Nevada C-1C Pipe and Duct Insulation Contractor Examination

What is the primary purpose of insulating hot-water and steam piping under the Nevada C-1C scope?

• ATo reduce heat loss from the fluid to the surrounding space
• BTo increase the pipe's pressure rating
• CTo replace the need for expansion joints
• DTo make steel pipe potable-water certified

What does the R-value of pipe or duct insulation measure?

• AThermal resistance to heat flow
• BFlame-spread index under ASTM E84
• CCompressive strength in pounds per square inch
• DWater-vapor permeance

Under UMC 2018 hydronic rules, insulation on occupant-accessible piping must keep the touchable surface at or below what temperature?

• A100°F (38°C)
• B120°F (49°C)
• C140°F (60°C)
• D180°F (82°C)

Which material is the usual factory-molded covering for heating piping up to about 850°F?

• AFlexible elastomeric foam
• BPreformed fiberglass pipe insulation with an all-service jacket
• CExpanded polystyrene bead board
• DOpen-cell spray polyurethane

On chilled-water piping, where must the vapor retarder be placed?

• AOn the pipe surface under the insulation
• BOn the outside of the insulation, sealed at every joint and penetration
• COnly on the ends of each pipe length
• DVapor retarders are never used on cold piping

What does ASJ stand for on factory-jacketed pipe insulation?

• AAll-service jacket
• BAsbestos seal jacket
• CAluminum steam jacket
• DAcoustic sound jacket

Per UMC 2018 Table E 503.7.3(1), what is the minimum insulation thickness on 3/4-inch heating piping operating at 120°F?

• A0.5 inch
• B1.0 inch
• C1.5 inches
• D2.5 inches

Per UMC 2018 Table E 503.7.3(2), what is the minimum insulation thickness on 1/2-inch chilled-water piping operating at 45°F?

• A0.5 inch
• B1.0 inch
• C1.5 inches
• D2.0 inches

Pipe insulation installed outdoors and exposed to weather must be protected by which of the following?

• AA weather jacket suitable for outdoor service, such as aluminum, sheet metal, or a listed…
• BAn extra layer of unfaced fiberglass only
• CDuct tape wrapped in a spiral
• DNo protection if the ASJ is white

Which insulation is preferred for direct-buried chilled-water piping because it is impermeable and crush-resistant when properly cased?

• AUnjacketed fiberglass wrap
• BOpen-cell spray foam
• CCellular glass (cellular foamglass) in a waterproof, noncrushable casing
• DMineral-wool batts in a cardboard carton

How should pipe insulation be supported at hangers so the advertised thickness and R-value are not lost?

• ARest the insulated pipe directly on a narrow wire hanger so the insulation compresses
• BUse a high-density insert or a saddle wide enough to keep the insulation from crushing
• CLeave a 6-inch gap in the insulation at every hanger
• DHang the pipe from banding wrapped only around the ASJ

Under NAC 624.190, what work does a Nevada C-1C license authorize?

• AThe insulation of pipes, ducts, and related equipment
• BThe installation of potable-water piping and fixtures
• CThe fabrication of fire-sprinkler systems
• DThe installation of boilers and steam generators

Per UMC 2018 Table E 503.7.3(1), what is the minimum insulation thickness on 2-inch hot-water heating pipe operating at 180°F?

• A1.0 inch
• B1.5 inches
• C2.0 inches
• D2.5 inches

Per UMC 2018 Table E 503.7.3(1), what is the minimum insulation thickness on 6-inch heating pipe operating at 220°F?

• A1.5 inches
• B2.0 inches
• C2.5 inches
• D3.0 inches

Per UMC 2018 Table E 503.7.3(1), what is the minimum insulation thickness on 1-inch heating pipe operating at 160°F?

• A1.0 inch
• B1.5 inches
• C2.0 inches
• D2.5 inches

UMC 2018 Table E 503.7.3(1) footnote 4 allows a thickness reduction on direct-buried heating and hot-water piping. What is the lowest thickness that footnote still permits?

• ANo insulation is required on any buried heating pipe
• B0.5 inch
• C1.0 inch
• DThe full table thickness with no reduction

A 1-inch hot-water pipe at 120°F runs in a partition inside a conditioned space. After applying Table E 503.7.3(1) footnote 3, what is the minimum allowed thickness?

• A0 inch (insulation may be omitted)
• B0.5 inch
• C1.0 inch
• D2.0 inches

Per UMC 2018 Table E 503.7.3(2) footnote 3, insulation is not required for which of the following?

• AIndoor 2-inch chilled-water mains at 44°F
• BDirect-buried cooling-system piping
• CRefrigerant suction lines in a mechanical room
• DBrine piping at 30°F on a roof

When the insulation conductivity is outside the range listed in UMC Table E 503.7.3, how is the minimum thickness T found?

• AUse the table thickness with no change
• BT = r{(1 + t/r) raised to the power (K/k), minus 1}
• CT equals the table thickness multiplied by 2
• DT equals the pipe inside diameter

UMC 2018 Table E 503.7.3(1) footnote 2 says the tabulated thicknesses are based on energy efficiency only. What does that imply on a 350°F steam line in a walkway?

• AThe table thickness is always enough for burn protection
• BAdditional thickness is permitted, and often required, so the jacket stays at a safe touc…
• CSteam lines in walkways may be left bare
• DOnly paint is required for personnel protection

A pipe insulation is 1.5 inches thick and has conductivity k = 0.25 Btu·in/(h·ft²·°F). What is its approximate R-value?

• AR-0.38
• BR-4.0
• CR-6.0
• DR-15.0

A pipe has an actual outside diameter of 12 inches and is covered with 2-inch insulation. Using π = 3.14, what is the outer surface area of the insulation on a 20-foot run?

• A62.8 square feet
• B75.4 square feet
• C83.7 square feet
• D100.5 square feet

A pipe has an actual outside diameter of 4 inches and is covered with 1-inch insulation. Using π = 3.14, what is the outer jacket area on a 50-foot run?

• A52.3 square feet
• B62.8 square feet
• C78.5 square feet
• D104.7 square feet

Which product is commonly selected for indoor chilled-water and refrigerant suction lines because it is closed-cell and acts as its own vapor retarder?

• AUnfaced mineral-wool board
• BFlexible elastomeric foam (closed-cell NBR/PVC)
• COpen-cell fiberglass duct liner
• DPerlite loose fill

Why is calcium silicate often used at pipe hangers and on high-temperature steam?

• AIt has high compressive strength and a high service temperature (on the order of 1200°F)
• BIt is a closed-cell vapor retarder for chilled water
• CIt is the only product that meets Table E 503.7.3
• DIt is listed as an outdoor weather jacket

Fittings, valves, and flanges on an insulated hydronic line should be insulated to which thickness?

• AHalf the pipe-insulation thickness
• BThe same thickness as the adjacent straight pipe, with removable covers on components tha…
• CNo insulation; fittings are left bare for access
• DTwice the pipe-insulation thickness on every 90-degree elbow

How should a steam or heating-water valve that needs periodic packing adjustment be insulated?

• ACemented permanently into the straight-run insulation
• BLeft completely bare
• CCovered with a removable, reusable insulation blanket or boxed cover of the specified thi…
• DWrapped with a single layer of aluminum foil

How are the longitudinal lap and butt joints of an ASJ-faced pipe insulation sealed?

• AThey may be left open if the insulation is a tight fit
• BWith the factory self-sealing lap and matching ASJ tape or vapor-barrier mastic on butts,…
• CWith cloth duct tape only
• DBy stapling through the jacket into the pipe

After hydronic piping is insulated, UMC Chapter 12 identification must be repeated at least how often?

• AEvery 5 feet
• BEvery 20 feet, and not less than once per room, visible from the floor
• COnly at the mechanical-room entrance
• DIdentification is not required on insulated pipe

Where insulated hydronic pipe passes through a sleeve in a wall or floor, the insulation should:

• AStop 6 inches short of the sleeve on each side
• BContinue through the sleeve at the specified thickness so there is no bare gap
• CBe stripped off so only the pipe touches the sleeve
• DBe replaced with spray foam of any thickness

A mechanic is ordering 1-inch-thick fiberglass pipe insulation for NPS 2 steel pipe. Why must the insulation be ordered as 2-inch iron-pipe size, not as 2-inch inside diameter?

• ANPS 2 steel pipe has an actual outside diameter of 2.375 inches, so the insulation ID mus…
• BNPS 2 steel pipe has an actual OD of exactly 2.000 inches
• CInsulation is sized to the pipe inside diameter
• DAll pipe insulation is sold only in copper-tube sizes

A common outdoor metal jacket for insulated pipe is:

• A0.016-inch aluminum with a moisture barrier on the inner face, lapped and banded
• BHousehold aluminum foil taped in place
• C15-pound roofing felt only
• DUnpainted kraft paper

Per UMC 2018 Table E 503.7.3(1), what is the minimum insulation thickness on 8-inch steam piping operating at 300°F?

• A2.5 inches
• B3.0 inches
• C4.5 inches
• D5.0 inches

Per UMC 2018 Table E 503.7.3(2), what is the minimum insulation thickness on 10-inch brine piping operating below 40°F?

• A0.5 inch
• B1.0 inch
• C1.5 inches
• D2.5 inches

NPS 4 steel pipe (actual OD 4.500 inches) is insulated with 1.5-inch-thick covering. Using π = 3.14, what is the outer surface area of 80 feet of that insulation?

• A94.2 square feet
• B125.6 square feet
• C157 square feet
• D188.4 square feet

A pipe has an actual outside diameter of 6 inches and is covered with 2-inch insulation. Using π = 3.14, what is the volume of insulation in a 10-foot length?

• A1.75 cubic feet
• B2.62 cubic feet
• C3.49 cubic feet
• D5.23 cubic feet

A specification requires R-8 on a pipe. The product conductivity is k = 0.27 Btu·in/(h·ft²·°F). What installed thickness is required (t = R × k)?

• A1.0 inch
• B1.5 inches
• C2.16 inches
• D8.0 inches

A 3-inch chilled-water main operates at 45°F indoors. Besides the 1.0-inch minimum from Table E 503.7.3(2), what else is required?

• AA continuous vapor retarder or inherent closed-cell seal, because the table thickness is…
• BNothing else; 1.0 inch of any unfaced insulation is enough
• CA steam-rated calcium-silicate cover
• DOmission of insulation because the pipe is indoors

Direct-buried 2-inch heating water at 200°F is allowed a 1-1/2-inch reduction from Table E 503.7.3(1). What thickness must still be installed?

• A0 inch
• B0.5 inch
• C1.0 inch
• D2.0 inches

On high-temperature steam, two-layer pipe insulation is installed so that:

• AAll longitudinal joints line up to make a single easy cut
• BJoints are staggered and each layer is wired or banded so there is no through-gap to the…
• COnly the inner layer is installed; the outer layer is decorative
• DThe inner layer is left 1/2 inch short of fittings

What is the primary purpose of insulating supply and return air ducts?

• ATo reduce heat gain or heat loss and to control condensation
• BTo increase the duct's pressure class
• CTo replace the need to seal joints
• DTo make unlisted flexible duct a fire damper

What is the difference between duct wrap and duct liner?

• AWrap is applied to the outside of the duct; liner is applied to the inside airstream surf…
• BWrap is only for underground duct; liner is only for rooftop duct
• CThey are different names for the same product
• DLiner is a weather jacket; wrap is a firestop

FSK facing on duct wrap is primarily which of the following?

• AA foil-scrim-kraft vapor retarder and finish jacket
• BA structural duct reinforcement
• CA fire damper blade
• DA hangar saddle

When should metal duct joints be sealed relative to installing exterior duct wrap?

• ASeal joints and seams with listed mastic or UL 181 tape first, then apply wrap
• BWrap first, then hope the wrap seals the leaks
• CNever seal metal ducts that will be wrapped
• DSeal only after the building is occupied

UMC 2018 Section 604.1 requires factory-made air ducts and exterior duct insulations to be legibly printed with which information?

• AManufacturer name, R-value at installed thickness, and flame-spread and smoke-developed i…
• BOnly the contractor's license number
• COnly the duct pressure class
• DThe building owner's name