Arizona ROC C-74/CR-74 Boilers, Steamfitting and Process Piping Including Solar Examination

According to ASME Boiler and Pressure Vessel Code (BPVC) Section I, what is the defining operating threshold that classifies a steam boiler as a Power Boiler rather than a Heating Boiler governed by Section IV?

• AOperating steam pressure exceeding 15 psig (103 kPa)
• BOperating steam pressure exceeding 50 psig (345 kPa)
• CWater temperature exceeding 200°F (93°C) regardless of pressure
• DTotal heat input capacity exceeding 200,000 BTU/hr

Under ASME BPVC Section I (PG-67), what is the maximum allowable pressure rise above the Maximum Allowable Working Pressure (MAWP) on a power boiler equipped with a single safety valve during a full-capacity discharge test?

• A6% above MAWP
• B10% above MAWP
• C15% above MAWP
• D3% above MAWP

For a low-pressure hot water heating boiler governed by ASME Section IV (HG-400.2), what is the maximum set pressure permitted for the pressure relief valve?

• A160 psig
• B30 psig
• C15 psig
• D100 psig

Under ASME BPVC Section VIII Division 1 (UG-99), what is the standard minimum hydrostatic test pressure multiplier required for a newly constructed pressure vessel?

• A1.3 times the MAWP multiplied by the stress ratio
• B1.5 times the MAWP multiplied by the stress ratio
• C1.1 times the MAWP multiplied by the stress ratio
• D2.0 times the MAWP multiplied by the stress ratio

What is the minimum pipe size required for the water column connections to a Section I power boiler shell or drum under ASME BPVC PG-60?

• A1 inch (NPS 1)
• B3/4 inch (NPS 3/4)
• C1/2 inch (NPS 1/2)
• D1-1/2 inches (NPS 1-1/2)

Under ASME Section I (PG-59.3), when a power boiler operates at a pressure exceeding 100 psig (690 kPa), how many blowoff valves are required on the bottom blowoff line?

• ATwo slow-opening valves, or one quick-opening and one slow-opening valve in series
• BOne single slow-opening globe valve
• CTwo quick-opening lever valves in series
• DOne check valve and one gate valve

According to the National Board Inspection Code (NBIC) and ASME standards, what is the maximum temperature of blowdown water permitted to discharge directly into a public sewer system without passing through a blowoff vessel?

• A140°F (60°C)
• B180°F (82°C)
• C212°F (100°C)
• D100°F (38°C)

Under ASME Section I PG-61, power boilers having more than how many square feet of water-heating surface must be equipped with at least two independent means of feeding water?

• A500 sq ft (46.5 sq m)
• B100 sq ft (9.3 sq m)
• C1,000 sq ft (92.9 sq m)
• D250 sq ft (23.2 sq m)

When conducting a hydrostatic pressure test on a newly installed ASME Section I power boiler (PG-99), what is the required test pressure relative to the MAWP?

• A1.5 times the MAWP
• B1.25 times the MAWP
• C1.3 times the MAWP
• D2.0 times the MAWP

What is the lowest permissible location for the bottom sight glass nut on a Section IV low-pressure steam heating boiler relative to the lowest safe water level?

• AAt least 1 inch (25 mm) above the lowest safe water level specified by the manufacturer
• BExactly level with the top of the boiler crown sheet
• CAt least 3 inches below the water line
• DAt the exact center of the steam drum

On a power boiler with multiple safety valves, what is the maximum set pressure allowed for the highest-set safety valve under ASME Section I PG-67?

• ANot more than 3% above the MAWP
• BNot more than 10% above the MAWP
• CMust be set exactly at MAWP without exception
• DNot more than 6% above the MAWP

What type of valve arrangement is required between a boiler feed pump discharge and a Section I power boiler drum connection under ASME PG-58?

• AA stop valve placed closest to the boiler shell/drum, with a check valve between the stop…
• BA check valve placed closest to the boiler shell, with a stop valve between the check val…
• CA single pressure-regulating valve without manual shutoff
• DTwo check valves in series with no manual shutoff valve

What is the minimum pressure rating required for the pressure gauge installed on an ASME Section IV low-pressure steam heating boiler operating at 15 psig?

• AScale range of 0 to 30 psig, with 15 psig located at approximately mid-scale
• BScale range of 0 to 15 psig only
• CScale range of 0 to 100 psig
• DScale range of 0 to 200 psig

Under ASME Section VIII Division 1 (UG-116), what code symbol stamp is required on a stamped unfired pressure vessel?

• AU Stamp
• BS Stamp
• CH Stamp
• DPP Stamp

What is the primary function of a continuous surface blowdown (surface blowoff) system in a surface blowdown (surface blowoff) system in a steam boiler?

• ATo continuously remove dissolved solids (TDS), scum, and oil scum from the water surface…
• BTo remove heavy sludge and mud accumulated at the bottom of the mud drum
• CTo rapidly empty the boiler drum during an overpressure emergency
• DTo inject chemical oxygen scavengers into the steam drum

When installing shutoff valves between the boiler shell and a water column on a Section I power boiler (PG-60.1.7), what specific valve requirement must be met?

• AValves must be outside-screw-and-yoke (OS&Y) lever-lifting gate valves or stopcocks with…
• BStandard non-rising stem gate valves without indicators are required
• CSpring-loaded check valves must be installed to prevent backflow
• DGlobe valves with flow direction arrow facing the water column must be used

A power boiler has an MAWP of 200 psig. What is the maximum blowdown (pressure drop before reclosing) permitted for a Section I safety valve set at 200 psig under PG-67?

• A4% of set pressure (8 psi)
• B10% of set pressure (20 psi)
• C15% of set pressure (30 psi)
• D1% of set pressure (2 psi)

Under ASME Section IV, what minimum discharge pipe size is required for the drain or blowdown line on a low-pressure steam boiler water column?

• A3/4 inch (NPS 3/4)
• B1/2 inch (NPS 1/2)
• C1 inch (NPS 1)
• D1-1/4 inches (NPS 1-1/4)

Under ASME CSD-1 (CW-120), automatically fired steam boilers must be equipped with how many low water cutoff (LWCO) devices, and what reset characteristic is required for the secondary device?

• ATwo low water cutoffs; the secondary device must require a manual reset
• BTwo low water cutoffs; both devices must automatically reset when water returns
• COne low water cutoff with automatic reset
• DThree low water cutoffs; all requiring manual reset

Under ASME CSD-1 (CF-300), what is the maximum allowable trial-for-ignition (TFI) time for the main burner flame on a power gas burner rated over 400,000 BTU/hr?

• A4 seconds
• B15 seconds
• C30 seconds
• D60 seconds

Under ASME CSD-1 (CW-310), how must the high-limit pressure control on a steam boiler be connected relative to the operating pressure control?

• AIt must operate independently of the operating control and require a manual reset when tr…
• BIt must be wired in parallel with the operating control to allow automatic recycling
• CIt must share a single pressure sensing siphon tube and mercury switch with the operating…
• DIt must shut down only the draft fan without interrupting fuel supply

What burner fuel valve configuration is required under ASME CSD-1 (CF-180) for gas trains feeding burners rated at 5,000,000 BTU/hr and above?

• ATwo safety shutoff valves in series with an automatic vent valve between them (double blo…
• BA single manual plug valve followed by a pressure regulator
• COne motorized safety shutoff valve with a bypass line
• DTwo check valves in series with a manual gate valve

Under ASME CSD-1 (CG-500), how often must the low water cut-offs and safety limit switches of an automatically fired boiler be tested by a qualified operator or technician?

• ALow water cutoffs tested periodically (daily/weekly flush for float types, monthly for pr…
• BTested once every 5 years during inspector hydrostatic re-certification
• CTested only when burner fails to ignite
• DTested once every 3 years by the boiler manufacturer

What component is used in modern flame safeguard controls to detect the presence of an oil or gas flame using the electrical conductivity of ionized combustion gas?

• AFlame rectification rod (flame rod)
• BCadmium sulfide (Cad cell) photoconductive cell
• CThermocouple millivolt generator
• DBimetallic thermal snap disc

Under ASME CSD-1 (CF-200), what is the minimum required pre-purge volume change for a power gas burner combustion chamber before ignition spark?

• AAt least 4 air changes of the combustion chamber and passes
• BAt least 1 air change of the combustion chamber
• CAt least 10 air changes of the combustion chamber
• DNo pre-purge is required for gas burners under 2,000,000 BTU/hr

On a hot water heating boiler governed by CSD-1 (CW-400), at what setting must the high-limit temperature control be calibrated relative to the maximum allowable water temperature?

• AAt or below the maximum allowable water temperature (250°F for Section IV boilers)
• BAt 10% above the maximum design temperature
• CAt 300°F (149°C) to allow over-firing headroom
• DEqual to the operating control setting

What is the function of a proof-of-closure switch on an automatic fuel safety shutoff valve (SSOV)?

• ATo mechanically verify that the valve disc is fully seated before the flame safeguard all…
• BTo measure fuel gas flow rate into the main burner
• CTo signal when the fuel valve is 50% open during low-fire start
• DTo automatically bypass the low water cutoff during burner start

Under ASME CSD-1, where must the emergency remote shutdown switch (boiler emergency stop / E-stop) for a boiler room be located?

• AJust outside each boiler room exit door
• BDirectly on the front control panel of the burner
• CInside the main electrical distribution panel room
• DInside the boiler furnace observation port enclosure

Under ASME B31.1 (Power Piping), what classification is given to piping that connects the boiler drum to the first blowoff valve or main steam stop valve, and what code stamping applies?

• ABoiler External Piping (BEP); requires ASME Section I code stamping and Form P-4 data rep…
• BNon-Boiler External Piping (NBEP); requires no ASME stamping
• CProcess Industrial Piping; governed exclusively by ASME B31.3
• DBuilding Service Piping; governed by International Mechanical Code

Using the ASME B31.3 straight pipe pressure design equation t = (P * D) / [2 * (S * E + P * Y)], calculate the minimum required design wall thickness (t) for a 6-inch nominal (6.625 in. OD) A106 Grade B carbon steel pipe operating at internal design pressure P = 500 psig and design temperature 400°F. (Allowable stress S = 20,000 psi, joint quality factor E = 1.0, Y = 0.4 coefficient).

• A0.082 inches
• B0.165 inches
• C0.280 inches
• D0.432 inches

Under ASME B31.1 (137.4), what is the minimum hydrostatic test pressure required for non-boiler external power piping?

• ANot less than 1.5 times the internal design pressure
• BNot less than 1.1 times the internal design pressure
• CNot less than 2.0 times the internal design pressure
• DEqual to the operating working pressure

In ASME B31.3 (Process Piping), how is Category D Fluid Service defined?

• ANon-flammable, non-toxic fluid operating at design pressure ≤ 150 psig (1035 kPa) and tem…
• BToxic fluid where single exposure to small amounts causes serious irreversible health dam…
• CHigh pressure fluid service operating above ASME Class 2500 pressure rating
• DSevere cyclic conditions subject to rapid thermal fatigue

When performing a pneumatic pressure test under ASME B31.3 (345.5), what preliminary pressure check must be conducted before raising system pressure to the full test pressure?

• AGradually increase pressure to 25 psig (170 kPa) or 0.5 times test pressure (whichever is…
• BInstantly pressurize to 100% test pressure and hold for 10 minutes
• CPressurize to 1.5 times design pressure with nitrogen
• DFill the entire system with water before adding air pressure

A 200-foot straight run of carbon steel steam piping (coefficient of thermal expansion α = 6.5 × 10^-6 in/in/°F) is installed at 70°F and operates at 470°F. What is the total thermal expansion (growth in inches) of this pipe run?

• A6.24 inches
• B3.12 inches
• C12.48 inches
• D1.56 inches

What type of pipe support hanger is designed to maintain a constant supporting force on a high-temperature steam line throughout its vertical thermal movement?

• AConstant support spring hanger
• BVariable spring hanger
• CRigid clevis hanger
• DRoller chair anchor

Under ASME B31.1 Table 121.5, what is the maximum recommended hanger spacing for a 4-inch nominal horizontal schedule 40 steel pipe carrying water?

• A14 feet (4.3 m)
• B10 feet (3.0 m)
• C17 feet (5.2 m)
• D20 feet (6.1 m)

What is the mill undertolerance typically subtracted from nominal pipe wall thickness during ASME B31.3 process pipe thickness verification?

• A12.5% under nominal thickness
• B5% under nominal thickness
• C20% under nominal thickness
• D0% (no mill undertolerance is permitted)

Which entity must hold an ASME Certificate of Authorization and apply the appropriate ASME Code Stamp to Boiler External Piping (BEP) under B31.1?

• AAn ASME-certified manufacturer or contractor holding an 'S', 'A', or 'PP' stamp
• BAny licensed state plumbing contractor without ASME certification
• CThe municipal building inspection department
• DThe boiler operating engineer

Under ASME B31.3 Chapter VI, what minimum percentage of circumferential butt welds must undergo visual examination (VT) for Normal Fluid Service?

• A100% of all welds
• B5% of all welds
• C20% of all welds
• D50% of all welds

When installing an expansion loop in a steam line, where should pipe alignment guides be placed relative to the expansion loop?

• AThe first guide within 4 pipe diameters of the loop entrance, and the second guide within…
• BDirectly in the center of the expansion loop top leg
• CAt 50-foot fixed intervals regardless of pipe diameter
• DOnly at the main anchor points 100 feet away

What is the maximum allowable test pressure for a pneumatic test under ASME B31.3 (345.5.4)?

• A1.1 times the design pressure
• B1.5 times the design pressure
• C1.3 times the design pressure
• D2.0 times the design pressure

Under ASME B31.1 (122.1.7), what type of reducer fitting must be used on horizontal steam main piping to prevent condensate accumulation?

• AEccentric reducer installed flat-on-bottom (FOB)
• BConcentric reducer centered on the pipe axis
• CEccentric reducer installed flat-on-top (FOT)
• DStandard thread-reduction bushing

Which NDE method under ASME Section V / B31.3 is capable of detecting internal volumetric defects (such as porosity or lack of penetration) throughout the full thickness of a pipe butt weld?

• ARadiographic Testing (RT) or Ultrasonic Testing (UT)
• BLiquid Penetrant Testing (PT)
• CMagnetic Particle Testing (MT)
• DVisual Testing (VT)

What is the minimum socket weld depth requirement for slip-on flanges or socket-weld fittings under ASME B31.1 (127.3)?

• APipe must be inserted to full depth then backed off approximately 1/16 inch (1.5 mm) prio…
• BPipe must be bottomed out hard against the socket shoulder with 0 gap
• CPipe must be inserted half-way into the socket
• DPipe must be backed off 1/2 inch from the socket shoulder

Under ASME B31.3 (304.2.1), what factor Y is specified for ferritic carbon steels operating at design temperatures of 900°F (482°C) or lower?

• A0.4
• B0.7
• C0.5
• D1.0

What is the primary purpose of installing a pipe anchor on a steam distribution line?

• ATo completely fix the pipe in space at that point, preventing axial and lateral displacem…
• BTo allow free axial movement while restraining lateral vibration
• CTo absorb high frequency pressure surges in liquid lines
• DTo insulate the pipe hanger from high temperatures