonpotable liquid through a cross-connection into the potable piping. Typical triggers include main breaks, heavy fire flow demand, and nearby high-volume use.

Question 30Cross-Connection Control Principles and Backflow Theory

A custodial sink is fed by a chemical dispenser whose injection pump can develop 60 psi, more than the incoming main pressure during peak demand. The result is cleaner being forced into the building's potable piping. This is an example of:

  1. Backsiphonage
  2. A barometric loop failure
  3. Backpressure Correct answer.
  4. Thermal expansion

Explanation

Backpressure occurs when the pressure on the downstream, nonpotable side exceeds the pressure in the potable supply, forcing water in reverse. A chemical feed pump is a classic source of that higher downstream pressure. Protection against backpressure requires an assembly rated for it, such as a reduced pressure principle assembly.

Question 31Cross-Connection Control Principles and Backflow Theory

A threaded hose bibb in a janitor's closet is used with a portable hose to fill buckets. Which protection is appropriate at that outlet?

  1. A reduced pressure principle assembly
  2. A hose bibb vacuum breaker Correct answer.
  3. A double check valve assembly
  4. A pressure vacuum breaker on the branch line upstream

Explanation

A hose bibb vacuum breaker is the device intended for a threaded hose connection on a sill cock or janitor's sink. It prevents backsiphonage through a submerged or dangling hose end. It is not designed for continuous pressure or for backpressure protection.

Question 32Cross-Connection Control Principles and Backflow Theory

A spill-resistant vacuum breaker is often chosen instead of a standard atmospheric vacuum breaker mainly because it:

  1. May remain under continuous supply pressure and spills less water at startup Correct answer.
  2. May be installed in a below-grade pit that is subject to occasional flooding
  3. Contains no check valve and uses only one moving member
  4. Protects against backpressure as well as against backsiphonage

Explanation

The spill-resistant vacuum breaker adds a check valve ahead of the air inlet so the device can be used where the supply is under continuous pressure and does not discharge for every small pressure fluctuation. It still protects against backsiphonage only. It is not intended for flooded vaults or for backpressure.

Question 33Cross-Connection Control Principles and Backflow Theory

Which assembly is typically installed on the supply to an automatic fire sprinkler system to protect the potable main and still alarm if water flows when it should not?

  1. A double check detector assembly Correct answer.
  2. An atmospheric vacuum breaker
  3. A dual check with intermediate vent
  4. A barometric loop

Explanation

A double check detector assembly is a double check valve assembly fitted with a bypass meter and detector that registers unauthorized or leakage flow. It is used on fire protection systems where the hazard is non-health and standing pressure must be maintained. The detection feature allows the purveyor to bill and investigate unaccounted flow.

Question 34Cross-Connection Control Principles and Backflow Theory

An air break differs from an air gap in that an air break:

  1. Provides a completely unobstructed vertical separation open to the atmosphere
  2. Is an approved method of protecting against backpressure
  3. Terminates below the flood level rim of the fixture into which it discharges Correct answer.
  4. Requires the discharge pipe to be sealed to the receptor with a gasketed joint

Explanation

In an air break, the piping terminates below the flood level rim of the receiving fixture but still leaves a separation from the drain or receptor. Because the outlet is below the rim, the arrangement is not accepted as backflow protection for a potable line. An air gap, by contrast, must terminate above the flood level rim and be open to atmosphere.

Question 35Cross-Connection Control Principles and Backflow Theory

Which of the following is classified as a health hazard cross-connection?

  1. A submerged inlet in a tank of clean condenser water
  2. A submerged inlet in a closed heating loop circulating plain water
  3. A submerged inlet in a sump serving a decorative fountain
  4. A submerged inlet in a line carrying a chlorine sanitizing solution Correct answer.

Explanation

A health hazard exists where the contamination could cause illness or death, as with toxic or bacterially unsafe substances. A sanitizing chemical such as chlorine solution qualifies because it is poisonous at the concentrations that could be siphoned back. Non-health hazards create only aesthetic, taste, odor, or discoloration problems.

Question 36Cross-Connection Control Principles and Backflow Theory

Two conditions must be present at the same time for backflow to occur. They are:

  1. A fire flow demand and a dead-end main
  2. A failed check valve and a closed shutoff valve
  3. An air inlet and an atmospheric vent
  4. A cross-connection and a pressure differential favoring reverse flow Correct answer.

Explanation

Backflow requires both an actual or potential cross-connection and a driving force, either backpressure or backsiphonage, that pushes or pulls water the wrong way. Eliminating either condition prevents backflow. This is why control programs stress both removing connections and installing approved protection.

Question 37Cross-Connection Control Principles and Backflow Theory

Under a typical cross-connection control program, a reduced pressure principle assembly after installation must be:

  1. Left completely alone as long as the relief valve continues to stay closed
  2. Tested once every five years by the building owner or manager
  3. Tested only when the water purveyor has reason to suspect a problem
  4. Tested at installation and at least annually thereafter by a certified tester Correct answer.

Explanation

Testable assemblies such as the reduced pressure principle assembly must be tested when installed, after repair or relocation, and at least annually. Testing must be performed by a tester certified by the authority having jurisdiction. The purpose is to verify that both check valves and the relief valve function as designed.

Question 38Cross-Connection Control Principles and Backflow Theory

A water-jet aspirator draws a vacuum on a flask containing a bacterial culture, and the supply is an unprotected hose. Which statement best describes the hazard?

  1. The jet creates a low-pressure zone that can siphon culture into the supply, so an air gap or reduced pressure principle assembly is needed Correct answer.
  2. Reversal can occur only if supply pressure is lost entirely, so a pressure vacuum breaker on the branch is enough
  3. The hazard is limited to backsiphonage and a hose bibb vacuum breaker will control it
  4. The aspirator body acts as a check valve and prevents any reversal of flow

Explanation

Flow through an eductor produces a low-pressure region at the suction port, which can pull flask contents into the water stream and back into the piping. The risk exists whenever the unit is operating, not only when supply pressure is lost. A biological culture is a health hazard, so an air gap or a reduced pressure principle assembly is required.

Question 39Cross-Connection Control Principles and Backflow Theory

Which statement correctly describes a limitation of a barometric loop?

  1. It must be fitted with a relief vent open to atmosphere
  2. It must be tested annually by a certified backflow assembly tester
  3. It cannot be used where the supply pressure exceeds 80 psi
  4. It protects only against backsiphonage, because backpressure can overcome the loop Correct answer.

Explanation

A barometric loop is a fixed piping arrangement rising about 35 feet above the highest downstream outlet. It prevents backsiphonage because a siphon cannot lift water over that height. It offers no protection against backpressure, which can simply push water through the loop.

Question 40Cross-Connection Control Principles and Backflow Theory

For an air gap discharging into a tank, the critical level is:

  1. The lowest point of the water supply outlet Correct answer.
  2. The normal operating water level of the tank
  3. The bottom of the receiving tank
  4. The highest point of the supply piping above the tank

Explanation

The critical level is the lowest point of the supply outlet, and the air gap is measured from that point down to the flood level rim of the receptor. Measuring from the outlet rather than from the pipe centerline or a fitting ensures the separation is never overstated. The required separation is then maintained above the rim.

Question 41Regulations, Codes, and Program Administration

Which code is the primary source of requirements for medical gas and vacuum systems installed in health care facilities in the United States?

  1. NFPA 70, National Electrical Code
  2. NFPA 99, Health Care Facilities Code Correct answer.
  3. NFPA 101, Life Safety Code
  4. NFPA 55, Compressed Gases and Cryogenic Fluids Code

Explanation

NFPA 99 contains the installation, inspection, testing, and maintenance requirements that apply to medical gas and vacuum piping inside a health care facility. NFPA 55 addresses compressed gas storage and handling generally but defers to NFPA 99 for facility distribution systems.

Question 42Regulations, Codes, and Program Administration

Which ASSE professional qualification standard establishes the minimum requirements for medical gas and vacuum system installers?

  1. ASSE 6020
  2. ASSE 6010 Correct answer.
  3. ASSE 6040
  4. ASSE 6030

Explanation

ASSE 6010 is the professional qualification standard for medical gas systems installers, and the code requires installation work to be performed by personnel certified to it. Related standards cover other roles, such as ASSE 6020 for verifiers and ASSE 6030 for maintenance personnel.

Question 43Regulations, Codes, and Program Administration

Final verification of a newly installed medical gas system must be performed by a party certified to which standard?

  1. ASSE 6030
  2. ASSE 6040
  3. ASSE 6010
  4. ASSE 6020 Correct answer.

Explanation

Verification of a new medical gas or vacuum system must be performed by an independent party qualified under ASSE 6020. The verifier inspects the installation and witnesses or conducts the required tests before the system is placed in service.

Question 44Regulations, Codes, and Program Administration

Which gas is used to purge medical gas piping while joints are being brazed?

  1. Compressed shop air
  2. Oil-free dry nitrogen Correct answer.
  3. Carbon dioxide
  4. Argon

Explanation

The code requires a continuous purge of oil-free dry nitrogen inside the piping during brazing to prevent oxidation scale from forming on the interior surface. Scale can flake loose and obstruct flow or contaminate the gas delivered to patients. The purge is maintained until the joint has cooled.

Question 45Regulations, Codes, and Program Administration

Brazers who join medical gas piping must be qualified in accordance with which document?

  1. AWS D1.1, Structural Welding Code - Steel
  2. ASME Boiler and Pressure Vessel Code, Section IX Correct answer.
  3. ASME B31.3, Process Piping
  4. ASME B31.9, Building Services Piping

Explanation

Medical gas brazing must be performed by brazers qualified in accordance with ASME Boiler and Pressure Vessel Code, Section IX, which governs brazing procedure and performance qualification. Holding an installer certification does not by itself qualify a person to braze.

Question 46Regulations, Codes, and Program Administration

Which document primarily governs the storage and handling of compressed gas cylinders at a facility or construction site?

  1. NFPA 25
  2. NFPA 72
  3. NFPA 99
  4. NFPA 55 Correct answer.

Explanation

NFPA 55, Compressed Gases and Cryogenic Fluids Code, sets the requirements for storing, handling, and using compressed gas cylinders, including separation, securing, and signage. NFPA 99 governs the medical gas piping system itself and references NFPA 55 for cylinder storage.

Question 47Regulations, Codes, and Program Administration

In the codes that govern medical gas work, what is the authority having jurisdiction (AHJ)?

  1. The organization or agency responsible for approving an installation Correct answer.
  2. The general contractor that holds the building permit
  3. The manufacturer that supplies the medical gas outlets
  4. The independent verifier retained to test the system

Explanation

The AHJ is the organization, office, or individual responsible for enforcing the code and approving equipment, materials, installations, or procedures. The AHJ may be a municipal inspector, a state agency, or a federal authority such as those overseeing certain health care facilities.

Question 48Regulations, Codes, and Program Administration

An installer must braze medical gas piping inside an occupied hospital wing. Before any torch work begins, the installer must first:

  1. Obtain a hot work permit through the facility's hot work program Correct answer.
  2. Post the brazer qualification records at the job trailer
  3. Notify the local fire department and wait 24 hours before starting
  4. Have the verifier witness the first joint brazed

Explanation

Facilities operate a hot work permit program, typically modeled on NFPA 51B, that requires authorization, fire watch, and removal of combustibles before torch work in occupied buildings. Brazing cannot begin until that permit is issued and its conditions are met.

Question 49Regulations, Codes, and Program Administration

After a new medical gas system passes verification, to whom must the verification report be provided?

  1. The individual brazers who made the joints
  2. Only the installing contractor's insurance carrier
  3. The owner and the authority having jurisdiction Correct answer.
  4. The gas supplier and the pipe manufacturer

Explanation

The verification report documents the inspection and test results and must be furnished to the facility owner and made available to the AHJ. It becomes part of the permanent record of the system and is used by the facility's medical gas program.

Question 50Regulations, Codes, and Program Administration

During installation, an installer finds a structural beam that prevents routing a medical air line as shown on the drawings. The correct action is to:

  1. Obtain approval for the change from the designer of record before proceeding Correct answer.
  2. Reroute the line by the shortest path and note it on the as-built drawings
  3. Ask the facility's maintenance staff to select a new route
  4. Install a smaller line that will fit through the available space

Explanation

The installer is obligated to build to the approved design, and changes affecting routing, sizing, or materials must be approved by the designer of record, and often the AHJ, before work proceeds. Field changes must then be reflected in the recorded documents.