API SIRE Source Inspector Rotating Equipment

Under API Standard 610, what does the abbreviation 'OH2' designate?

• AAn overhung, single-stage, foot-mounted pump
• BAn overhung, single-stage, centerline-mounted process pump
• CA between-bearings, two-stage horizontal pump
• DA vertically suspended single-casing pump

An inspector is verifying a centrifugal pump casing hydrostatic test per API 610. What is the minimum hydrostatic test pressure relative to the maximum allowable working pressure (MAWP) at the pumping temperature?

• A1.0 times MAWP
• B1.1 times MAWP
• C1.5 times MAWP
• D2.0 times MAWP

Per API 610, what is the minimum hold time at full hydrostatic test pressure for a pump casing during the inspection witness?

• A5 minutes
• B10 minutes
• C30 minutes
• D60 minutes

During an API 610 performance test, which test point is normally used to establish the guaranteed performance of the pump?

• AShut-off (zero flow) head
• BRunout flow at the right end of the curve
• CThe rated point shown on the pump data sheet
• DBest efficiency point of the next-larger pump in the series

Per API 610, what is the standard tolerance band on rated total head measured during a centrifugal pump performance test for a pump in the typical mid-size range?

• APlus or minus 1 percent
• BPlus or minus 3 percent
• CPlus or minus 5 percent
• DPlus or minus 10 percent

What is the primary purpose of an NPSH test on a centrifugal pump per API 610?

• AVerify the casing can hold maximum allowable working pressure
• BVerify that the pump operates without cavitation at the specified NPSH available
• CVerify the bearing temperature rise at full load
• DVerify the coupling alignment tolerance

An API 610 pump has a measured impeller balance grade of G6.3. Which statement is correct?

• AG6.3 satisfies the API 610 single-plane balance requirement, which is generally G1.0 or b…
• BG6.3 is the API 610 minimum requirement for rotor balance
• CG6.3 fails the API 610 balance requirement, which is generally G1.0 or better
• DBalance grade is not addressed by API 610

Which API 610 designation describes a vertically suspended, single-casing, diffuser-type pump with discharge through the column?

• AOH3
• BBB3
• CVS1
• DVS6

Per API 610, what is the maximum allowable peak-to-peak shaft vibration at the rated condition during a pump performance test for many process pumps in this range?

• AApproximately 0.5 mils peak-to-peak
• BApproximately 2.0 mils peak-to-peak
• CApproximately 5.0 mils peak-to-peak
• DApproximately 10 mils peak-to-peak

An API 610 pump baseplate is being inspected on a surface plate. What is the typical maximum out-of-flatness specified for the mounting surfaces that interface with the pump and driver feet?

• AApproximately 0.05 mm (0.002 in) per meter
• BApproximately 0.5 mm (0.020 in) per meter
• CApproximately 5 mm (0.200 in) per meter
• DFlatness is not specified by API 610

Which inspection activity is most directly associated with API 610 Section 8 (testing and inspection)?

• ASelecting the impeller material
• BWitnessing the casing hydrostatic, performance, and NPSH tests
• CSetting the seal flush plan during commissioning
• DSelecting a coupling guard material

A pump data sheet specifies a mechanical seal arrangement coded as API Plan 53B. What does this plan describe?

• AA single mechanical seal with API Plan 11 flush only
• BA dual pressurized seal with a bladder-type accumulator providing barrier fluid
• CA quench-and-drain arrangement with steam
• DAn external flush from a remote source

Per API 610, what is the typical material class requirement for a pump in lethal hydrocarbon service such as wet H2S?

• AClass I-1 with cast iron casing
• BA material class that meets NACE MR0175/ISO 15156 hardness limits
• CAlways 12% chrome internals only
• DMaterial is selected by the manufacturer without input from the buyer

What is the inspector's first action when a pump casing fails the hydrostatic test by leaking through the parent metal of a casting?

• AApprove a quick weld repair without notification
• BPlace a nonconformance, hold further work, and review the proposed repair method with the…
• CRe-test at a lower pressure to obtain a passing result
• DReject the pump permanently and stop the project

On an API 610 BB3 pump, which feature most distinguishes it from a BB1 pump?

• ABB3 is a vertically suspended pump
• BBB3 is a multistage axially split pump with multiple impellers
• CBB3 is an overhung single-stage pump
• DBB3 uses no bearings

Per API 610, which flange rating is typically the minimum acceptable for hydrocarbon pump suction and discharge connections?

• AASME B16.5 Class 150 only
• BASME B16.5 Class 300 (or higher, as required by service)
• CASME B16.5 Class 75
• DFlat-face threaded fittings

When verifying that a pump impeller meets the API 610 dynamic balance requirement, which document should the inspector request?

• AThe hydrostatic test report only
• BA balance machine printout or certified balance report showing the residual unbalance
• CA vibration spectrum from the customer site
• DA material test report for the casing

Per API 610, when must a mechanical running test (string test of the pump itself, not the train) be performed?

• AOn every pump under all conditions
• BOnly when specified by the purchaser on the data sheet or required for certain configurat…
• COnly on vertical pumps
• DMechanical running tests are not permitted by API 610

During pump alignment at the manufacturer's shop, the inspector measures soft foot at one motor foot of 0.020 inch. What is the typical acceptable maximum soft foot value before correction is required?

• A0.100 in (2.5 mm)
• B0.002 in (0.05 mm)
• C0.250 in (6.3 mm)
• DSoft foot is irrelevant before shipping

A pump rotor is being inspected by the source inspector. Which document confirms the chemistry and mechanical properties of the rotor forging?

• APump general arrangement drawing
• BMaterial test report (MTR) for the forging
• CMechanical seal flush plan diagram
• DHydrostatic test report

Which API 610 pump configuration is normally specified for high-temperature hot-oil heavy-duty refinery service?

• AOH1 foot-mounted
• BOH2 centerline-mounted
• CANSI B73.1 end-suction
• DSubmersible sump pump

Per API 610, what is the typical minimum specified gasket material requirement for casing joints in hydrocarbon service?

• ARubber sheet gasket
• BSpiral-wound stainless or equivalent metal gasket suited to the temperature
• CCompressed asbestos
• DPlain cork gasket

During pump performance testing, the inspector observes that the measured rated flow is 5% below the data sheet rated flow, while head and power meet tolerance. What is the appropriate action?

• AAccept because head and power are within tolerance
• BIssue a nonconformance because rated flow is outside the typical plus/minus tolerance
• CRecalibrate the data sheet to match the measured flow
• DRe-test at a higher impeller trim

On an API 610 vertical pump, which suction-related parameter must be verified by the source inspector in addition to the data sheet NPSHr?

• AFirst-stage submergence requirement
• BDischarge piping support spacing
• CDriver coupling guard color
• DOperator training certificates

Which document directly drives the source inspector's witness and hold points at a pump manufacturer's shop?

• AThe owner's CMMS work order
• BThe approved inspection and test plan (ITP)
• CThe plant operating procedure
• DThe freight forwarder's bill of lading

An ITP lists a casing hydrostatic test as a 'hold point' (H) for the source inspector. What does that mean for the manufacturer?

• AThe manufacturer may perform and ship the casing before the inspector reviews the report
• BThe manufacturer must stop and not proceed past that activity without the inspector physi…
• CThe manufacturer may proceed once an internal inspector has signed
• DHold points apply only at the end of the job

API 617 covers which equipment?

• AReciprocating compressors and integrally geared compressors only
• BAxial and centrifugal compressors and expanders for the petroleum, chemical, and gas serv…
• CCentrifugal pumps used in cooling-water service
• DSteam-turbine drivers below 1000 kW only

Per API 617, a centrifugal compressor mechanical run test (MRT) must be conducted for what minimum duration at the maximum continuous speed (MCS)?

• A30 minutes
• B1 hour
• C4 hours
• D24 hours

During an API 617 mechanical run test, the inspector must verify that the compressor is operated at what additional speed condition beyond the 4-hour MCS run?

• AAt 50% of MCS for 1 hour
• BAt trip speed (typically 110% of MCS) for at least 15 minutes
• CAt zero speed with the lube system off
• DAt 200% of MCS for 5 minutes

Per API 617, what is the basic peak-to-peak shaft vibration limit (Av) during the mechanical run test, measured at the bearing housing in mils?

• AAv = 25,000 / N (rpm) with a maximum of 1.0 mil
• BAv = 12,000 / N (rpm) with a maximum of about 1.0 mil at high speeds
• CAv = 50,000 / N (rpm) with no upper limit
• DAv = 100 mils peak-to-peak regardless of speed

Per API 617, the casing of a centrifugal compressor must be hydrostatically tested at a minimum of:

• A1.0 times the maximum allowable working pressure
• B1.25 times the maximum allowable working pressure
• C1.5 times the maximum allowable working pressure
• D2.0 times the maximum allowable working pressure

Per API 617, the gas leakage test (helium leak test or pressurized inert-gas test) on a barrel compressor casing is normally conducted at what pressure?

• A1.5 times MAWP
• BApproximately MAWP
• CTwice the design vibration limit
• DHydrostatic test pressure

An API 617 rotor must be dynamically balanced to what grade?

• AISO 1940-1 Grade G6.3 or coarser
• BISO 1940-1 Grade G2.5 or coarser
• CISO 1940-1 Grade G1.0 or finer
• DISO 1940-1 Grade G16 or coarser

Which of the following is NOT typically required during an API 617 mechanical run test?

• AContinuous monitoring of vibration at each bearing
• BRecording of bearing-metal temperatures
• CProcess gas performance measurement at design molecular weight
• DVerification of lube-oil pressure and temperature

Per API 617, when is a full-load full-pressure full-speed (FLFPFS) test required?

• AOn every compressor as a standard test
• BOnly when specified by the purchaser, typically for critical compressors
• COnly on reciprocating compressors
• DOnly when the casing fails the hydrostatic test

Per API 617, which standard is referenced for the performance test method on centrifugal compressors?

• AASME PTC 10
• BASME PTC 22
• CASME B31.3
• DAPI RP 686

An API 617 compressor train undergoes a lateral rotordynamic analysis. What does the source inspector specifically look for in the analysis report?

• ACasing wall thickness margin
• BFirst and second critical speeds with adequate separation margin from operating speed ran…
• CLube oil viscosity grade
• DCoupling guard ventilation area

A centrifugal compressor uses radial tilting-pad journal bearings. Which inspection check is most appropriate at the manufacturer's shop?

• AVerify only the bearing housing paint
• BVerify pad clearance, preload, and oil supply orifices against the bearing assembly drawi…
• CVerify only the bolt torque on the casing
• DVerify the impeller blade angle

Per API 617, what is the standard configuration of dry gas seals on a centrifugal compressor in hydrocarbon service?

• ASingle dry gas seal with atmospheric vent
• BTandem dry gas seal with intermediate vent
• CWet liquid seal only
• DCarbon ring seal only

API 618 covers which equipment?

• ACentrifugal pumps for general service
• BReciprocating compressors for petroleum, chemical, and gas industry services
• CAxial gas turbines for power generation
• DSteam turbines used as pump drivers

Per API 618, the mechanical run test for a reciprocating compressor must be conducted for what minimum continuous duration?

• A1 hour
• B4 hours minimum at rated speed with full load
• C30 minutes only
• D24 hours minimum

Per API 618, what pulsation and vibration control study is typically required for a critical reciprocating compressor?

• ANo study is required
• BAn API 618 Design Approach 3 (M3) acoustic and mechanical analysis
• COnly a hydrostatic test of the cylinder
• DOnly a tensile test on the connecting rod

An inspector is reviewing the API 618 reciprocating compressor cylinder hydrostatic test. The test pressure must be at least:

• A1.0 times the maximum allowable working pressure
• B1.25 times the maximum allowable working pressure
• C1.5 times the maximum allowable working pressure
• D0.8 times the maximum allowable working pressure

Which component is unique to an API 618 reciprocating compressor and is NOT found on an API 617 centrifugal compressor?

• ASuction and discharge cylinder valves
• BTilting-pad journal bearings
• CDry gas seal cartridge
• DInlet diaphragm volute

Per API 618, which packing arrangement is typical for the rod packing of a high-pressure hydrocarbon reciprocating compressor?

• ASingle carbon ring set with no cooling
• BMultiple-ring teflon-filled or filled-PEEK packing rings with cooling oil and a distance…
• CRubber lip seal only
• DSpring-loaded mechanical seal as on a centrifugal pump

Per API 618, what crankshaft inspection is typically required before assembly into the compressor frame?

• AVisual inspection only
• BMagnetic particle examination (MT) of journals and fillets and dimensional verification
• CHydrostatic test of the crankshaft
• DRadiographic test of the entire crankshaft

Which standard governs the design of steam turbines used as drivers for refinery and petrochemical pumps and compressors?

• AAPI Std 611 (general-purpose steam turbines) and API Std 612 (special-purpose steam turbi…
• BAPI 510 only
• CASME B31.3 only
• DAPI 653 only