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API SIRE Source Inspector Rotating Equipment Examination Practice Test

Rotating-equipment source inspection involves checking pumps and their components during fabrication, assembly, and testing. Relevant work includes comparing equipment with approved drawings, examining test records, and assessing measurements and assembly conditions. The practice bank covers topics such as pump performance, bearings, vibration, bolted joints, and pressure testing.

Exam overview

Exam providerAmerican Petroleum Institute Individual Certification Programs
Exam codeAPI SIRE
CategoryIndustrial Inspection

About the API SIRE Source Inspector Rotating Equipment Examination Exam

Source inspectors need to connect equipment requirements with observable evidence. For a centrifugal pump, that can mean interpreting factory test results in relation to test speed and the specified performance curve, or recognizing how operation well away from the best efficiency point may affect equipment behavior. Assembly checks call for verifying component identity, orientation, and fit against approved drawings or configurations. Other practical decisions include assessing bearing oil level, identifying soft foot during motor installation, and understanding the purpose of shaft sleeves. Inspection judgment also applies to test setup: removing air before hydrostatic pressurization and selecting a suitably ranged pressure gauge support meaningful, controlled testing. Consistent vibration measurement records and adherence to approved bolting procedures help make inspection findings reproducible and traceable.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

A technician is preparing a vibration measurement on a pump bearing housing. Which sensor orientation is most useful for documenting the measurement consistently?

  1. ARecord the measurement direction relative to the machine, such as horizontal, vertical, or axial
  2. BPlace the sensor at any convenient point and omit the location from the record
  3. CAim the sensor toward the nearest electrical conduit regardless of the bearing
  4. DChange sensor orientation between readings without noting the change
Show answerCorrect answer: A

Vibration readings are meaningful for trending when the location and direction are documented and repeated. Horizontal, vertical, and axial measurements can reveal different machine responses.

Question 2

When reviewing a centrifugal pump’s factory performance-test records, why should the test speed be considered when comparing results with a specified curve?

  1. APump head, capacity, and power vary with rotational speed, so results may need evaluation at the specified speed
  2. BSpeed affects only the color of the test liquid
  3. CA pump curve is independent of rotational speed under all conditions
  4. DTest speed determines the material grade of the impeller
Show answerCorrect answer: A

For a given pump and comparable conditions, performance changes with rotational speed according to pump affinity relationships. Test speed must therefore be considered when assessing results against a specified operating condition.

Question 3

A pump is fitted with a rolling-element bearing housing that uses an oil bath. What is the main purpose of maintaining the specified oil level?

  1. ATo ensure the bearing receives suitable lubrication without excessive churning or heat generation
  2. BTo increase the bearing’s radial load capacity beyond its design rating
  3. CTo prevent the shaft from expanding during operation
  4. DTo eliminate the need for oil condition monitoring
Show answerCorrect answer: A

An oil bath level is selected to provide adequate lubricant access while limiting losses from excessive immersion, churning, and temperature rise. The specified level should be followed rather than adjusted arbitrarily.

Question 4

For a hydrostatic test of a pressure-containing pump component, why is air generally removed from the component before pressurization?

  1. ATo reduce stored energy and improve the safety of the test
  2. BTo increase the component’s electrical conductivity
  3. CTo make the test fluid more compressible
  4. DTo eliminate the need for pressure instrumentation
Show answerCorrect answer: A

Entrapped gas is compressible and can store substantial energy under pressure. Removing air reduces the hazard if a failure occurs and supports a safer hydrostatic test; suitable calibrated pressure instrumentation is still required.

Question 5

What is the principal purpose of applying a controlled torque to bolted equipment joints in accordance with an approved procedure?

  1. ATo achieve the intended bolt preload consistently
  2. BTo make every bolt’s final position visually identical
  3. CTo eliminate the need for clean mating surfaces
  4. DTo compensate for incorrect bolt material
Show answerCorrect answer: A

A controlled tightening procedure is intended to produce an appropriate, repeatable bolt preload for the joint. Torque alone does not correct poor surface condition or incorrect material, and identical visual position is not the objective.

Question 6

Why is a pump’s shaft sleeve sometimes installed over the shaft beneath a mechanical seal or packing?

  1. AIt provides a replaceable wear surface that can protect the shaft from wear or damage
  2. BIt increases the pump’s impeller diameter
  3. CIt eliminates the need to control seal-face condition
  4. DIt converts radial shaft motion into axial motion
Show answerCorrect answer: A

A shaft sleeve can provide a replaceable surface in areas exposed to packing or seal-related wear, helping preserve the shaft. Its use does not replace proper seal installation or operating controls.

Question 7

What is the purpose of checking soft foot during motor installation?

  1. ATo identify a condition in which tightening a mounting foot distorts the machine or changes its position
  2. BTo measure the motor winding insulation resistance
  3. CTo determine whether the pump fluid is corrosive
  4. DTo establish the impeller’s axial blade angle
Show answerCorrect answer: A

Soft foot refers to uneven support beneath a machine foot, which can cause distortion or alignment changes as mounting bolts are tightened. It is distinct from electrical, fluid-compatibility, and impeller measurements.

How to use this practice test

The free practice bank contains 50 questions, with up to 20 randomly selected for a session. Answer questions on rotating-equipment inspection topics, then review the results shown after the session to identify concepts that need closer attention, such as pump testing, assembly checks, or measurement practices.

Preparation tips

  • Compare pump factory test conditions with the specified performance curve, paying attention to test speed before interpreting flow, head, or efficiency results.
  • Practice checking pump assembly against drawings by confirming component identity, orientation, and configuration rather than relying on appearance alone.
  • Review bearing lubrication and motor installation checks, including the purpose of maintaining the specified oil-bath level and detecting soft foot.
  • For pressure-test scenarios, consider why trapped air affects hydrostatic testing and how gauge range influences pressure-reading usefulness.
  • Use a consistent vibration measurement location and sensor orientation, and relate each recorded reading to the equipment condition being assessed.
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